Abstract: An electrolyte for a lithium secondary battery is provided. The electrolyte improves battery safety, high temperature storage characteristics, and electrochemical properties of lithium batteries. The electrolyte comprises at least one lithium salt and a non-aqueous organic solvent comprising a cyclic carbonate and a lactone-based compound. The lactone based compound comprises substituents selected from the group consisting of alkyl groups, alkenyl groups, alkynyl groups, aryl groups, and combinations thereof. A lithium battery is also provided, which comprises a negative electrode capable of intercalating/deintercalating lithium, a positive electrode capable of intercalating/deintercalating lithium, and an inventive electrolyte.

Abstract: The present invention relates to additives for electrolytes of lithium ion secondary batteries that include one or more of the following: 1,3-propane sultone, succinic anhydride; ethenyl sulfonyl benzene, and halobenzene. It can also include biphenyl, cyclohexylbenzene; and vinylene carbonate. The weight of said 1,3-propane sultone is between 0.5 wt. % and 96.4 wt. %, said succinic anhydride is between 0.5 wt. % and 96.4 wt. %; said ethenyl sulfonyl benzene is between 0.5 wt. % and 95.2 wt. %; and said halobenzene is between 0.5 wt. % and 95.2 wt. % of the weight of the additive. Batteries with electrolytes containing said additives have improved over-charge characteristics and low temperature properties, and reduced gas generation during charging and discharging.

Abstract: A nonaqueous electrolyte battery includes a negative electrode including a current collector and a negative electrode active material having a Li ion insertion potential not lower than 0.4V (vs. Li/Li+). The negative electrode has a porous structure. A pore diameter distribution of the negative electrode as determined by a mercury porosimetry, which includes a first peak having a mode diameter of 0.01 to 0.2 ?m, and a second peak having a mode diameter of 0.003 to 0.02 ?m. A volume of pores having a diameter of 0.01 to 0.2 ?m as determined by the mercury porosimetry is 0.05 to 0.5 mL per gram of the negative electrode excluding the weight of the current collector. A volume of pores having a diameter of 0.003 to 0.02 ?m as determined by the mercury porosimetry is 0.0001 to 0.02 mL per gram of the negative electrode excluding the weight of the current collector.

Abstract: A non-aqueous secondary battery contains a positive electrode, a negative electrode, a separator and a non-aqueous electrolytic solution. The positive electrode contains a layered structure lithium-containing compound oxide, or a spinel lithium-containing compound oxide containing manganese as an active material. The non-aqueous electrolytic solution contains at least one additive selected from a sulfonic acid anhydride, a sulfonate ester derivative, a cyclic sulfate derivative and a cyclic sulfonate ester derivative, and a vinylene carbonate or a derivative of the vinylene carbonate.

Abstract: An electrolytic solution capable of inhibiting self-discharge even under the high temperatures and a battery using the electrolytic solution are provided. A spirally wound electrode body in which a cathode and an anode are wound with a separator in between and spirally wound is included inside the battery can. An electrolytic solution is impregnated in the separator. The electrolytic solution contains ethylene sulfite, vinylene carbonate, LiPF6, and a light metal salt such as lithium difluoro[oxalato-O,O?]borate in a given range. Thereby, the self-discharge can be inhibited even under the high temperatures.

Abstract: Disclosed is an electrolyte for batteries, which comprises: (a) an electrolyte salt; (b) an electrolyte solvent; and (c) a sulfonate-based compound containing at least one electron withdrawing group (EWG) selected from the group consisting of a cyano group (—CN), an isocyanate group (—NCO), a thiocyanate group (—SCN) and an isothiocyanate group (—NCS). An electrode comprising the sulfonate-based compound or a chemical reaction product thereof, partially or totally formed on the surface thereof, and an electrochemical device comprising the electrolyte and/or the electrode are also disclosed. The electrochemical device using the sulfonate-based compound containing a cyano group, an isocyanate group, a thiocyanate group and/or an isothiocyanate group as an additive for electrolytes can provide significantly improved high-temperature lifespan characteristics.

Abstract: A lithium secondary battery has an anode, a cathode, a separator between the anode and the cathode and a non-aqueous electrolyte. The non-aqueous electrolyte includes a lithium salt; and a non-linear carbonate-based mixed organic solvent in which (a) a cyclic carbonate compound, and (b) a propionate-based compound are mixed at a volume ratio (a:b) in the range from about 10:90 to about 70:30. The cathode has a current density in the range from about 3.5 to about 5.5 mAh/cm2 and a porosity in the range from about 18 to about 35%. This battery may be manufactured as a high-loading lithium secondary battery.

Abstract: A lithium secondary battery is intended to suppress deterioration upon storage at high temperature of 50° C. or higher without deteriorating the output characteristics at a room temperature. The battery includes a positive electrode capable of occluding and releasing lithium ions, a negative electrode capable of occluding and releasing lithium ions, a separator disposed between the positive electrode and the negative electrode and an electrolyte, in which the electrolyte contains a compound represented by formula (1) (R?O)nSiR4-n??(Formula 1) where R? represents an alkyl group, R is selected from hydrogen, an alkyl group, an alicyclic group, and an aryl group, each of R? and R may be identical or different from each other, the alkyl group has a straight or branched chain having fewer than 10 carbon atoms, and n is an integer of 1 to 3, and a compound having a polymerizable group in the molecule.

Abstract: A lithium secondary battery is intended to suppress deterioration upon storage at high temperature of 50° C. or higher without deteriorating the output characteristics at a room temperature. The battery includes a positive electrode capable of occluding and releasing lithium ions, a negative electrode capable of occluding and releasing lithium ions, a separator disposed between the positive electrode and the negative electrode, and an electrolyte. The electrolyte contains a compound having a double bond in the molecule and a compound having a plurality of polymerizable functional groups in the molecule, and the electrolyte contains a compound represented by formula (4): (in which Z1 and Z2 each represent any one of an allyl group, a methallyl group, a vinyl group, an acryl group, and a methacryl group).

Abstract: A nonaqueous electrolyte solution in which an electrolyte salt is dissolved in an organic solvent includes, includes at least one or more compounds selected from the silicon compounds represented by general formula (1), (2), or (3) below: (In the formulae, each of R1, R2, and R3 independently represents a C1-8 alkyl, C2-8 alkenyl, C2-8 alkynyl, or C6-8 aryl group; R4 represents a C1-8 alkylene, C2-8 alkenylene, C2-8 alkynylene, or C6-8 arylene group; and n represents 1 or 2. When n is 1, X represents a fluorine atom, trifluoromethyl group, C1-8 alkoxy group, C2-8 alkenyloxy group, C6-8 aryloxy group, or C2-8 acyloxy group, C1-8 sulfonyloxy group, isocyanato group, isothiocyanato group, or cyano group. When n is 2, X represents a C1-8 alkylene group, C1-8 alkylenedioxy group, C2-8 alkenylene group, C2-8 alkenylenedioxy group, C2-8 alkynylene group, C2-8 alkynylenedioxy group, C6-8 arylene group, C6-8 arylenedioxy group, C2-8 diacyloxy group, oxygen atom, or direct bond.

Abstract: Disclosed are a non-aqueous electrolyte comprising a lithium salt and a solvent, the electrolyte containing, based on the weight of the electrolyte, 1-10 wt % of a compound of Formula 1 or its decomposition product, and 1-40 wt % of an aliphatic mono-nitrile compound, as well as an electrochemical device comprising the non-aqueous electrolyte. Also disclosed is an electrochemical device comprising: a cathode having a complex formed between a surface of a cathode active material and an aliphatic mono-nitrile compound; and a non-aqueous electrolyte containing 1-10 wt % of a compound of Formula 1 or its decomposition product based on the weight of the electrolyte. The electrochemical device has an excellent low-temperature battery performance and an excellent high-temperature safety, by a synergic effect, and also can provide excellent.

Abstract: To provide a novel pentafluorophenyloxy compound, a method for producing same, a nonaqueous electrolyte solution capable of forming a lithium secondary battery having excellent battery characteristics such as electrical capacity, cycling property and storage property, and a lithium secondary battery. A pentafluorophenyloxy compound represented by the general formula (I) shown below, a method for producing same, a nonaqueous electrolyte solution containing same and a lithium secondary battery: wherein R1 represents a —COCO— group, a S?O group or a S(?O)2 group, R2 represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group or an aralkyl group with the proviso that at least one of the hydrogen atoms of R2 may be each substituted with a halogen atom and that R2 does not represent an aryl group when R1 represents a —COCO— group.

Abstract: The present invention provides a lithium secondary battery which is improved in cycle characteristics and storage stability at an elevated temperature as well as protection from overcharge. In the battery, generation of a gas is also inhibited to prevent the battery from expansion. A non-aqueous electrolytic solution for the lithium secondary battery has an electrolyte in a non-aqueous solvent. The non-aqueous solvent is composed of a cyclic carbonate compound, a linear carbonate compound and a cyclohexylbenzene compound having a benzene ring to which one or two halogen atoms are attached. A volume ratio of the cyclic carbonate compound and the linear carbonate compound in the non-aqueous solvent is in the range of 20:80 to 40:60, or the non-aqueous solvent further contains a small amount of a branched alkylbenzene compound.

Abstract: An electrolyte composition includes (a) a solvent composition including at least one hydrofluoroether compound, the hydrofluoroether compound including two terminal fluoroalkyl groups and an intervening substituted or unsubstituted oxymethylene group, each of the fluoroalkyl groups including only one hydrogen atom and, optionally, at least one catenated (that is, in-chain) heteroatom, with the proviso that, when the oxymethylene group is unsubstituted, at least one of the terminal fluoroalkyl groups is branched and/or includes at least one catenated heteroatom; and (b) at least one electrolyte salt.

Abstract: Disclosed herewith are an additive mixture for the electrolyte of lithium ion secondary batteries and electrolyte of lithium ion secondary batteries comprising the said additive mixture. The additive mixture comprises biphenyl based compound 0.5-95.4 wt %, cyclohexyl benzene based compound 0.1-93.8 wt %, vinylene carbonate 0.4-93.2 wt %, t-alkyl benzene based compound 0.5-96.5 wt %, and phenyl vinyl sulfone 0.5-95.8% based on total weight of the additive mixture.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode; a negative electrode; and a nonaqueous electrolyte, wherein an open circuit voltage in a completely charged state per pair of a positive electrode and a negative electrode is from 4.25 to 6.

Abstract: The invention provides a lithium secondary battery which is excellent in long-term cycle property and in battery characteristics, such as electric capacity and storage property, and a nonaqueous electrolytic solution usable for such a lithium secondary battery. The present invention relates to a lithium secondary battery including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution containing an electrolyte salt dissolved in a nonaqueous solvent, characterized in that the positive electrode is made of a material including a lithium compound oxide, in that the negative electrode is made of a material including graphite, and in that the nonaqueous electrolytic solution contains dialkyl oxalate and further contains vinylene carbonate and/or 1,3-propanesultone, and a nonaqueous electrolytic solution for use in such a battery.

Abstract: An organic electrolytic solution and a lithium battery employing the same are provided. The organic electrolytic solution includes: a lithium salt; an organic solvent containing a high dielectric constant solvent and a low boiling point solvent; and an acetate derivative including two or more substituted silyl groups as an additive. The organic electrolytic solution and the lithium battery employing the same relatively suppress a reduction decomposition of a polar solvent and decrease irreversible capacity in the first cycle. Thus, the charge/discharge efficiency, lifespan, and reliability of the battery can be improved.

Abstract: A battery capable of improving cycle characteristics is provided. A spirally wound electrode body in which a cathode and an anode are wound with a separator in between is included. An electrolytic solution in which an electrolyte salt is dissolved in a solvent is impregnated in the separator. The electrolytic solution contains a cyclic ester carbonate derivative having halogen atom such as 4-fluoro-1,3-dioxolan-2-one and a light metal salt such as difluoro[oxolate-O,O?]lithium borate, tetrafluoro[oxolate-O,O?]lithium phosphate, and difluoro bis[oxolate-O,O?]lithium phosphate.

Abstract: A method of a reducing impurities in an electrolyte includes contacting one or more components of an electrolyte with a zeolite. The method also includes activating one or more anode and one or more cathodes with the electrolyte. Contacting the one or more components with the zeolite can include contacting the electrolyte with the zeolite. In some instances, the method includes preparing the electrolyte after contacting the one or more components of the electrolyte with the zeolite.

Abstract: A nonaqueous electrolyte battery includes: a cathode using a composite compound of lithium and transition metals as a positive active material; an anode using a negative active material capable of being doped with and doped from lithium; and a nonaqueous electrolyte interposed between the cathode and the anode. The nonaqueous electrolyte is obtained by dissolving LiMFm (M is an element selected from As, B, P and Sb, and m is an integer located within a range of 4 to 6.) and LiCnF2n+1 SO3 or LiN(CnF2n+1SO2)2 in a nonaqueous solvent including cyclic carbonate or non cyclic carbonate and having unsaturated carbonate added within a range of 0.1 volume % or more and 5 volume % or less, and the concentration of LiCnF2n+1SO3 or LiN(CnF2n+1SO2)2 is located within a range of 1 wt % or more and lower than 10 wt %. Thus, a self-discharge is suppressed and a storage property is improved.

Abstract: The nonaqueous electrolyte secondary battery uses a positive electrode active material which is a mixture of large particle diameter-positive electrode active material particles having a central particle diameter D50 of 15 to 30 ?m and small particle diameter-positive electrode active material particles having a central particle diameter D50 of 1 to 8 ?m, in which the particle size distribution has a peak having a relative particle amount of 5% or more in each of a particle diameter range of 15 to 30 ?m and a particle diameter range of 1 to 8 ?m, and the nonaqueous electrolyte contains 1,3-dioxane, a vinylene carbonate compound, and at least one type of aromatic compound selected from a cycloalkylbenzene compound and a compound having a quaternary carbon adjacent to a benzene ring, thus having high safety when overcharged, a large initial capacity and excellent charging-discharging cycle characteristics and generating less gas.

Abstract: The object is to provide a nonaqueous-electrolyte battery having high charge/discharge efficiency and excellent high-rate performance. This subject is accomplished by using a nonaqueous electrolyte which comprises an organic solvent and a lithium salt dissolved therein and is characterized by containing at least one quaternary ammonium salt in an amount of 0.06 mol/L or larger and 0.5 mol/L or smaller. This effect is thought to be attributable to the following mechanism: in a relatively early stage (stage in which the negative-electrode potential is relatively noble) in a first charge step, a satisfactory protective coating film is formed on the negative electrode by the action of the quaternary ammonium salt and, hence, the organic solvent employed in the nonaqueous electrolyte is inhibited from decomposing.

Abstract: The present invention provides a nonaqueous electrolytic solution exhibiting excellent battery characteristics such as electrical capacity, cycle property and storage property and capable of maintaining the battery characteristics for a long tire, and a lithium secondary battery using the nonaqueous electrolytic solution. A nonaqueous electrolytic solution for a lithium secondary battery, in which an electrolyte salt is dissolved in a nonaqueous solvent, containing 0.1 to 10% by weight of an ethylene carbonate derivative represented by the general formula (I) shown below, and 0.

Abstract: A nonaqueous electrolyte secondary battery 10 according to an embodiment of the invention includes a positive electrode 11, a negative electrode 12, a separator 13 and a nonaqueous electrolyte liquid in which not only the positive electrode 11 contains a positive electrode active material charged at or higher than 4.3 V based on lithium and a halogenated cyclic carbonate is added in the nonaqueous electrolyte liquid, but also an inorganic insulating material particle layer is formed on the surface of at least either of the positive electrode 11, the negative electrode 12 and the separator 13. By employing such a constitution in the present invention, a nonaqueous electrolyte secondary battery using a positive electrode charged at a high electric potential of 4.3 V or more based on lithium in which the amount of a generated gas is small even when the battery is overcharged at higher temperatures, and the impact safety and reliability thereof are high, can be provided.

Abstract: An electrolyte for a lithium secondary battery includes lithium salts, a non-aqueous organic solvent, and additive compounds, which initiates decomposition at 4V to 5V and show a constant current maintenance plateau region of more than or equal to 0.5V at measurement of LSV (linear sweep voltammetry). The additive compounds added to the electrolyte of the present invention decompose earlier than the organic solvent to form a conductive polymer layer on the surface of a positive electrode by increased electrochemical energy and heat at overcharge. The conductive polymer layer prevents decomposition of the organic solvent. Accordingly, the electrolyte inhibits gas generation caused by decomposition of the organic solvent during high temperature storage, and also improves safety of the battery during overcharge.

Abstract: A non-aqueous solvent is provided that includes ethylene carbonate in a range from 5% or more to less than 60%, propylene carbonate of 40% or less, and diethyl carbonate of 40% or more, as mass ratios. The non-aqueous electrolyte compositions are formed by further adding an electrolytic salt and, if necessary, unsaturated cyclic carbonic ester and a high molecular compound into the non-aqueous solvent. A non-aqueous electrolyte secondary battery is formed by using the non-aqueous electrolyte compositions.

Abstract: Disclosed is an electrolyte for a rechargeable lithium battery including: a first additive having an oxidation potential of 4.1 to 4.6V; a second additive having an oxidation potential of 4.4 to 5.0V; a non-aqueous organic solvent; and a lithium salt.

Abstract: A non-aqueous electrolytic solution secondary battery includes a positive electrode containing, as a positive electrode active material, a compound represented by the following general formula, LixFe1-yMyPO4, wherein M is at least one member selected from the group consisting of Co, Ni, Cu, Zn, Al, Sn, B, Ga, Cr, V, Ti, Mg, Ca and Sr; 0.9<x<1.2; and 0?y<0.3; a negative electrode containing a lithium metal, a lithium alloy or a material capable of doping and dedoping lithium; and a non-aqueous electrolytic solution, the non-aqueous electrolytic solution containing a fluorinated ethylene carbonate FEC.

Abstract: Disclosed is an electrolyte for a rechargeable lithium battery including an additive for overcharge inhibition comprising a compound represented by formula 1; a lithium salt; and a non-aqueous organic solvent: where R1, R2 and R3 are the same or independently selected from H, CH3, C2H5, CH?CH2, CH?CHCH3, or a functional group with N, P, or S.

Abstract: A nonaqueous secondary battery having a negative electrode containing a silicon active material and a nonaqueous solvent containing a fluorine-containing solvent. The active material layer has a fluorine content of 5 to 30 wt % based on the silicon content after at least 100 charge/discharge cycles at a rate of 50% or more of the battery's capacity. The battery is suitably produced by a method including applying a slurry containing silicon active material particles to a current collector, electroplating the resulting coating layer using a plating bath at a pH higher than 7 to coat at least part of the surface of the particles with copper, acid washing the coating layer to make a negative electrode, assembling the negative electrode together with a positive electrode, a separator, and a nonaqueous electrolyte containing a fluorine-containing solvent into a nonaqueous secondary battery, and subjecting the battery to a first charge operation at a low rate of 0.005 to 0.03 C.

Abstract: Disclosed is a lithium secondary battery which is excellent in battery characteristics such as long-term cycle characteristics, capacity and shelf life characteristics. Also disclosed is a nonaqueous electrolyte solution which can be used for such a lithium secondary battery. Specifically disclosed is a nonaqueous electrolyte solution for lithium secondary batteries obtained by dissolving an electrolyte salt in a nonaqueous solvent which is characterized by containing 0.01-10% by weight of a carboxylate compound represented by the general formula (I) below and 0.01-10% by weight or 0.01-10% by volume of a vinylene carbonate and/or 1,3-propane sultone. Also disclosed is a lithium secondary battery using such a nonaqueous electrolyte solution. (In the formula, R2 represents a hydrogen atom or COOR3 group, R1 and R3 respectively represent an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group or a phenyl group, and X represents an alkynylene group or an alkenylene group.

Abstract: There is disclosed rechargeable cell or battery comprising a negative electrode, a separator, a positive electrode and non-aqueous electrolyte. The negative electrode comprises at least one or more of metallic lithium, a lithium alloy or a material (compound) capable of intercalating lithium ions. At least the positive electrode and optionally also the electrolyte includes a redox shuttle additive to facilitate dissolution of dendritic lithium in the electrolyte.

Abstract: A non-aqueous rechargeable electrochemical cell includes an electrolyte composition produced through the dissolution of a thermally stable lithium salt in a lactone solvent. The resulting cell has stable performance in a wide temperature range between ?40° C. and 80° C. The resulting cell operates across this wide temperature range with a commercially acceptable capacity retention, power loss characteristics, and safety characteristics across this temperature range.

Abstract: Disclosed in an electrolyte for a rechargeable lithium battery, including a mixture of organic solvents including a cyclic solvent and a nitrile-based solvent represented by formula 1 and a lithium salt.

Abstract: In a rechargeable non-aqueous electrolyte secondary battery using positive electrodes, negative electrodes and a non-aqueous electrolytic solution, additives to the electrolytic solution are used in combination, preferably in combination of at least two compounds selected from o-terphenyl, triphenylene, cyclohexylbenzene and biphenyl, and thus there are provided batteries excellent in safety and storage characteristics.

Abstract: A battery capable of obtaining a high energy density and obtaining superior cycle characteristics is provided. The thickness of a cathode active material layer is from 100 ?m to 130 ?m. The thickness of an anode active material layer is from 85 ?m to 120 ?m, and the volume density of the anode active material layer is from 1.7 g/cm3 to 1.85 g/cm3. An electrolytic solution contains 4-fluoro-1,3-dioxolane-2-one. Thereby, even when the thicknesses of the cathode active material layer and the anode active material layer are increased, the diffusion and acceptance of lithium in an anode are improved, and superior cycle characteristics can be obtained.

Abstract: The present invention provides a safe non-aqueous electrolyte secondary battery with characteristics analogous to those of a conventional battery by minimizing battery expansion that causes damage to a device during high temperature exposure or storage. The non-aqueous electrolyte secondary battery comprises: (a) a chargeable and dischargeable positive electrode; (b) a negative electrode capable of absorbing and desorbing lithium; (c) a separator for preventing direct electron transfer between the positive electrode and the negative electrode; and (d) an non-aqueous electrolyte; the non-aqueous electrolyte comprising a non-aqueous solvent and a solute, the non-aqueous solvent comprising a lactone, the solute comprising lithium bis(fluorosulfonyl)imide represented by the formula (1): (F—O2S—N—SO2—F)Li.

Abstract: Disclosed is an electrolyte of a lithium secondary battery comprising a lithium salt, an organic solvent, and at least one additive compound selected from the group consisting of compounds represented by the following formula (1) and derivatives thereof: where R1 is selected from the group consisting of hydrogen radicals, alkyls, aryls, cycloalkyls, alkenyls, alkynyls, ester radicals, and aliphatic carbonate radicals. The electrolyte improves both swelling inhibition properties at high temperature and capacity characteristics of a lithium secondary battery.

Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material; a negative electrode containing a negative electrode active material; and a non-aqueous electrolyte containing a non-aqueous solvent and an electrolyte salt. In order to improve the high-temperature storage characteristics and safety against overcharge due to high-rate charging of the battery, the positive electrode active material contains a layered lithium-transition metal composite oxide containing at least one of Mg, Al, Ti, and Zr. Furthermore, the non-aqueous electrolyte contains 3 to 80% by mass of a tertiary carboxylic acid ester expressed by Chemical Formula 2 below, based on the total mass of the non-aqueous solvent: where R1 to R4 are independent of each other and each represents an alkyl group having 4 or less carbon atoms and being able to be branched.

Abstract: A nonaqueous solvent in a nonaqueous electrolytic solution in a lithium-ion secondary battery 1 contains propylene carbonate (PC), a first compound expressed by formula (I), and a second compound expressed by formula (II). The content of PC in the nonaqueous solvent is at least 10 volume %. The content X [mass %] of the first compound and the content Y [mass %] of the second compound simultaneously satisfy the conditions represented by expressions (1) and (2) [2?(X+Y)?8 (1), 0.01?(Y/X)?0.30 (2)]. R1 to R6 in formula (I) indicate any of a hydrogen atom and hydrocarbon groups having a carbon number of 1 to 3, whereas R7 and R8 in formula (II) indicate any of a hydrogen atom and hydrocarbon groups having a carbon number of 1 to 3.

Abstract: A non-aqueous electrolyte secondary cell excellent in cycle characteristics is provided. This purpose is achieved by the following structure. A non-aqueous electrolyte secondary cell has a positive electrode having a positive electrode active material, a negative electrode having a negative electrode active material, and a non-aqueous electrolyte having a non-aqueous solvent and an electrolytic salt. The positive electrode active material has a lithium-cobalt compound oxide having added therein at least zirconium. The non-aqueous electrolyte has LiBF4 at from 0.05 to 1.0 mass % of a total mass of the non-aqueous electrolyte and unsaturated cyclic carbonate at from 1.0 to 4.0 mass %. The true density ratio of the positive electrode is 0.72 or greater, the true density ratio being represented by formula 1 shown below: (Formula 1) True density ratio=active material apparent density of electrode active material layer÷true density of active material.

Abstract: A subject is to provide a nonaqueous electrolyte excellent in cycle performances such as capacity retention after cycling, output after cycling, discharge capacity after cycling, and cycle discharge capacity ratio, output characteristics, high-temperature storability, low-temperature discharge characteristics, heavy-current discharge characteristics, high-temperature storability, safety, high capacity, high output, high-current-density cycle performances, compatibility of these performances, etc. Another subject is to provide a nonaqueous-electrolyte secondary battery employing the nonaqueous electrolyte. The subjects have been accomplished with a nonaqueous electrolyte which contains a monofluorophosphate and/or a difluorophosphate and further contains a compound having a specific chemical structure or specific properties.

Abstract: This invention discloses a type of mixed additives for electrolyte of lithium-ion secondary batteries, having the following characteristics: in weight percentage: biphenyl series: 0.5% to 95.4%; cyclohexylbenzene series: 1.1% to 93.8%; vinylene carbonate: 0.4% to 93.2%; phenyl vinyl sulfone: 0.5% to 96.5%; ethenyl sulfonyl benzene: 0.5% to 95.8%. This invention also discloses an electrolyte for lithium-ion secondary batteries comprising organic solvents and lithium saline, wherein the special characteristic is that it comprises 2% to 20% weight percentage of said mixed additives. The distinctive advantage of the mixed additives for lithium-ion secondary batteries of this invention is to effectively enhance the overcharging, low-temperature, and cycle properties of lithium-ion batteries. A lithium-ion battery having the mixed additives of this invention remains explosion-free, ignition-free and reliably safe when the lithium-ion secondary battery is overcharging.

Abstract: A secondary battery capable of improving the cycle characteristics and the initial charge and discharge characteristics is provided. The secondary battery includes a cathode, an anode, and an electrolytic solution. The anode has an anode active material layer on an anode current collector. The anode active material layer contains a crystalline anode active material having silicon as an element, and is linked to the anode current collector.

Abstract: The present invention provides a lithium secondary battery having excellent battery cycle property, electrical capacity, storage characteristic and other battery characteristics for a long period of time, and a nonaqueous electrolytic solution which is usable for the lithium secondary battery. A nonaqueous electrolytic solution in which an electrolyte salt is dissolved in a nonaqueous solvent, comprising (i) a dicarbonyl compound represented by the general formula (I), or (ii) a dicarbonyl compound represented by the general formula (II) and vinylene carbonate and the like in the nonaqueous electrolytic solution. (wherein R1 represents a hydrogen atom, an alkyl group, an alkenyl group, a phenyl group or the like; and X represents a hydrogen atom, an R2 group or an OR2 group. R2 represents an alkyl group, an alkenyl group, a phenyl group or the like.

Abstract: An electrolyte for a lithium secondary battery and a lithium secondary battery having the electrolyte, the electrolyte including a lithium salt; a non-aqueous organic solvent including ?-butyrolactone; and succinic anhydride.

Abstract: A method of increasing the discharge capacity retention of a non-aqueous lithium ion secondary battery having a positive electrode active material, a combination of a lithium element and a complex metal oxide, a negative electrode, and a non-aqueous electrolytic solution comprising an electrolyte dissolved in a non-aqueous solvent which is a combination of a cyclic carbonate and a linear carbonate by incorporating a disulfide derivative having the formula: R1—S—S—R2 wherein each of R1 and R2 independently represents a phenyl group, a benzyl group, a tolyl group, a pyridyl group, a pyrimidyl group, an alkyl group having 1 to 12 carbon atom, or a cycloalkyl group having 3 to 6 carbon atoms, in which each group has no substituent groups or has one or more alkyl groups into the non-aqueous electrolytic solution.

Abstract: The invention relates to the use of an amine oxide as an additive in a nonaqueous electrolytic solution. The electrolytic solution is suitable for use in electrochemical cells such as lithium batteries and lithium ion batteries. Batteries using this electrolyte solution have long life and high capacity retention.

Abstract: A non-aqueous electrolyte secondary battery uses, as its positive electrode or negative electrode, an electrode containing an active material and a conductive agent, the active material being made of a mixture of a molybdenum dioxide and a lithium titanium oxide in a weight ratio (molybdenum dioxide: lithium titanium oxide) of from 90:10 to 50:50, and the conductive agent containing graphitized vapor grown carbon fiber and massive graphite. The massive graphite has an average particle size of 10 ?m or greater.