Abstract: A secondary cell employs a nonaqueous electrolyte solution including a nonaqueous solvent and a salt, and a flame retardant material that is liquid at room temperature and pressure and substantially immiscible in the nonaqueous electrolyte solution. The nonaqueous electrolyte solution is formed by dissolving a salt, preferably an alkali metal salt, in a nonaqueous solvent. The nonaqueous solvent preferably includes a cyclic carbonate and/or a linear carbonate. The cyclic carbonate preferably contains an alkylene group with 2 to 5 carbon atoms, and the linear carbonate preferably contains a hydrocarbon group with 1 to 5 carbon atoms. Preferred salts include LiPF6 and LiBF4 at a concentration between about 0.1 and 3.0 moles/liter. The flame retardant material is preferably a halogen-containing compound in an amount by weight of nonaqueous solvent in a range of about 1 to about 99 wt %, and preferred halogen-containing compounds contain perfluoralkyl or perfluorether groups.

Abstract: A nonaqueous electrolyte secondary battery includes positive and negative electrodes, a separator, a nonaqueous electrolyte provided by dissolving a lithium salt in a nonaqueous solvent. The nonaqueous electrolyte contains a compound as shown in the chemical formula below and has a boroxin ring and polyalkylene oxide chains: R1═R1′—(O-Alk1)n1— R2═R2′—(O-Alk2)n2— R3═R3′—(O-Alk3)n3— where AlK1, AlK2, AlK3 are identical with or different from one another, each of AlK1, AlK2, AlK3 representing one type of alkylene having a carbon number of 2 or 3, and R′1, R′2, R′3 are identical with or different from one another, each of R′1, R′2, R′3 representing one type of alkyl having a carbon number of 1 or 2.

Abstract: A lithium cell includes a positive electrode, a negative electrode employing a carbon material as an active material, and a non-aqueous electrolyte including a solute dissolved in a non-aqueous solvent, and is characterized in that the carbon material in the negative electrode has an RA value (IA/IG) of 0.05 or more, the RA value calculated from a peak intensity (IA) of a broad peak PA having a full width at half maximum of 100 cm−1 or more and a peak intensity (IG) in the vicinity of 1580 cm−1 as determined by laser Raman spectroscopy using an argon ion laser having a wavelength of 514.5 nm, the peak intensity (IA) determined from a peak PD in the vicinity of 1360 cm−1, as determined by the aforesaid laser Raman spectroscopy, which is separated into the broad peak PA having the full width at half maximum of 100 cm−1 or more and a peak PB having a full width at half maximum of less than 100 cm−1.

Abstract: The present application discloses a lithium-ion battery using heat-activatable microporous membrane which comprises a hot-melt adhesive, an engineering plastics, a tackifier and a filler. It also discloses methods of preparing such microporous membrane and the lithium-ion batteries. The battery built with the use of the microporous membrane of the present invention shows high rate capability, long cycle life, and low as well as stable impedance during charge-discharge cycling. The microporous membrane of the present invention also shows thermal shutdown behavior.

Abstract: Polymeric compounds are provided the use of which expedites dissociation of an electrolytic salt. The polymeric compounds have a trivalent boron atom which is a Lewis acid. Transport rates of charge carrier ions can be controlled by trapping counter ions of charge carrier ions in the polymeric chain.

Abstract: Disclosed is an electrochemical cell comprising a lithium anode and a sulfur-containing cathode and a non-aqueous electrolyte solvent. In the fully charged state of the cell the concentration of lithium ions is preferably less than 0.3 M. The cell delivers high discharge capacity at discharge rates, for example, C/5, over temperatures ranges of from +25° C. to −20° C. Also disclosed is a battery including an electrochemical cell according to the invention and a device that utilizes such a battery to derive power.

Abstract: This invention relates to electrolytes containing ethyl methyl carbonate as a solvent for use in lithium cells or batteries containing metal phosphate cathodes. The invention further relates to electrolytes comprising ethyl methyl carbonate, ethylene carbonate, diethyl carbonate and propylene carbonate for use in lithium cells or batteries with metal phosphate cathodes, and to batteries employing such electrolytes. The electrolytes of the present invention are an improvement over other electrolytes used in lithium cells or batteries with metal phosphate cathodes in that the electrolytes are less prone to gassing and therefore have better shelf stability.

Abstract: Disclosed is a nonaqueous electrolyte comprising a nonaqueous solvent which contains ethylene carbonate (EC), propylene carbonate (PC), &ggr;-butyrolactone (BL), and a fourth component, which is a solvent other than the EC, PC and BL, and the mixing ratio x (% by volume) of EC based on the total amount of the nonaqueous solvent falls within a range of between 15 and 50, the mixing ratio y (% by volume) of PC based on the total amount of the nonaqueous solvent falls within a range of between 2 and 35, the mixing ratio z (% by volume) of BL based on the total amount of the nonaqueous solvent falls within a range of between 30 and 85, and the mixing ratio p (% by volume) of the fourth component based on the total amount of the nonaqueous solvent is larger than 0 and is not larger than 5.

Abstract: The present invention relates to a lithium secondary battery comprising an overdischarge-preventing agent. Particularly, the present invention provides a lithium secondary battery comprising an overdischarge-preventing agent having superior effects for an overdischarge test and showing 90% or more capacity recovery after the test, by introducing lithium nickel oxide into a cathode for a lithium secondary battery comprising a lithium transition metal oxide capable of occluding and releasing lithium ions as an overdischarge-preventing agent to supply lithium ions such that irreversible capacity of an anode can be compensated or better, thereby lowering voltage of a cathode first to prevent voltage increase of an anode during the overdischarge test.

Abstract: Primary and secondary Li-ion and lithium-metal based electrochemical cell systems. Suppression of gas generation is achieved in the cell through the addition of an additive or additives to the electrolyte system of the respective cell, or to the cell whether it be a liquid, a solid- or plastized polymer electrolyte system. The gas suppression additives are preferably based on unsaturated hydrocarbons.

Abstract: The invention provides a battery which can improve cycle characteristics by forming a more stable and stronger film on the surface of an anode active material layer. A cathode and an anode are layered with a separator in between. The anode has an anode collector and the anode active material layer. The anode active material layer contains Si, Sn, or an alloy thereof, and formed by vapor-phase method, liquid phase method, or sinter method. It is preferable that the anode active material layer is alloyed with the anode collector on at least a part of interface between the anode active material layer and the anode collector. The separator is impregnated with an electrolyte solution. The electrolyte solution contains cyclic carbonic ester having saturated bonds such as vinylene carbonate and vinylethylene carbonate as a solvent. Consequently, a strong and stable film is formed on the surface of the anode active material layer, and decomposition of the electrolyte solution in the anode is inhibited.

Abstract: The addition of a compound which reductively decomposes on a potential at least 1.0 V higher than the equilibrium potential of metallic lithium and lithium ions (a potential versus Li/Li+ of +1.0 V or more) to an electrolyte solution for a secondary cell keeps propylene carbonate, when used as an organic electrolyte therein, from decomposing on the negative electrode. Such addition also improves the cycle properties, electrical capacity and low-temperature characteristics of the cell.

Abstract: An electrolyte containing calcium bistrifluoromethanesulfonimide [Ca((CF3SO2)2N)2] for a nonaqueous battery. The calcium bistrifluoromethanesulfonimide is soluble in an organic solvent and a molten salt having a melting point of not greater than 60° C.

Abstract: In order to manufacture a lithium secondary battery having excellent performances in safety under overcharge condition, cycle property, electric capacity, and storage endurance, 0.1 wt. % to 10 wt. % of a tert-alkylbenzene compound is favorably incorporated into a non-aqueous electrolytic solution comprising a non-aqueous solvent and an electrolyte, preferably in combination with 0.1 wt. % to 1.5 wt. % of a biphenyl compound.

Abstract: In a non-aqueous electrolyte secondary battery provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, a positive electrode active material is a mixture of lithium-manganese composite oxide and at least one of lithium-nickel composite oxide represented by a general formula LiNiaM11−aO2 and lithium-cobalt composite oxide represented by the general formula LiCobM21−bO2, and said non-aqueous electrolyte solution contains at least a saturated cyclic carbonic acid ester and an unsaturated cyclic carbonic acid ester having double bond of carbon where content by amount of said unsaturated cyclic carbonic acid ester having double bond of carbon is in a range of 1.0×10−8 to 2.4×10−4 g per positive electrode capacity 1 mAh.

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.

Abstract: An electrolyte for a lithium secondary battery comprises a non-aqueous organic solvent including 20 to 95 vol % of an ester-based or ether-based organic solvent based on the total amount of organic solvent; lithium salts; and an additive compound having at least two carbonate groups. A lithium secondary battery including this electrolyte has good swelling inhibition properties as well as electrochemical properties such as capacity and cycle life.

Abstract: A non-aqueous secondary battery having an electrode group and a non-aqueous electrolytic solution, characterized in that :(1) the electrode group is contained in a casing made of a sheet having a resin layer with a thickness of 0.5 mm or less, (2) the non-aqueous solvent contains &ggr;-butyrolactone, ethylene carbonate, at least one vinylene carbonate compound and at least one vinylethylene carbonate compound, (3) the amounts of the vinylene carbonate compound, the vinylethylene carbonate compound and sum total of both are, respectively, 0.01 to 5% by weight, 0.01 to 5% by weight and 0.02 to 6% by weight, based on the total weight of the non-aqueous solvent, and (4) the amounts of the &ggr;-butyrolactone and the ethylene carbonate are, respectively, 50% by volume or more and 10% by volume or more, based on the total volume of the non-aqueous solvent.

Abstract: An organic electrolytic solution containing a lithium salt, an organic solvent, and an oxalate compound, and a lithium battery using the organic electrolytic solution are provided. Due to the oxalate compound, the organic electrolytic solution stabilizes lithium metal and improves the conductivity of lithium ions. Also, the organic electrolytic solution present invention improves charging/discharging efficiency when used in lithium batteries having a lithium metal anode. Especially when the organic electrolytic solution is used in lithium sulfur batteries, the oxalate compound forms a chelate with lithium ions and improves the ionic conductivity and the charging/discharging efficiency of the battery. In addition, due to the chelation of the lithium ions, negative sulfur ions remain free without interaction with lithium ions, are highly likely to dissolve in an electrolytic solution. As a result, a reversible capacity of sulfur is improved.

Abstract: Electrolyte solutions were suggested for electrochemical cells, for example for double-layer capacitors, which showed conductivities of more than 20 mS/cm at 25° C., at least comprising of a primary salt, which is released in a solvent alloy of “A” at least a solvent of high polarity and “B” at least a non-toxic solvent of low viscosity. Because of the low or non-availability of parts of acetonitrile, the electrolyte solutions are not in danger of a release of hydrogen cyanide if fire breaks out.

Abstract: A non-aqueous electrolyte containing propylene carbonate and 1,3-propanesultone as additives can reduce the amount of a gas evolved during storage at a high temperature of a non-aqueous electrolyte secondary cell comprising the electrolyte, a non-aqueous electrolyte containing at least one compound selected from the group consisting of vinylene carbonate, diphenyl disulfide, di-p-tolyldisulfide and bis(4-methoxyphenyl)disulfide as an additive can improve cycle characteristics of a non-aqueous electrolyte secondary cell comprising the electrolyte, and a non-aqueous electrolyte containing a combination of the above two types of additives can provide a non-aqueous electrolyte secondary cell exhibiting excellent retention of capacity and storage stability.

Abstract: In a non-aqueous electrolyte secondary battery, a cyclic carboxylic acid ester having a high conductivity in a low-temperature environment is used as an electrolyte, and, furthermore, a cyclic carbonic acid ester having at least one carbon-carbon unsaturated bond is added thereto for the inhibition of reductive decomposition of the cyclic carboxylic acid ester.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode comprising a graphite as a negative electrode active material, and a nonaqueous electrolyte including at least a saturated cyclic carbonic ester and containing a cyclic carbonic ester having a carbon-carbon double bond such that, when a content of the cyclic carbonic ester having a carbon-carbon double bond is x (g), a content of the graphite in the negative electrode is B (g), a specific surface area of the graphite is A (m2/g), a size of the crystallite of the graphite in a direction of the c axis is Lc, and a size of the crystallite of the graphite in a direction of the a axis is La, a condition expressed by

Abstract: In a non-aqueous electrolyte secondary battery provided with a positive electrode, a negative electrode using carbon material as negative electrode active material, and a non-aqueous electrolyte solution, the non-aqueous electrolyte solution contains at least a saturated cyclic carbonic ester and a cyclic carbonic ester having C═C double bond where an amount of the cyclic carbonic ester having C═C double bond is in a range of 1.0×10−8 to 13.0×10−5 g per negative electrode capacity of 1 mAh.

Abstract: The present invention relates to a lithium ion battery, more particularly to a new electrolyte for a lithium ion battery, the new electrolyte comprising a compound which is either 4-carbomethoxymethyl 1,3-dioxan-2-one or 4-carboethoxymethyl 1,3-dioxan-2-one. Each of these compounds comprises a cyclic ring carbonate structure and a linear carbonate structure. The battery also comprises an anode including graphitized carbon and a cathode including a lithium transition metal oxide, and exhibits a superior charge-discharge life cycle characteristic and low temperature performance.

Abstract: A nonaqueous electrolytic solution and a lithium battery employing the same include a lithium salt, an organic solvent, and a halogenated benzene compound. The use of the nonaqueous electrolytic solution causes formation of a polymer by oxidative decomposition of the electrolytic solution even if a sharp voltage increase occurs due to overcharging of the battery, leading to consumption of an overcharge current, thus protecting the battery.

Abstract: The present invention relates to a solid polymer electrolyte of polyether poly(N-substituted urethane) comprising an electrolytic compound and a polymer matrix, wherein the polymer matrix is a copolymer comprising polyether unit and polyurethane unit and has 50,000-2,000,000 of a weight average molecular weight, where N-positions of the polyurethane unit are substituted with oligo(ethylene oxide) derivatives which provide flexibility and electrolytic conduction of the polymer matrix by controlling its length, composition, structure and crosslinked degree. Accordingly, the solid polymer electrolyte of the present invention provides excellent thermal stability, electrochemical stability and mechanical properties and thus, is suitable for use in polymer secondary batteries and electrochemical devices.

Abstract: An electrolyte system for lithium batteries with enhanced safety. The system contains at least one conductive salt containing lithium and at least one electrolyte liquid. The electrolyte liquid contains an effective amount of a partially fluorinated compound derived from a diol corresponding to the formula (I): R1CO—O—[CHR3(CH2)m—O]n—R2  (I) in which R1 is a (C1-C8)-alkyl or (C3-C8)-cycloalkyl group, and each R1 group is partially fluorinated or perfluorinated so that at least one hydrogen atom of the group is replaced by fluorine; R2 is a (C1-C8)-alkylcarbonyl or (C3-C8)-cycloalkylcarbonyl group, and each R2 group may optionally be partially fluorinated or perfluorinated; R3 is a hydrogen atom or a (C1-C8)-alkyl or (C3-C8)-cycloalkyl group; m is 0, 1, 2 or 3; and n is 1, 2 or 3.

Abstract: The invention relates to a rechargeable electrochemical cell comprising a negative electrode, an electrolyte and a positive electrode in which the positive electrode structure comprises a lithium cobalt manganese oxide of the composition Li2CoyMn2−yO4 where 0<y<0.6. The lithium cobalt manganese oxide of the above formula can be the only active compound or can be used together with one or more other rechargeable compounds. The lithium cobalt manganese oxide of the above formula may be in air and moisture insensitive tetragonal form and provides additional active lithium to compensate for capacity losses in lithium ion cells and lithium-alloy cells.

Abstract: The invention relates to the use of salt-based compounds as additives in electrolytes for improvinq the properties of electrochemical cells.

Abstract: A non-aqueous electrolytic solution favorably employable for a lithium secondary battery employs a non-aqueous solvent composed of a cyclic carbonate, a linear carbonate and vinylene carbonate, and shows a reduction potential of less than 1 volt, with reference to lithium, or contains chlorine atom-containing organic compounds in an amount of 10 ppm or less, in terms of chlorine atom content.

Abstract: The present invention provide a nonaqueous electrolyte comprising a nonaqueous solvent, wherein the nonaqueous solvent includes ethylene carbonate (EC), propylene carbonate (PC), &ggr;-butyrolactone (GBL) and a fourth component that is a solvent other than the EC, the PC and the GBL, and the nonaqueous solvent satisfies the following equations (1) to (4): 1 15 ≦ x ≦ 50 (1) 30 ≦ y ≦ 75 (2)  0 < z < 30 (3)  0 < p ≦ 5 (4)

Abstract: An organic salt having an alkali metal bound to a disubstituted amide of alkane iminosulfinic acid has the following general formula: 1

Abstract: Provided are a polymeric gel electrolyte comprising a lithium salt, an organic solvent and a thermal curing product of a composition having a terpolymer having a repeating unit represented by formula (1), a repeating unit represented by formula (2) and a repeating unit represented by formula (3): wherein n is an integer from 1 to 12, and R is a C1 to C12 alkyl group, and a lithium battery employing the polymeric electrolyte. Use of a polymeric gel electrolyte according to the present invention can effectively suppress swelling due to an electrolytic solution, and a lithium battery which can prevent reliability and safety from being lowered due to the swelling, can be attained.

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+1SO3 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: Using a crystal (lithium cobaltate) having a crystallite size in the direction of (003) plane of not less than 800 angstrom and a coordination number of a cobalt atom to a different cobalt atom of not less than 5.7 as a positive electrode active material, a lithium ion secondary battery is formed. As a result, the rate characteristic, low temperature characteristic, cycle characteristic and the like of the lithium ion secondary battery can be improved. In addition, by combining a preferable embodiment of the positive plate such as (an embodiment wherein not more than 50% of the surface of a positive electrode active material is covered with a conductive material), (an embodiment wherein two kinds of conductive materials having a particle size of not less than 3 &mgr;m and a particle size of not more than 2 &mgr;m are used, or one kind of a conductive material having a particle size of not more than 10 &mgr;m is used and the porosity of the positive electrode coating layer is 0.08 cc/g-0.

Abstract: A lithium electrochemical cell of either a primary or a secondary chemistry activated with an electrolyte having a cyclic carbonate of a ring size equal to or larger than a six-member ring is described. The cyclic carbonate helps to make the anode passivation film ionically conductive to thereby eliminate voltage delay during pulse discharge and to reduce Rdc. Such a cell is particularly well suited for powering an implantable medical device, such as a cardiac defibrillator.

Abstract: A lithium electrochemical cell includes an electrolyte having a mixture of solvents including propylene carbonate (PC) and dimethoxyethane (DME), and a salt mixture. The salt mixture includes lithium trifluoromethanesulfonate (LiTFS), and lithium trifluoromethanesulfonimide (LiTFSI), and the cell contains less than 1500 ppm by weight of sodium. The mixture of solvents can further include ethylene carbonate (EC).

Abstract: The inventors provide a non-aqueous electrolyte secondary battery in which the mass ratio of positive active materials, i.e., the mass ratio of lithium cobalt oxide to lithium manganese oxide is adjusted to improve both energy density and safety and in which a solvent containing ethylene carbonate (EC) and propylene carbonate (PC) is used so that the EC content and the PC content can be controlled to prevent swelling and improve both safety at overcharge and safety at a high temperature.

Abstract: A non-aqueous secondary organic battery. The battery includes an positive electrode of polyaniline-conductive carbon black composite (PAn-C composite). The PAn-C composite is prepared using a high-speed impingment mill with high-speed fluid striking and grinding functions. The resulting PAn-C composite has higher conductivity than the mixture of conductive carbon and PAn by direct mixing. The non-aqueous secondary organic battery of the present invention exhibits great capacity and energy density.

Abstract: A secondary cell employs a non-aqueous electrolyte solution including a non-aqueous solvent and a salt, and a flame retardant material that is a liquid at room temperature and pressure and substantially immiscible in the non-aqueous electrolyte solution. The non-aqueous electrolyte solution is formed by dissolving a salt, preferably an alkali metal salt, in a non-aqueous solvent. The non-aqueous solvent preferably includes a cyclic carbonate and/or a linear carbonate. The cyclic carbonate preferably contains an alkylene group with 2 to 5 carbon atoms, and the linear carbonate preferably contains a hydrocarbon group with 1 to 5 carbon atoms. Preferred salts include LiPF6 and LiBF4 at a concentration between about 0.1 to 3.0 moles/liter in the non-aqueous solvent.

Abstract: A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one carbonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture including ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate. The preferred additive is either a linear or cyclic carbonate containing covalent O—X and O—Y bonds on opposite sides of a carbonyl group wherein at least one of the O—X and the O—Y bonds has a dissociation energy less than about 80 kcal/mole.

Abstract: A lithium/fluorinated carbon electrochemical cell having the CFx material supported on a titanium current collector screen sputter coated with a noble metal is described. The gold, iridium, palladium, platinum, rhodium and ruthenium-coated titanium current collector provides the cell with higher rate capability, even after exposure to high temperatures, in comparison to cells of a similar chemistry having the CFx contacted to a titanium current collector painted with a carbon coating.

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 lithium secondary battery comprising positive and negative electrodes both capable of occluding and releasing lithium ions, and a lithium ion conductive material which contains a compound of formula (1) exhibits improved characteristics including charge/discharge efficiency, low-temperature properties and cycle performance when (a) only one substituent group of R1, R2, R3 and R4 in formula (1) is alkyl, (b) the negative electrode-constituting material partially contains a carboxyl or hydroxyl group-bearing compound, and the lithium ion conductive material contains propylene carbonate, or (c) a positive electrode active material is a lithium-containing transition metal compound, a negative electrode active material is a carbonaceous material, and the lithium ion conductive material contains as a non-aqueous electrolysis solution a solvent mixture of propylene carbonate and ethylene carbonate in combination with a chain-like carbonate as a low-viscosity solvent.

Abstract: A method for manufacturing galvanic elements having a liquid organic electrolyte that contain an electrode-separator assembly that has at least one lithium intercalating electrode in whose polymer matrix insoluble, electrochemically active materials are finely distributed in the polymer involved, the electrolyte contains about 2% to about 15% by weight of a hydrocarbon-oxygen compound (carbonate) that has a central carbon atom, to which one oxygen atom is doubly bonded and two oxygen are singly bonded, where the singly bonded oxygen is not saturated by any other atoms or groups and a hydrocarbon chain having a length of four carbon atoms or less is bonded to each of those singly bonded oxygen atoms and these two chains differ by at least one, but no more than three, CH2 groups, and this electrode-separator assembly is initially impregnated with this electrolyte, then cut to size, and subsequently inserted into a housing.

Abstract: A highly safe non-aqueous electrolyte secondary cell with excellent self-extinguishing property or flame retardancy is provided which comprises an anode, a cathode, a non-aqueous electrolyte in which an Li-salt as a supporting salt is dissolved in an organic solvent, and a separator. When a high crystalline carbon material such as graphite is used as cathode active substances, it is possible to provide a non-aqueous electrolyte secondary cell whose charging/discharging life is lengthened, whose interface resistance at the non-aqueous electrolyte can be reduced, and which has excellent discharging characteristics at low temperature.

Abstract: The invention relates to non-aqueous electrochemical cell comprising: a first electrode and a second counterelectrode each capable of reversibly incorporating an alkali metal, preferably lithium; an alkali metal incorporated into at least one of said electrodes; and an electrolyte comprising at least one salt of the alkali metal and a non-aqueous solvent; wherein the said salt is capable of generating HF in the presence of water and the cell includes at least one component, such as a temperature sensitive separator, which precludes complete removal of residual water from the cell, and wherein the cell includes sufficient of an unsaturated cyclic carbonate to reduce the concentration of HF formed by reaction of the electrolyte salt with the residual water.

Abstract: The present invention relates to a lithium ion battery, more particularly to a new electrolyte and a lithium ion battery which comprises the same using an anode including graphitized carbon and a cathode including lithium-containing transition metal oxide. The present invention provides a compound of 4-carbomethoxymethyl-1,3-dioxan-2-one or 4-carboethoxymethyl-1,3-dioxolan-2-one represented by formula (1) which comprises both a cyclic ring carbonate structure and a linear carbonate structure, a lithium-containing electrolyte which includes the compound of formula (1), and a lithium ion battery which includes the electrolyte using the anode including graphitized carbon and the cathode including lithium-containing transition metal oxide. The lithium ion battery of the present invention fabricated by using the new compound has high electric capacity because of the graphitized carbon, and superior charge-discharge cyclic life characteristic and low temperature performance.

Abstract: A salt additive to lithium conducting organic electrolytes which thermally stabilizes the solution and more particular to provide improved cell operation and storage of lithium ion cells at elevated temperatures is LiBF4 and is employed in a salt molar ratio of at least about 1:1.