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 a carbonate or oxalate derivative having at least one substituted or unsubstituted cyano group. The organic electrolytic solution and the lithium battery employing the same have improved reductive decomposition stability, thereby decreasing an irreversible capacity after a first cycle and improving the charge/discharge efficiency and lifespan of the battery. The lithium battery has non-varying chemical properties at room temperature and a uniform thickness after standard charging, and thus has high reliability.

Abstract: A battery capable of improving cycle characteristics is provided. An anode includes: an anode active material layer including an anode active material on an anode current collector, the anode active material including silicon (Si) and having a plurality of pores, in which after electrode reaction, the volumetric capacity of a pore group with a diameter ranging from 3 nm to 200 nm both inclusive per unit weight of silicon is 0.3 cm3/g or less, and the rate of change in the amount of mercury intruded into the plurality of pores is distributed so as to have a peak in a diameter range from 200 nm to 15000 nm both inclusive, the rate of change in the amount of mercury intruded being measured by mercury porosimetry.

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: Pyrrolidinium-based room temperature ionic liquids, and phosphorus and arsenic analogues, are used as electrolytes in energy storage devices including secondary lithium batteries, supercapacitors and asymmetric battery-supercapacitors. The electrolytes preferably contain lithium ions as the charge-carrying species. The electrolytes are in a liquid state at the operating temperature.

Abstract: A separator which includes a covering layer in which a fine framework of polyolefin resin is coated with a glass layer and an exposed layer in which the polyolefin resin is exposed is provided. A battery is provided having a cathode and an anode, an electrolyte, and a separator where the separator has the covering layer in which the fine framework of polyolefin resin is coated with the glass layer and a method for manufacturing a separator including the step of coating a fine framework of polyolefin resin with the glass layer by applying a precursor containing viscous liquid product which contains only polysilazane compound or a mixture of viscous liquid product which contains only polysilazane compound with polycarbosilazane compound to the polyolefin resin and placing the precursor applied polyoleline resin in a water bath to dry.

Abstract: Electrical storage devices having excellent low-temperature properties can be obtained by using a quaternary salt (or ionic liquid) of general formula (1) below as an electrolyte salt for electrical storage devices or a liquid electrolyte for electrical storage devices. In formula (1), R1 to R4 are each independently an alkyl group of 1 to 5 carbons or an alkoxyalkyl group of the formula R?—O—(CH2)n—, with the proviso that at least one group from among R1 to R4 is the above alkoxyalkyl group. X is a nitrogen or phosphorus atom, and Y is a monovalent anion.

Abstract: A composition useful as an electrolyte in a lithium-ion battery comprises at least one C3-C6 carbonate or a lactone, at least one unsaturated cyclic carbonate in a v/v proportion less than 5% of the volume of the other constituents of the composition, lithium hexafluorophosphate (LiPF6) and at least 0.2 mol/l lithium bis(oxalatoborate). A battery using this electrolyte is suitable for operation at temperatures down to about ?50° C.

Abstract: An electrochemical cell includes a cathode containing MnO2 and an anode including lithium. The cell also includes an electrolyte containing a bis(oxalato)borate salt. The cell further includes an aluminum surface in electrical contact with a non-aluminum metal surface.

Abstract: A battery capable of improving cycle characteristics is provided. A separator arranged between a cathode and an anode is impregnated with an electrolytic solution. The electrolytic solution includes: a solvent; and an electrolytic salt, in which the solvent includes a compound having a difluoroalkene structure. The content of the compound having a difluoroalkene structure in the solvent is within a range from 1 wt % to 5 wt % both inclusive.

Abstract: An electrochemical cell comprises as an anode, a lithium transition metal oxide or sulphide compound which has a [B2]X4n? spinel-type framework structure of an A[B2]X4 spinel wherein A and B are metal cations selected from Li, Ti, V, Mn, Fe and Co, X is oxygen or sulphur, and n? refers to the overall charge of the structural unit [B2]X4 of the framework structure. The transition metal cation in the fully discharged state has a mean oxidation state greater than +3 for Ti, +3 for V, +3,5 for Mn, +2 for Fe and +2 for Co. The cell includes as a cathode, a lithium metal oxide or sulphide compound. An electrically insulative lithium containing liquid or polymeric electronically conductive electrolyte is provided between the anode and the cathode.

Abstract: An alkaline dry battery includes a positive electrode, a negative electrode, a separator, and an alkaline electrolyte. The separator is provided between the positive electrode and the negative electrode, and the positive electrode, the negative electrode, and the separator are impregnated with the alkaline electrolyte. A battery depolarizer, which is an organic compound having a function of depolarizing both the positive electrode and the negative electrode or an alkaline metal salt thereof, is added to at least the alkaline electrolyte.

Abstract: A non-aqueous electrolytic solution secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolytic solution, wherein the non-aqueous electrolytic solution contains a halide of an element selected from the group consisting of Zr and elements belongings to the Group 5, the Group 6 and the Groups 12 to 15 of the Periodic Table.

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: Disclosed is an electrolyte comprising: (a) an electrolyte salt; (b) a non-aqueous electrolyte solvent; and (c) a binary or multinary metal oxide salt. An electrochemical device comprising the same electrolyte is also disclosed. The metal oxide salt used in the electrolyte is dissolved in a non-aqueous solvent and generates oxyanions capable of improving corrosion resistance of metals. Therefore. the electrolyte prevents corrosion of metallic materials present in an electrochemical device, caused by extreme conditions, such as overcharge, overdischarge and high-temperature storage conditions, to which the device is exposed. Further, the electrolyte prevents degradation in the quality of an electrochemical device, caused by corrosion of metallic materials.

Abstract: Disclosed is a nonaqueous electrolytic solution useful for producing a lithium secondary battery having excellent cycle characteristics. Specifically disclosed is a nonaqueous electrolytic solution for lithium secondary batteries obtained by dissolving an electrolyte salt in a nonaqueous solvent which is characterized by containing 0.1 to 10 wt. % of a tert-alkylbenzene compound and also containing 0.001-0.5 wt. % of a benzene compound, wherein a hydrocarbon group having 1-4 carbon atoms is bonded to a benzene ring via the tertiary carbon atom, relative to the tert-alkylbenzene compound.

Abstract: A nonaqueous electrolyte composition containing an electrolyte salt, a nonaqueous solvent and a compound having a phosphorus-hydrogen bond or a phosphorus-carbon bond is provided. Also provided is a nonaqueous electrolyte secondary battery including: a cathode and an anode having a material capable of occluding and releasing lithium ions as a cathode active material and an anode active material, respectively; a nonaqueous electrolyte composition; a separator; and an outer package member for housing the anode, the cathode, the nonaqueous electrolyte composition and the separator. The nonaqueous electrolyte composition includes an electrolyte salt, a nonaqueous solvent and a compound having a phosphorus-hydrogen bond or a phosphorus-carbon bond.

Abstract: A non-aqueous electrolyte secondary cell superior in safety against overcharge and in high-temperature cycle characteristic is provided. The non-aqueous electrolyte secondary cell includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a pressure sensitive safety mechanism that is actuated upon increase in the cell internal pressure. The positive electrode contains lithium carbonate at 0.5 to 1.5 mass %. The non-aqueous electrolyte contains a cycloalkyl benzene compound and/or a compound having a benzene ring and a quaternary carbon adjacent to the benzene ring, the compound or compounds being contained at 0.5 to 2 mass % in total.

Abstract: A flame retarding polymer electrolyte composition containing maleimides includes a modified maleimide; a lithium salt; and at least one ionic solution in a ratio of at least 2 wt % relative to the total weight of the composition. By using the hyperbranched dendrimer-like structure of the modified maleimide as grafted skeleton for polymer electrolytes, the electrolyte composition can encapsulate an electrolytic solution continuously, thus preventing the exudation of the electrolytic solution and increasing the stability of lithium ionic conduction. Since the ionic solution is nonflammable, the safety of batteries are further enhanced when the polymer electrolyte composition is used as polymer electrolyte for a lithium secondary battery.

Abstract: A negative electrode is provided. The negative electrode includes a negative electrode current collector, and a negative electrode active material layer formed over the negative electrode current collector, wherein an organic material layer having ion conductivity is held by the negative electrode active material layer.

Abstract: The invention concerns novel ionic compounds with low melting point whereof the onium type cation having at least a heteroatom such as N, O, S or P bearing the positive charge and whereof the anion includes, wholly or partially, at least an ion imidide such as (FX1O)N?(OX2F) wherein X1 and X2 are identical or different and comprise SO or PF, and their use as solvent in electrochemical devices. Said composition comprises a salt wherein the anionic charge is delocalised, and can be used, inter alia, as electrolyte.

Abstract: A non-aqueous electrolyte secondary battery, comprises positive and negative electrode plates, each comprising a current collector and a material mixture layer carried on each face thereof. A total thickness of the positive electrode material mixture layers on both faces of the current collector is 40 ?m to 100 ?m. The positive electrode plate has an electrode area of 520 cm2 to 800 cm2 per battery capacity of 1 Ah. The negative electrode material mixture layer comprises a graphitizable carbon material. A wide-range X-ray diffraction pattern of the graphitizable carbon material has a peak PX (101) attributed to a (101) crystal face at about 2?=44 degrees, and a peak PX (100) attributed to a (100) crystal face at about 2?=42 degrees. A ratio of an intensity IX (101) of PX (101) to an intensity IX (100) of PX(100) satisfies: 0<IX (101)/IX (100)<1.

Abstract: Disclosed is a non-aqueous electrolyte for a rechargeable lithium battery including a polyether-modified silicon oil in which a polyether chain is bonded to a terminal end of a linear polysiloxane, a cyclic carbonate, and a lithium salt.

Abstract: Organic electrolyte solutions and lithium batteries using the same are provided. The organic electrolyte solutions use a silane compound that prevents crack formation caused by volumetric changes in the anode active material during battery charging/discharging. This improves charge/discharge characteristics, thereby also improving stability, reliability, and charge/discharge efficiency of the battery.

Abstract: The present invention relates to an ink composition for spacer formation and a spacer element using the same, and more particularly to an ink composition for spacer formation including a) 10 to 70 parts by weight (dry weight) of a polymer emulsion; b) 0.1 to 50 parts by weight of weight of wetting agent; and c) 20 to 90 parts by weight of solvent, and a spacer element using the same. The ink composition of the present invention has a significantly low viscosity and can be sprayed easily by inkjet, so that it is useful for spacer formation in liquid crystal displays.

Abstract: Disclosed is an electrolyte for an electrochemical cell wherein the electrolyte includes a solvent mixture comprising a dioxolane and one or more of 1,2-dialkoxyalkanes of 5 or 6 carbon atoms and/or 1,3-dialkoxyalkanes of 5 or 6 carbon atoms. Also disclosed are cells and batteries including the electrolyte. An electrochemical cell including the electrolyte preferably has an anode that includes lithium and a cathode including an electroactive sulfur-containing material.

Abstract: A lithium secondary battery comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the positive electrode or the negative electrode is an electrode obtained by depositing a thin film of active material capable of lithium storage and release on a current collector, the thin film is divided into columns by gaps formed therein in a manner to extend in its thickness direction and the columnar portions are adhered at their bottoms to the current collector, and the nonaqueous electrolyte contains at least one selected from phosphate ester, phosphite ester, borate ester and carboxylic ester having a fluoroalkyl group.

Abstract: 1. A non-aqueous electrolytic solution comprising an electrolytic salt in a non-aqueous solvent, which further contains a pentafluorophenoxy compound having the formula (I): in which R represents a substituting group such as an alkylcarbonyl group, an alkoxycarbonyl group, an aryloxy-carbonyl group, and an alkanesulfonyl group, under the condition that at least one hydrogen atom contained in the substituting group can be substituted with a halogen atom or an aryl group.

Abstract: A non-aqueous electrolyte secondary battery including a unit cell including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, the positive electrode capacity being greater than the negative electrode capacity, and at least a portion of the non-aqueous electrolyte is gasified during charging.

Abstract: The present invention provides a lithium secondary battery which is improved particularly in cycle characteristics. Disclosed is a lithium secondary battery which uses a non-aqueous electrolytic solution obtained by dissolving electrolyte salt in a non-aqueous solvent. The non-aqueous electrolytic solution further contains a pentafluorophenyloxy compound represented by the formula (I), and vinylene carbonate and/or 1,3-propanesultone. In the formula (I), R1 is a substituent selected from the group consisting of an alkylcarbonyl group having 2 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 12 carbon atoms, an aryloxycarbonyl group having 7 to 18 carbon atoms, and an alkanesulfonyl group having 1 to 12 carbon atoms. At least one hydrogen atom of the substituent can be substituted with a halogen atom or an aryl group having 6 to 18 carbon atoms.

Abstract: Disclosed is an electrolyte for batteries, comprising: (a) an electrolyte salt; (b) an organic solvent; (c) a first compound having an oxidation initiation voltage (vs. Li/Li+) higher than the operating voltage of a cathode; and (d) a second reversible compound having an oxidation initiation voltage higher than the operating voltage of the cathode, but lower than the oxidation initiation voltage of the first compound. Also disclosed is a lithium secondary battery comprising said electrolyte. In the lithium secondary battery, two compounds having different safety improvement actions at a voltage higher than the operating voltage of the cathode are used in combination as electrolyte components. Thus, the safety of the secondary battery in an overcharged state can be ensured, and at the same time, the deterioration of the battery can be prevented from occurring when it is repeatedly cycled, continuously charged and stored at high temperature for a long time.

Abstract: A lithium-sulfur battery includes a positive electrode having at least one positive active material selected from the group consisting of an elemental sulfur, Li2Sn (n?1), Li2Sn (n?1) dissolved in catholytes, an organosulfur compound, and a carbon-sulfur polymer ((C2Sx)n: x=2.5˜50, n?2), an electrolyte having salts of an organic cation, and a negative electrode having a negative active material selected from the group consisting of a material capable of reversibly intercalating/deintercalating lithium ions, a material capable of reversibly forming a lithium-containing compound by a reaction with lithium ions, a lithium metal, and a lithium alloy.

Abstract: A battery with a high capacity and superior cycle characteristics, and an anode active material used for it are provided. An anode active material contains tin as a first element, a second element, and a third element. The second element is at least one from the group consisting of boron, carbon, aluminum, and phosphorus, and the third element is at least one from the group consisting of silicon, magnesium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, zirconium, niobium, molybdenum, silver, indium, cerium, hafnium, tantalum, tungsten, and bismuth. The content of the second element in the anode active material is from 9.8 wt % to 49 wt %.

Abstract: A proton conductor and film thereof, electrochemical device, such as a fuel cell, employing same and methods of manufacturing same are provided. The proton conductor material film includes a proton conductor and polyvinyl alcohol as a binder for the proton conductor. The proton conductor film develops a high output by an electrode reaction and has superior hydrogen gas intercepting performance.

Abstract: The present invention relates to a non-aqueous electrolyte additive for improving safety and a lithium secondary battery comprising the same, and more particularly to a non-aqueous electrolyte additive that can improve cycle life and safety properties of a lithium ion secondary battery. According to the present invention, an organometallic compound represented by the Chemical Formula 1 is added to a non-aqueous electrolyte of a battery as an additive, and thus if a battery voltage is out of normal operation voltage range due to a short circuit and overcharge of a battery, etc., the non-aqueous electrolyte additive decomposes and a part of the decomposed additive polymerizes to form an insulating film on a cathode surface, and a part of the metal reacts with an insulating film formed on a cathode surface to improve thermal stability of the battery, thereby improving safety of the battery.

Abstract: The present invention relates to a non-aqueous electrolyte additive for improving safety and a lithium secondary battery comprising the same, and more particularly to a non-aqueous electrolyte additive that can improve cycle life and safety properties of a lithium ion secondary battery. According to the present invention, an organometallic compound represented by the Chemical Formula 1 is added to a non-aqueous electrolyte of a battery as an additive, and thus if a battery voltage is out of normal operation voltage range due to a short circuit and overcharge of a battery, etc., the non-aqueous electrolyte additive decomposes and a part of the decomposed additive polymerizes to form an insulating film on a cathode surface, and a part of the metal reacts with an insulating film formed on a cathode surface to improve thermal stability of the battery, thereby improving safety of the battery.

Abstract: Provided is a battery capable of obtaining a superior battery capacity and a superior charge-discharge cycle characteristic under high temperature conditions, and improving a load characteristic. A laminate including a cathode (21) and an anode (22) with a separator (23) in between is spirally wound. The cathode (21) includes a cathode mixture layer which includes a lithium-containing complex oxide including at least one kind selected from the group consisting of Co, Ni, Mn and Fe. The anode (22) includes an anode mixture layer including a tin-containing alloy, a carbon material, and a fatty acid or a metal salt thereof. Thereby, a superior battery capacity and a superior charge-discharge cycle characteristic under high temperature conditions can be obtained. Moreover, when the content of the fatty acid or the metal salt thereof in the anode mixture layer is within a range from 0.1 wt % to 6 wt % inclusive, a load characteristic can be improved.

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: A nonaqueous electrolytic solution comprising an electrolyte salt dissolved in an organic solvent is disclosed. The nonaqueous electrolytic solution contains a silicon compound represented by formula (I): wherein R1 represents an alkenyl group having 2 to 10 carbon atoms; R2 and R3 each represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or a halogen atom; and X represents a halogen atom.

Abstract: A novel liquid-crystalline ionic conductor, which is useful in the electric, electronic, chemical and bioengineering fields, as an anisotropic reaction solvent, ionic conductor, electric field-responsible conductor or the like, and a method for producing the same, is provided. The liquid-crystalline ionic conductor is obtained by mixing an organic molten salt with a-liquid-crystalline organic molecule or a liquid-crystalline inorganic molecule, which comprises a moiety miscible to the organic molten salt and a moiety that shows liquid-crystalline orientation, thereby forming a liquid-crystalline ionic conductor, wherein the organic molten salt is assembled to the liquid-crystalline molecule.

Abstract: Provided is an organic electrolytic solution including a lithium salt and an organic solvent containing an alkoxy-containing compound such as 1,1,3-trimethoxypropane. When polyglyme and an organic compound having dioxolane moiety are further added into the organic electrolytic solution, a lithium metal stabilizing effect and the ionic conductivity of lithium ions are enhanced, and thus, the charging/discharging efficiency of lithium is greatly improved. Such an organic electrolytic solution can be effectively used for any kind of lithium batteries and lithium sulfur batteries, even whose which use a lithium metal anode.

Abstract: An ionic conductor, such as a proton conductor, a process for production thereof, and an electrochemical device, such as fuel cell, that includes the ionic conductor is provided. The ionic conductor of the present invention is formed from a polymer in which carbon clusters having ion dissociating functional groups are bonded to each other through connecting groups which can also include one or more ion dissociating functional groups. In this regard, the polymer is less water-soluble and more chemically stable than a derivative composed solely of carbon clusters, thus displaying enhanced ionic conduction properties.

Abstract: Disclosed are non-aqueous electrolyte compositions of the present invention that comprise non-aqueous solvents and monomers such as aniline, phenanthrene, ethylenedioxythiophene, benzothiophene or derivatives thereof. The monomers are contained in the electrolytes of the present invention in the amounts of less than about 5.0 weight percent of the non-aqueous solvent. In the present invention, cyclic carbonates, linear carbonates or mixtures thereof can be used as the non-aqueous solvents. The electrolyte compositions of the present invention improve the safety characteristics of the cell by preventing the flow of large currents resulting from overcharge or feed-through, and also improve cell life characteristic by helping the reversible transfer of lithium ions.

Abstract: A non-aqueous electrolyte solution that contains an organic solvent, and a lithium salt and an electrolyte, that is useful for the preparation of a secondary battery that is equipped with a negative electrode and a positive electrode, each of which is capable of storing and releasing lithium, wherein the non-aqueous electrolyte solution contains partially hydrogenated terphenyl that is a mixture of two or more compounds of which one is diphenylcyclohexane that is present in an amount ranging from 10 to 65 wt % of the partially hydrogenated terphenyl and the partially hydrogenated terphenyl has a solubility of not less than 0.5 wt % in the electrolyte solution at room temperature.

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-tolydisulfide and bis(4-methoxyphenyl)disulfide as 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: A method for adhesion of wound electrodes or electrode lamination for use in a lithium-ion secondary battery, comprising acts of dissolving a polymer applied on electrode sheets in a selected solvent; applying the solvent containing polymer on surfaces of the electrode sheets; and vaporizing the solvent by heating to laminate electrode sheets together is disclosed.

Abstract: The present invention relates to acids of the general formula [I], [RyPF6-y]?H+ [I], where y=1, 2 or 3, and in which the ligands R may be identical or different and R is a perfluorinated C1-8-alkyl or aryl group or R is a partially fluorinated C1-8-alkyl or aryl group, in which some of the F or H may have been substituted by chlorine. The present invention furthermore relates to a process for the preparation of the acids according to the invention, to salts comprising a cation and the anion of the acid according to the invention, and to a process for the preparation of the salts. The invention furthermore relates to the use of the acids and salts according to the invention.

Abstract: An object of the invention is to provide such a battery that has a high capacity, is excellent in storage characteristics, cycle characteristics and continuous charging characteristics, and is small in gas generation amount, whereby size reduction and improvement in performance of a lithium secondary battery can be attained. The present invention relates to a nonaqueous electrolytic solution comprising a lithium salt and a nonaqueous solvent dissolving the same, wherein the electrolytic solution contains, as the lithium salt, LiPF6 in a concentration of from 0.2 to 2 mole/L, and LiBF4 and/or a compound represented by the following formula (1) in a molar ratio of from 0.005 to 0.4 with respect to LiPF6, and the nonaqueous solvent mainly comprises (1) ethylene carbonate and/or propylene carbonate, (2-1) a symmetric linear carbonate, (2-2) an asymmetric linear carbonate, and (3) vinylene carbonate.

Abstract: The present invention provides a lithium secondary battery comprising a nonaqueous electrolytic solution containing a compound which is oxidized at a voltage higher than a charge end voltage of the lithium secondary battery and a compound which inhibits reactions at voltages lower than said charge end voltage.

Abstract: The present invention provides an additive which is able to make a non-aqueous-electrolyte secondary cell or a non-aqueous electrolyte electric double layer capacitor which is excellent in low-temperature characteristics, while maintaining a necessary cell properties, and a non-aqueous-electrolyte secondary cell or a non-aqueous electrolyte electric double layer capacitor that contains therein the additive. The additive contains at least one of tautomers of phosphazene derivatives represented by formulae (1) and (2): wherein R1, R2 and R3 independently represent a monovalent substituent or a halogen element; X represents a substituent containing at least one selected from a group of carbon, silicon, germanium, tin, nitrogen, phosphorus, arsenic, antimony, bismuth, oxygen, sulfur, selenium, tellurium and polonium; and Y1 and Y2 independently represent a divalent connecting group, a divalent element or a single bond.

Abstract: An electrolyte for a lithium secondary battery comprises lithium salts, a non-aqueous organic solvent, and an additive compound of formula (1): where R1 to R10 are independently selected from the group consisting of a hydrogen, alkyl, alkenyl, and alkynyl. The additive compound decomposes earlier than organic solvent to form an SEI film, and prevents decomposition of the organic solvent.