Abstract: An object of the present invention is to provide a secondary battery having high energy density with long-term life. The present invention relates to a secondary battery comprising a negative electrode comprising a silicon-containing compound and an electrolyte solution comprising a fluorine-containing ether compound, a fluorine-containing phosphoric acid ester, a sulfone compound and a cyclic carbonate compound in a predetermined amount respectively.

Abstract: The purpose of the present invention is to provide a lithium secondary battery which has improved service life characteristics by suppressing a decomposition reaction of the electrolyte solution in the field of batteries that operate at high voltages or are assumed to be used at high temperatures for a long period of time. The present invention relates to an electrolyte solution for a secondary, which is characterized by containing a sulfone compound, a fluorine-containing cyclic acetal compound and a cyclic carbonate in a specific composition; and a secondary battery which uses this electrolyte solution for a secondary battery.

Abstract: The purpose of the present embodiment is to provide a lithium secondary battery which is assumed to be operated at a high voltage or to be used at high temperatures for a long period of time, and which has improved life characteristics by suppressing a decomposition reaction of the electrolyte solution. The present embodiment relates to an electrolyte solution for a secondary battery containing a sulfone compound, a fluorine containing ether and an acid anhydride at a specific composition, and a secondary battery which uses this electrolyte solution for a secondary battery.

Abstract: The present invention is a lithium ion secondary battery comprising a positive electrode and a non-aqueous electrolyte solution comprising a non-aqueous electrolyte solvent, wherein the positive electrode comprises a positive electrode active material having an operating potential at 4.5 V or higher versus lithium metal, the non-aqueous electrolyte solvent comprises a fluorinated phosphate ester represented by a predetermined formula and at least one selected from the group consisting of sulfone compounds represented by predetermined formulae, and the sulfone compound is included in an amount of 5 volume % or more in the non-aqueous electrolyte solvent.

Abstract: An embodiment of the present invention relates to a lithium secondary battery comprising a nonaqueous electrolytic solution comprising a phosphate compound represented by the following general formula (1): O?P(O—R1)(O—R2)(O—R3) (1), wherein R1, R2, and R3 are each alkyl group or the like or a group comprising an ether bond represented by —R4—O—R5 (R4 represents alkylene group, and R5 represents alkyl group), and at least one of R1, R2, and R3 is a group comprising an ether bond, and at least one of R1, R2, and R3 contains fluorine, and a positive electrode active material having a charge and discharge region of 4.5 V or more versus lithium.

Abstract: A lithium secondary battery including a positive electrode including a positive electrode active material capable of intercalating and deintercalating lithium ions, a negative electrode including a negative electrode active material capable of intercalating and deintercalating lithium ions, and a nonaqueous electrolytic solution, wherein the positive electrode active material includes an active material capable of intercalating or deintercalating lithium ions at a potential of 4.5 V or more, and the nonaqueous electrolytic solution includes a particular fluorine-containing ether compound.

Abstract: A secondary battery having an improved life characteristics is provided by the use of a positive electrode active material for a secondary battery, comprising (a) a surface layer comprising a lithium metal composite oxide having a spinel crystal structure represented by space group Fd-3m, and (b) an internal portion comprising a lithium metal composite oxide having a spinel crystal structure represented by space group P4332.

Abstract: The object of the present invention is to provide an electrolyte solution for secondary batteries, which improves the cycle characteristics of a secondary battery operating at a high potential and used at a high temperature for a long time. The present invention relates to an electrolyte solution for secondary batteries comprising lithium difluorophosphate, a fluorine containing ether compound and a fluorine containing phosphate ester compound and/or a sulfone compound.

Abstract: The present invention relates to a lithium secondary battery, comprising a positive electrode; a negative electrode; and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution contains a phosphate polymer represented by the following formula (1): wherein R1 to R5 each independently represents aliphatic hydrocarbon group or fluorinated aliphatic hydrocarbon group, wherein the group may have a substituent, and n represents an integer of 1 or more, with the proviso that when n is 2 or more, two or more R1(s) may be the same as, or different from each other and two or more R4(s) may be the same as, or different from each other; and a fluorinated phosphate represented by the following formula (2): wherein R6 to R8 each independently represents aliphatic hydrocarbon group or fluorinated aliphatic hydrocarbon group, wherein the group may have a substituent, with the proviso that at least one of R6 to R8 is fluorinated aliphatic hydrocarbon group.

Abstract: A lithium ion secondary battery excellent in cycle characteristics and rate characteristics is provided. The present invention relates to a lithium secondary battery having an electrolyte solution comprising one or more compounds selected from a fluorinated ether and a fluorinated phosphate ester and a separator comprising an aramid resin.

Abstract: The present invention relates to a secondary battery cg a positive electrode capable of absorbing and releasing lithium, and a electrolyte solution containing a non-aqueous electrolytic solvent, wherein the positive electrode has a positive electrode active material which operates at 4.5 V or more relative to lithium, and wherein the non-aqueous electrolytic solvent contains a sulfone compound represented by a predetermined formula and a fluorinated ether compound represented by a predetermined formula.

Abstract: An electrode for a lithium ion secondary battery comprising a binder comprising a vinyl chloride resin (PVC) and a polyvinylidene fluoride (PVDF), wherein the weight ratio of the PVC and the PVDF is PVC:PVDF=8:2 to 3:7, and at least one of the following (a) and (b) is satisfied: (a) the polymerization degree of the PVC is 900 or more, and (b) the polymerization degree of the PVDF is 5000 or more.

Abstract: An objective of the present invention is to provide an electrolyte solution effective for reducing the amount of gas generated in a charge-discharge cycle of a lithium-ion secondary battery, preferably a lithium-ion secondary battery using a 5 V-class positive electrode. The present invention relates to a non-aqueous electrolyte solution comprising at least one type of aniline derivative represented by a predetermined formula, and a non-aqueous solvent, and to a lithium-ion secondary battery using the same.

Abstract: An object of the present invention is to provide a secondary battery having high energy density with long-term life. The present invention relates to a secondary battery comprising a negative electrode comprising a silicon-containing compound and an electrolyte solution comprising a fluorine-containing ether compound, a fluorine-containing phosphoric acid ester, a sulfone compound and a cyclic carbonate compound in a predetermined amount respectively.

Abstract: An object of the present invention is to provide a battery system improved in output characteristics and/or storage characteristic while taking advantage of high energy density of a lithium ion secondary battery comprising a positive electrode containing a positive electrode active material having an operating potential of 4.5 V or more relative to a lithium metal. The present invention relates to a battery system having a first battery consisting of a 5 V-level battery(s), a second battery consisting of a 4 V-level battery(s), and a control system.

Abstract: The present invention relates to a positive electrode comprising a Mn composite oxide having a tetragonal structure represented by formula (1): Lia(MxMn2-x-yYy)(O4-wZw)(wherein 1<a?2.6, 0?x?1.2, 0?y, x+y<2, 0?w?1; M is at least one selected from the group consisting of Co, Ni, Fe, Cr and Cu; Y is at least one selected from the group consisting of Li, B, Na, Mg, Al, Ti, Si, K and Ca; Z is at least one of F or Cl; and a composite oxide having a layered structure represented by formula (2): Li(LixM1-x-yYy)O2 (wherein 0?x<0.3, 0?y<0.3; M is at least one selected from the group consisting of Co, Fe, Ni and Mn; Y is at least one selected from the group consisting of Mg, Al, Zr, Ti and Zn. According to the present invention, a lithium secondary battery having a high capacity and being excellent in cycle life can be provided.

Abstract: It is an object of this exemplary embodiment to provide a lithium ion secondary battery using a positive electrode active material having an operating potential of 4.5 V or more, the lithium ion secondary battery having excellent high temperature cycle characteristics. This exemplary embodiment is a lithium ion secondary battery comprising a positive electrode and a negative electrode capable of intercalating and deintercalating lithium, a separator between the positive electrode and the negative electrode, and an electrolytic solution containing a nonaqueous electrolytic solvent, wherein the positive electrode comprises a positive electrode active material operating at a potential of 4.5 V or more versus lithium, the separator comprises cellulose, a cellulose derivative, or a glass fiber, and the nonaqueous electrolytic solvent comprises a fluorinated solvent.

Abstract: It is an object of this exemplary embodiment to provide a lithium ion secondary battery using a positive electrode active material having an operating potential of 4.5 V or more, the lithium ion secondary battery having excellent high temperature cycle characteristics. This exemplary embodiment is a lithium ion secondary battery comprising a positive electrode and a negative electrode capable of intercalating and deintercalating lithium, a separator between the positive electrode and the negative electrode, and an electrolytic solution containing a nonaqueous electrolytic solvent, wherein the positive electrode comprises a positive electrode active material operating at a potential of 4.5 V or more versus lithium, the separator comprises cellulose, a cellulose derivative, or a glass fiber, and the nonaqueous electrolytic solvent comprises a fluorinated solvent.

Abstract: The present invention provides a lithium ion secondary battery having excellent high temperature cycle characteristics. The present invention relates to an electrolyte solution containing a non-aqueous electrolyte solvent containing two or more open chain sulfone compounds represented by a specific formula and one or more carbonate ester compounds represented by a specific formula; and to a secondary battery comprising these.

Abstract: The present invention relates to a nonaqueous electrolyte solution comprising a nonaqueous electrolyte solvent which comprises a fluorine-containing phosphate ester represented by a specific formula, a fluorine-containing ether represented by a specific formula, and an open-chain or cyclic acid anhydride. According to the present invention, there is provided an electrolyte solution capable of realizing a lithium secondary battery having an excellent cycle characteristics with little gas generation after charge-discharge cycles.