Abstract: An electrolyte solution according to one aspect of the present disclosure comprises water, a lithium salt, and a polycarboxylic acid having two or more carboxylic acid groups. A secondary battery according to one aspect of the present disclosure comprises a positive electrode, a negative electrode, and the electrolyte solution.

Abstract: A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including an additive. The positive electrode active material includes a compound having a crystal structure belonging to a space group FM3-M and represented by Compositional Formula (1): LixMeyO?F?, where, Me is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and Cr; and subscripts x, y, ?, and ? satisfy the following requirements: 1.7?x?2.2, 0.8?y?1.3, 1???2.5, and 0.5???2. The additive is at least one selected from dinitrile compounds and diisocyanate compounds.

Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode mixture including a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, carbon nanotubes, and a binder. The negative electrode active material includes a silicon-containing material, and the binder includes an acrylic polymer. The polymer includes a hydrophilic structural unit having a carboxyl group, and a hydrophobic structural unit.

Abstract: A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including a lithium hexafluorophosphate and an additive. The positive electrode active material includes a compound having a crystal structure belonging to a space group FM3-M and represented by Compositional Formula (1): LixMeyO?F?. The additive is at least one selected from the group consisting of difluorophosphates, tetrafluoroborates, bis(oxalate)borate salts, bis(trifluoromethanesulfonyl)imide salts, and bis(fluorosulfonyl)imide salts.

Abstract: A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including a nonaqueous solvent. The positive electrode active material includes a compound having a crystal structure belonging to a space group FM3-M and represented by Compositional Formula (1): LixMeyO?F?, where, Me is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and Cr; and subscripts x, y, ?, and ? satisfy the following requirements: 1.7?x?2.2, 0.8?y?1.3, 1???2.5, and 0.5???2. The nonaqueous solvent includes a solvent having at least one fluoro group.

Abstract: A rechargeable battery including a positive electrode, a negative electrode, and an electrolyte solution is provided. The electrolyte solution contains water and one or more lithium salts, and the lithium salts include lithium fluorophosphate.

Abstract: This negative electrode for secondary batteries is provided with a negative electrode mixture that contains a negative electrode active material, an additive and a conductive agent. The negative electrode active material contains an Si-containing material; the additive contains an alkali metal sulfate salt; and the conductive agent contains carbon nanotubes. The content of the alkali metal sulfate salt in the negative electrode mixture is from 0.0025% by mass to 0.1% by mass relative to the total mass of the negative electrode active material.

Abstract: An electrochemical element includes a current collector, and an active material layer supported on the current collector, wherein the active material layer includes active material particles, the active material particles each include lithium silicate composite particles each including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, and a first coating that covers at least a portion of a surface of the lithium silicate composite particles, the first coating includes an oxide of a first element other than a non-metal element, the active material layer has a thickness TA, and T1b > T1t is satisfied, where T1b is a thickness of the first coating that covers the lithium silicate composite particles at a position of 0.25TA from the surface of the current collector in the active material layer, and T1t is a thickness of the first coating that covers the lithium silicate composite particles at a position of 0.

Abstract: Provided is a battery including: a positive electrode containing a positive electrode active material; a negative electrode; and an electrolyte solution containing a nonaqueous solvent. The positive electrode active material contains a compound represented by composition formula (1) below and having a crystal structure belonging to space group FM3-M: LixMeyO?F?. (1) Here, Me is one or two or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and C. x, y, ?, and ? satisfy the following conditions: 1.7?x?2.2, 0.8?y?1.3, 1???2.5, and 0.5???2, respectively. The nonaqueous solvent includes at least one solvent selected from hydrofluoroethers, phosphazenes, phosphates, and perfluoropolyethers.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a lithium ion conductive nonaqueous electrolyte, wherein the negative electrode contains graphite, an open circuit potential of the negative electrode in a fully charged state is 70 mV or less relative to lithium metal, the nonaqueous electrolyte contains a solvent, a cation, and an anion, the solvent contains a fluorine-containing cyclic carbonic acid ester, the cation includes lithium ions, and the anion includes an oxalate complex anion.

Abstract: A non-aqueous electrolyte secondary battery with a negative electrode active material including a carbon material, and a silicon-containing material in which Si particles are dispersed in a lithium ion conductive phase. The negative electrode material mixture layer having a thickness T0 includes a first region on the negative electrode surface side having a thickness of T1, and a second region on the negative electrode current collector side, and the ratio T1/T0 is 1/20 to 19/20. The ratio of a mass ratio MS1 of the silicon-containing material in the first region to a mass ratio MS2 of the silicon-containing material in the second region is not less than 0 and less than 1. An open circuit potential of the negative electrode in a fully charged condition is higher than 0 mV and 70 mV or lower relative to lithium metal.

Abstract: A secondary battery according to the present invention is provided with a positive electrode, a negative electrode and an electrolyte solution; the electrolyte solution contains water and a lithium salt; the negative electrode contains a negative electrode active material; a silane coupling agent, which is reductively decomposed at a potential that is higher than the reductive decomposition potential of water, is adhered to the surface of the negative electrode active material; and the silane coupling agent contains fluorine as a constituent element.

Abstract: A non-aqueous electrolyte secondary battery, wherein a negative electrode includes a negative electrode mixture layer having a thickness T and a negative electrode current collector, the negative electrode active material includes carbon and Si-containing materials, wherein when the negative electrode mixture layer is divided into a first region having a thickness of T/2 on the surface side of the negative electrode and a second region having a thickness of T/2 on the negative electrode collector side, a mass ratio of the first to the second composite material contained in the first region is >1, a mass ratio of the first composite to the second composite material contained in the second region is <1, and, in a fully charged condition, an open circuit potential of the negative electrode is 0 V or more and 70 mV or less with respect to a lithium metal.

Abstract: This positive electrode active material is represented by general formula LiaNixCoyMnzMbO2 wherein 0.9<a<1.1, 0.4<x<1, 0?y<0.4, 0?z<0.4, 0?b<0.2 and 0.9<(x+y+z+b)<1.1 are satisfied, and the element M contains at least one element that is selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Ga and In.

Abstract: A positive electrode active material that is represented by the general formula LixM1-yLyO2 (wherein 0.9?x?1.1, 0?y<0.6, the element M is at least one element selected from the group that consists of Ni and Co, and the element L is at least one element selected from the group that consists of alkali earth elements, transition metal elements other than Ni and Co, rare earth elements, group IIIB elements, and group IVB elements). A surface layer part of the positive electrode active material includes an oxide of an element Me that is at least one element selected from the group that consists of B, Si, P, Ti, V, Mn, Al, Mg, Ca, Zr, W, Nb, Ta, In, Mo, and Sn.

Abstract: A positive electrode active material that is a composite oxide that is represented by the general formula LiaNixCoyMnzMbO2, wherein 0.9<a<1.1, 0.4?x<1.0, 0?y<0.4, 0?z<0.4, 0?b<0.2, 0.9<(x+y+z+b)<1.1, and the element M includes at least one element from the group that consists of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Ga, and In. The ratio (B/A) of BET specific surface area (A) before particle compression testing and BET specific surface area (B) after particle compression testing of the composite oxide particles is 1.0-3.0.

Abstract: A nonaqueous electrolyte includes a nonaqueous solvent and an alkali metal salt dissolved in the nonaqueous solvent. The nonaqueous solvent contains a perfluoropolyether and a nitrile compound represented by a formula Rf—CN, where Rf represents a hydrocarbon group which has a carbon number of 2 to 4 and in which at least one hydrogen atom is substituted with fluorine.

Abstract: An electrolyte solution according to one aspect of the present disclosure comprises water, a lithium salt, and a polycarboxylic acid having two or more carboxylic acid groups. A secondary battery according to one aspect of the present disclosure comprises a positive electrode, a negative electrode, and the electrolyte solution.

Abstract: An aqueous rechargeable battery includes: a positive electrode including a positive electrode current collector and a positive electrode active material layer provided on a surface of the positive electrode current collector; a negative electrode including a negative electrode current collector and a negative electrode active material layer provided on a surface of the negative electrode current collector; and an aqueous electrolyte solution containing a lithium salt and water. The positive electrode active material layer contains one or more positive electrode active materials and one or more lithium ion-conducting solid electrolytes; and the positive electrode active materials include a lithium transition metal oxide.

Abstract: A rechargeable battery including a positive electrode, a negative electrode, and an electrolyte solution is provided. The electrolyte solution contains water and one or more lithium salts, and the lithium salts include lithium fluorophosphate.