Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material particle. The positive electrode active material particle includes a layered rock-salt lithium composite oxide and a spinel metal oxide. The positive electrode active material particle has therein the spinel metal oxide provided on at least a surface of a particle including the layered rock-salt lithium composite oxide. The electrolytic solution includes a chain carboxylic acid ester and a cyclic ether.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a diester compound and a sulfur-containing compound. The diester compound includes two or more of a compound represented by Formula (1), a compound represented by Formula (2), or a compound represented by Formula (3). The sulfur-containing compound includes at least one of propane sultone, 1,4-butane sultone, 2,4-butane sultone, propene sultone, glycol sulfate, propylene glycol sulfate, dimethyl sulfate, diethyl sulfate, ethyl methyl sulfate, or sulfolane.

Abstract: Provided is a non-aqueous electrolyte secondary battery capable of achieving both load characteristics and cycle characteristics. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolytic solution. The negative electrode includes a negative electrode active material layer including acrylonitrile-styrene-butadiene rubber. The non-aqueous electrolytic solution includes a propionic acid ester, a halogenated cyclic carbonic acid ester, and at least one of predetermined cyclic sulfuric acid anhydrides. A content of the acrylonitrile-styrene-butadiene rubber in the negative electrode active material layer is 0.5 mass% or more and 2.0 mass% or less.

Abstract: The secondary battery includes an electrolytic solution, a positive electrode and a negative electrode, and the negative electrode includes a plurality of particulate negative electrode active materials, a first negative electrode binder, and a plurality of second negative electrode binders with an average particle size smaller than the plurality of particulate negative electrode active materials. The plurality of particulate negative electrode active materials have an average particle size of 5 ?m or more and 30 ?m or less. The first negative electrode binder includes one or both of a styrene butadiene rubber and a derivative thereof. The plurality of second negative electrode binders include one or both of a polyvinylidene fluoride and a derivative thereof, and the plurality of second negative electrode binders have an average particle size of 0.1 ?m or more and 10 ?m or less.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a solvent, an electrolyte salt, a diester compound represented by Formula (1), and at least one of respective sulfur-containing compounds represented by Formulae (2) to (14).

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a lithium-nickel composite oxide. The negative electrode includes a lithium-titanium composite oxide. The electrolytic solution includes a dinitrile compound and a carboxylic acid ester. A ratio of a capacity per unit area of the positive electrode to a capacity per unit area of the negative electrode is greater than or equal to 100% and less than or equal to 120%. A ratio of a number of moles of the dinitrile compound to a number of moles of the carboxylic acid ester is greater than or equal to 1% and less than or equal to 4%.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution including a carbonic acid ester compound.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material particle. The positive electrode active material particle includes a layered rock-salt lithium composite oxide and a spinel metal oxide. The positive electrode active material particle has therein the spinel metal oxide provided on at least a surface of a particle including the layered rock-salt lithium composite oxide. The electrolytic solution includes a chain carboxylic acid ester and a cyclic ether.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a sulfur-phosphorus-containing compound.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a solvent and an electrolyte salt. The solvent includes a first ester compound and a second ester compound. The first ester compound is represented by R1-C(?O)—OR2, where each of R1 and R2 represents a first alkyl group, R1 has carbon number from 1 to 3 both inclusive, and the sum of the carbon number of R1 and the carbon number of R2 is from 3 to 5 both inclusive. The second ester compound is represented by R3O—FP(?O)—OR4, where each of R3 and R4 represents a second alkyl group, and the sum of the carbon number of R3 and the carbon number of R4 is from 2 to 10 both inclusive. The content of the first ester compound in the solvent is 30 vol % or more.

Abstract: Provided is a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode has a positive active material layer including a fluorine-based binder having a melting point of 166° C. or lower, a content of the fluorine-based binder in the positive active material layer is from 0.5 mass % to 2.8 mass %, the electrolytic solution includes at least a first additive selected from 1,3-dioxane and a 1,3-dioxane derivative thereof, and a content of the first additive in the electrolytic solution is from 0.1 mass % to 2 mass %.

Abstract: A battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer including a fluorine-based binder having a melting point of 166° C. or less. The content of the fluorine-based binder in the positive electrode active material layer is from 0.7% by mass to 2.8% by mass. The electrolytic solution includes a carboxylic acid ester, and the carboxylic acid ester has 4 or more and 10 or less carbon atoms.

Abstract: The secondary battery includes an electrolytic solution, a positive electrode and a negative electrode, and the negative electrode includes a plurality of particulate negative electrode active materials, a first negative electrode binder, and a plurality of second negative electrode binders with an average particle size smaller than the plurality of particulate negative electrode active materials. The plurality of particulate negative electrode active materials have an average particle size of 5 ?m or more and 30 ?m or less. The first negative electrode binder includes one or both of a styrene butadiene rubber and a derivative thereof. The plurality of second negative electrode binders include one or both of a polyvinylidene fluoride and a derivative thereof, and the plurality of second negative electrode binders have an average particle size of 0.1 ?m or more and 10 ?m or less.