Lg Energy Solution, Ltd.

Hitachi Chemical Company, Ltd.

Showa Denko Materials Co., Ltd.

Yuma Gogyo

Takuya Nishimura

Nobuyuki Ogawa

Hiroki Mikuni

Hideyuki Ogawa

Kenji Takaoka

Katsunori Nishimura

Miyuki Muromachi

Provided is an electrolyte composition, comprising one or two or more polymers, oxide particles, at least one electrolyte salt selected from the group consisting of a lithium salt, a sodium salt, a calcium salt, and a magnesium salt, and a solvent, wherein structural units constituting the one or two or more polymers comprises a first structural unit selected from the group consisting of tetrafluoroethylene and vinylidene fluoride, and a second structural unit selected from the group consisting of hexafluoropropylene, acrylic acid, maleic acid, ethyl methacrylate, and methyl methacrylate, a content of the one or two or more polymers is more than 90% by mass based on a total amount of polymers in the electrolyte composition, and a mass ratio of a content of the first structural unit to a content of the second structural unit in the one or two or more polymers is 50/50 or more.

Electrolyte composition, secondary cell, and method for manufacturing electrolyte sheet

A lithium ion secondary battery includes a positive electrode containing a spinel-type lithium-nickel-manganese composite oxide as a positive electrode active material; a negative electrode containing, as a negative electrode active material, an active material in which introduction and release of lithium ions take place at a potential of 1.2 V or higher relative to a lithium potential; a separator inserted between the positive electrode and the negative electrode; and an electrolytic solution, wherein a capacity ratio of a negative electrode capacity of the negative electrode to a positive electrode capacity of the positive electrode (negative electrode capacity/positive electrode capacity) is 1 or lower, and the electrolytic solution contains dimethyl carbonate as a non-aqueous solvent at a content ratio of higher than 70% by volume with respect to a total amount of the non-aqueous solvent.

Lithium ion secondary battery

A lithium-ion battery includes: a cathode; an anode; and a non-aqueous electrolyte solution, in which the cathode includes a current collector and a cathode mixture applied on at least one side of the current collector, the cathode mixture includes a lithium transition metal oxide as a cathode active material, the anode includes a lithium titanium complex oxide as an anode active material, and the non-aqueous electrolyte solution includes a fluorine-containing boric acid ester.

Lithium-ion battery

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Tokyo, Japan

Yuma Gogyo