Murata Manufacturing Co., Ltd.

Yusuke Morino

Izaya Okae

Kazumasa Takeshi

Kazunari Motohashi

Takumi Hiasa

Nobuhiro Inoue

Satoshi Umezu

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. A potential of the positive electrode, versus a lithium reference electrode, at a time of charging is higher than or equal to 4.50 V. The electrolytic solution includes a branched carboxylic acid ester compound.

Secondary battery

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution where (A) the electrolytic solution contains a solvent and an electrolyte salt, the solvent containing ethylene carbonate, (B) a content of the electrolyte salt is from 0.8 mol/kg to 2.0 mol/kg both inclusive, (C) a content of the ethylene carbonate in the solvent is from 10 wt % to 30 wt % both inclusive, (D) a ratio M2/M1 of a number M2 of moles of the ethylene carbonate to a number M1 of moles of the electrolyte salt is from 0.4 to 2.4 both inclusive, and (E) the electrolytic solution contains at least one of sulfone compounds.

Electrolyte for secondary battery, secondary battery, battery pack, electric vehicle, electric power storage system, electric tool and electronic device

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Kyoto, Japan

Yusuke Morino