Mitsubishi Chemical Corporation

Kanako Ito

Takeshi Nakamura

Takashi Fujii

Hiromu Watanabe

Ryo Yamaguchi

Shuhei Sawa

Koji Fukamizu

Hideaki Takahashi

A nonaqueous electrolytic solution, containing an electrolyte, a nonaqueous solvent and an aromatic carboxylate ester of formula (): 

Nonaqueous electrolytic solution and nonaqueous electrolyte secondary battery using the same

A nonaqueous electrolytic solution, containing an electrolyte, a nonaqueous solvent, an aromatic carboxylate ester and a compound is provided. The compound is fluorine-containing cyclic carbonates, sulfur-containing organic compounds, phosphonate esters, cyano group-containing organic compounds, isocyanate group-containing organic compounds, silicon-containing compounds, aromatic compounds, cyclic compounds having a plurality of ether bonds, monofluorophosphate salts, difluorophosphate salts, borate salts, oxalate salts or fluorosulfonate salts.

An object of the invention is to provide nonaqueous electrolyte batteries having high initial efficiency, excellent initial capacity and excellent overcharge safety, and nonaqueous electrolytic solutions realizing such batteries. A nonaqueous electrolytic solution includes an electrolyte and a nonaqueous solvent, and further includes an aromatic compound represented by Formula (I) (in which Rto Rare independently hydrogen, a halogen, or an unsubstituted or halogen-substituted hydrocarbon group having 1 to 20 carbon atoms, Rand Rare independently a hydrocarbon group having 1 to 12 carbon atoms, at least two of Rto Rmay be bonded together to form a ring, and Formula (I) satisfies at least one of the requirements (A) and (B): (A) at least one of Rto Ris a halogen, or an unsubstituted or halogen-substituted hydrocarbon group having 1 to 20 carbon atoms, (B) the total number of carbon atoms in Rto Ris 3 to 20). A nonaqueous electrolyte battery includes the nonaqueous electrolytic solution.

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Inashiki-gun, Japan

Kanako Ito