NON-AQUEOUS ELECTROLYTE SOLUTION FOR SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY

摘要

To provide a flame-retardant non-aqueous electrolyte solution for secondary batteries, with which a lithium ion secondary battery excellent in the rate properties can be obtained; and a safe lithium ion secondary battery excellent in the rate properties.;A non-aqueous electrolyte solution for secondary batteries, comprising a lithium salt and a liquid composition, wherein
the liquid composition comprises at least one fluorine-containing solvent (α) selected from the group consisting of a fluorine-containing ether compound, a fluorine-containing chain carboxylic acid ester compound and a fluorine-containing chain carbonate compound, and a cyclic carboxylic acid ester compound,the lithium salt contains LiPF6, andthe lithium ion diffusion coefficient of the non-aqueous electrolyte solution at 25° C. is at least 1.1×10−10 m2/s.

主权项

1. A non-aqueous electrolyte solution for secondary batteries, comprising a lithium salt and a liquid composition, wherein
the liquid composition comprises a fluorine-containing solvent (α) containing at least one member selected from the group consisting of a fluorine-containing ether compound, a fluorine-containing chain carboxylic acid ester compound and a fluorine-containing chain carbonate compound, and a cyclic carboxylic acid ester compound, the lithium salt contains LiPF6, and the lithium ion diffusion coefficient of the non-aqueous electrolyte solution at 25° C. is at least 1.1×10−10 m2/s.