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|1. (WO2017038406) NONAQUEOUS ELECTROLYTE SOLUTION FOR BATTERIES AND LITHIUM SECONDARY BATTERY|
|Applicants:||MITSUI CHEMICALS, INC.
|Title:||NONAQUEOUS ELECTROLYTE SOLUTION FOR BATTERIES AND LITHIUM SECONDARY BATTERY|
A nonaqueous electrolyte solution for batteries, which contains an additive (X) that is composed of at least one compound selected from the group consisting of lithium monofluorophosphate, lithium difluorophosphate and sulfonic acid ester compounds represented by formula (XA), and wherein the content of elemental copper relative to the total amount of the nonaqueous electrolyte solution for batteries is 0.001 ppm by mass or more but less than 5 ppm by mass. (In formula (XA), M represents a boron atom or a phosphorus atom; X represents a halogen atom; R represents an alkylene group having 1-10 carbon atoms, a halogenated alkylene group having 1-10 carbon atoms, an arylene group having 6-20 carbon atoms or a halogenated arylene group having 6-20 carbon atoms (and these groups may contain a substituent or a heteroatom in the structures); m represents an integer of 1-3; n represents an integer of 0-4; and q represents 0 or 1.)