NONAQUEOUS ELECTROLYTE SOLUTION FOR BATTERY AND LITHIUM SECONDARY BATTERY

Provided is a nonaqueous electrolyte solution for batteries, which contains an additive A that is composed of a boron compound represented by formula (1), and an additive B that has a lower reductive decomposition potential than the Additive A, in which n represents an integer from 1 to 5, M represents an Li ion or an H ion, and when n is an integer from 2 to 5, more than one M may be the same as or different from each other.