NONAQUEOUS ELECTROLYTE SOLUTION FOR SECONDARY BATTERY AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Disclosed is a nonaqueous electrolyte solution which is used in a nonaqueous electrolyte secondary battery comprising a positive electrode having a positive electrode active material capable of adsorbing/desorbing metal ions and a negative electrode having a negative electrode active material containing at least one atom selected from the group consisting of Si, Sn and Pb. This nonaqueous electrolyte solution contains an electrolyte, a nonaqueous solvent, and additionally an isocyanate compound having at least one aromatic ring in a molecule. Consequently, the nonaqueous electrolyte solution is effective for improving cycle characteristics.