PROCESS FOR PRODUCING DIFLUOROPHOSPHATE, NONAQUEOUS ELECTROLYTE FOR SECONDARY BATTERY, AND NONAQUEOUS- ELECTROLYTE SECONDARY BATTERY

摘要

Provided is a nonaqueous electrolyte for a secondary battery which comprises a nonaqueous solvent containing at least a hexafluorophosphate as an electrolyte lithium salt; a difluorophosphate; and carbon dioxide. Also provided is a nonaqueous-electrolyte secondary battery comprising the above nonaqueous electrolyte together with a negative electrode capable of occluding and releasing lithium ions and a positive electrode.