NONAQUEOUS ELECTROLYTE AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Disclosed is a nonaqueous electrolyte secondary battery wherein safety during overcharge is further improved. Specifically disclosed is a nonaqueous electrolyte secondary battery having such a structure that an electrode group (3) including a positive electrode (10), a negative electrode (11) and a separator (12) is arranged within a space hermetically sealed by a container body (2) and a covering plate (4), and a nonaqueous electrolyte is injected into the electrode group(3). In this secondary battery, it is used a nonaqueous electrolyte obtained by dissolving an electrolyte in a nonaqueous solvent which contains halogenated benzenes while having the aminated benzene content, as impurities, of less than 100 ppm.