PRODUCTION METHOD FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A production method for non-aqueous electrolyte secondary batteries comprises a conditioning step in which an electrode group having a positive electrode and a negative electrode wound around a separator is inserted inside a case, a non-aqueous electrolyte including an overcharge additive is injected and the case is sealed, after which a confining pressure is applied to the case, and charge/discharge is performed at least once. After initial charging in the conditioning step, a cracked section is formed in secondary particles of a positive electrode active material, and then a conductive film is formed on the cracked section.