METHOD FOR PRODUCING LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

摘要

A lithium ion secondary battery, which is provided with a multilayer electrode body (1) wherein a positive electrode (2) and a negative electrode (3) containing an active material that is capable of absorbing and desorbing lithium are arranged to face each other, is produced by a method that comprises a step wherein a lithium source having a surface layer that contains 30% by mass or more of lithium nitride is brought into contact with the negative electrode active material. The thus-obtained lithium ion secondary battery has high energy density and good cycle characteristics.