LITHIUM ION BATTERY

摘要

Provided is a lithium ion battery which has achieved improved safety without deteriorating the capacity characteristics and service life characteristics. An electrode group (7) is configured by arranging a positive electrode plate (1) that contains a positive electrode active material and a negative electrode plate (3) that contains a negative electrode active material, with a separator (5) being interposed therebetween. The electrode group (7) is wound around an axial core (9) and contained in a battery can (11). A flameproofing agent is contained in or coated over the axial core (9) and/or the battery can (11).