Patent ID: 10270084

Abstract:
An object is to provide a lithium ion battery excellent in input/output characteristics, cycle life characteristics, and safety. The lithium ion battery is a lithium ion battery including, in a battery container, an electrolyte solution and an electrode group in which a positive electrode and a negative electrode are disposed through a separator. A lithium-nickel-manganese-cobalt composite oxide having a layered crystal structure is contained as a positive electrode active material, an easily graphitizable carbon is contained as a negative electrode active material, a weight of the easily graphitizable carbon heated at 550° C. in dry air flow in thermogravimetric analysis is equal to more than 75% of a weight of the easily graphitizable carbon heated at 25° C. therein, and a weight of the easily graphitizable carbon heated at 650° C. therein is equal to or less than 20% of the weight of the easily graphitizable carbon heated at 25° C. therein.