Patent ID: 9490474
Filing Date: 2016-11-08
CPC Classification: H01M,Y02E,Y02P

Claim Text:
1. A method for manufacturing a positive electrode active material for an energy storage device, comprising the steps of: forming a mixture by mixing raw materials to be the positive electrode active material; performing a first baking on the mixture; grinding the mixture; adding a graphene oxide to the ground mixture; performing a second baking to form a reaction product, and to reduce the graphene oxide, whereby a surface of the reaction product is coated with graphene; and grinding the reaction product after the second baking to obtain the positive electrode active material, wherein the reaction product comprises lithium iron phosphate, lithium nickel phosphate, lithium cobalt phosphate, or lithium manganese phosphate, and wherein the graphene has an angle of greater than 0° and less than 3° with respect to a surface of the positive electrode active material.