▎ 摘　　要

NOVELTY - Preparation method of lithium ion battery involves mixing a ternary material with a conductive agent and a high-molecular binder, coating the mixture on an aluminum foil, drying to obtain a positive plate, dispersing graphene oxide in a dispersant to obtain graphene oxide dispersion liquid, coating the graphene oxide dispersion liquid on the positive plate to form a graphene oxide coating to obtain graphene oxide-modified positive plate, assembling the graphene oxide-modified positive plate into a button cell in a glove box, and carrying out electrochemical reduction of the button cell. USE - Method is useful for the preparation of lithium ion battery (claimed). ADVANTAGE - The lithium ion battery has excellent electronic conductivity, cycle performance and magnification performance. DETAILED DESCRIPTION - Preparation method of lithium ion battery involves mixing a ternary material with a conductive agent and a high-molecular binder, coating the mixture on an aluminum foil, drying to obtain a positive plate, dispersing graphene oxide in a dispersing agent to obtain graphene oxide dispersion liquid, coating the graphene oxide dispersion liquid on the positive plate to form a graphene oxide coating to obtain graphene oxide-modified positive plate, assembling the graphene oxide-modified positive plate with circular positive plate, a diaphragm, an electrolyte, a lithium sheet and a nickel net into a button cell in a glove box, and carrying out electrochemical reduction of the button cell to obtain the lithium ion battery. An INDEPENDENT CLAIM is included for lithium ion battery prepared by the above method.