▎ 摘　　要

NOVELTY - The method involves using 1-20 mg/mL of graphene oxide solution (1). A mixed solution of nano-silicon and polymer is prepared (2). The mixed solution is dissolved in a water solution and alcohol, where concentration of the polymer in the mixed solution is 1-50 mg/mL and mass ratio of the nano-silicon and the polymer granule is 0.05-1. A static spray coating process is performed (3) by using a current collector. Graphene oxide solution and the mixed solution are sprayed (4) on the current collector. A carbonization treatment is performed (5) to obtain a cathode piece. USE - Lithium ion battery cathode piece preparation method. ADVANTAGE - The method ensures simple process and high capacity of the cathode piece and enables satisfying application requirements. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a lithium ion battery. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating a lithium ion battery cathode piece preparation method. '(Drawing includes non-English language text)' Step for using graphene oxide solution (S1) Step for preparing mixed solution of nano-silicon and polymer (S2) Step for performing static spray coating process by using a current collector (S3) Step for spraying graphene oxide solution and the mixed solution on the current collector (S4) Step for performing carbonization treatment to obtain cathode piece (S5)