▎ 摘　　要

NOVELTY - Cathode active material, comprises graphite and graphene in a mass ratio of (2-20):1. USE - The cathode active material is useful in cathode sheet of a battery (claimed). ADVANTAGE - The materials ensures that the achieves high-efficiency, has uniform lithium replenishment process and has high thermal conductivity, improves local overheating effect caused by uneven lithium supplementation, and the battery has better cycle performance and rate performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) cathode sheet, comprising cathode active material; and (2) preparation method of the cathode sheet.