▎ 摘　　要

NOVELTY - A composite positive electrode sheet comprises a positive electrode current collector provided with an undercoat layer in a direction away from the positive electrode current collector, an active material layer and a solid electrolyte layer. The undercoat layer contains an electroconductive agent. The electroconductive agent is chosen from carbon black, carbon nanotubes, carbon fibers, hollow carbon spheres and graphene. USE - Composite positive electrode sheet is used in lithium-ion battery (claimed). ADVANTAGE - The undercoat layer can improve contact resistance between active material layer and current collector, improve conductivity, rate performance and thermal performance of the composite positive electrode sheet, and reduces the corrosive effect of the electrolyte on the current collector, and avoids problem caused by the increase of the resistance after the long-term circulation of collector. The solid electrolyte layer can effectively prevent the electrolyte in the lithium-ion battery from direct contacting with the active material layer, reduce the occurrence of side reactions and improve the rate of performance of the battery. The lithium-ion battery provided with the composite positive electrode sheet has excellent circulation performance, and is safe. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite positive electrode sheet.