▎ 摘　　要

NOVELTY - Composite lithium manganate positive electrode sheet has a current collector, a lithium-manganate coating positive electrode on the current collector and a lithium iron phosphate coating layer surface on the surface of the lithium-manganate coating electrode. The thickness of the lithium manganate positive electrode coating is 10-500 microm, and the thickness of the lithium iron phosphate coating is 2-200 microm. USE - Composite lithium manganate positive electrode sheet for use in lithium-ion battery (claimed). ADVANTAGE - The composite lithium manganate positive electrode sheet has high temperature cycle performance and high temperature storage performance, and reduces the secondary reaction at high temperature and electrolyte solution. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a preparation method of composite lithium manganate cathode sheet, which involves: (a) uniformly dispersing the lithium manganate positive electrode material, conductive agent and binder in a solvent to obtain a lithium manganate positive electrode slurry; (b) coating the lithium manganate positive electrode slurry on the aluminum foil and drying to obtain the lithium manganate positive electrode coating pole piece; (c) dispersing the lithium iron phosphate positive electrode material, the conductive agent and the binder in the solution to obtain the lithium iron phosphate positive electrode slurry; (d) coating the lithium iron phosphate positive electrode slurry on the lithium manganate positive electrode coating electrode sheet and drying to obtain a composite lithium manganate positive electrode sheet; (2) a lithium-ion battery, which has a lithium manganate positive electrode sheet, negative electrode sheet, electrolyte and polyolefin separator.