A lithium-ion battery positive electrode material, electrode and preparation method coated with layered nano-lithium manganate inlaid with graphene

Abstract

The invention provides a layered structure nanometer lithium manganate-inlaid graphene-coated positive electrode material for a lithium-ion battery, an electrode and a preparation method, relates to the field of secondary batteries, in particular to a surface-coated modified positive electrode material for the lithium-ion battery, the electrode and the preparation method of the positive electrode material, and aims at solving the problems that the positive electrode material for the lithium-ion battery is low in capacity and poor in rate capability since an existing coating material is relatively poor in electron conductivity and ion conductivity. According to the positive electrode material provided by the invention, the layered structure nanometer lithium manganate-inlaid graphene-coated positive electrode material with a lithium ion diffusion channel and a nanometer size for the lithium-ion battery and the electrode of the battery are prepared by an electrochemical reduction method. Graphene of a coating layer has high electron conductivity; the layered structure lithium manganate with the nanometer size inlaid on a graphene sheet layer has the lithium-ion conductivity; and the positive electrode material, a conductive agent and a binder are mixed and coat a current collector to form the electrode. The positive electrode material and the electrode provided by the invention are applied to the lithium-ion battery.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a surface-coated and modified lithium-ion battery cathode material, an electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, high power density, high energy density, and high voltage platform. At present, they have been widely used in mobile phones, laptop computers and other electronic products, and are also the main choice of power batteries for electric vehicles and electric tools. Cathode material is a key factor affecting the energy density, cycle life and safety of lithium-ion batteries. Currently widely researched and applied lithium-ion battery cathode materials include lithium iron phosphate, lithium cobalt phosphate, and lithium manganese phosphate with olivine structure, lithium cobalt oxide, nickel-cobalt-manganese, and nickel-cobalt-aluminum ternary materials with layered structure, r...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor electronic conductivity and ionic conductivity of the existing coating materials, which lead to low capacity and poor rate performance of lithium-ion battery cathode materials, and provide a lithium manganate mosaic nano-layered structure Graphene material-coated lithium-ion battery positive electrode material, electrode, preparation method and application, a coating layer material with both electronic conductivity and ion conductivity is prepared by embedding lithium ion conductors on graphene sheets, so that The capacity, rate performance and cycle performance of cathode materials are greatly improved

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