Lithium-ion battery electrodes containing micron-scale graphene-coated single-crystal cathode materials

Abstract

The present invention relates to the technical field related to lithium-ion batteries. More specifically, the first aspect of the present invention provides a lithium-ion battery electrode containing a single crystal positive electrode material coated with micron-scale graphene. The preparation raw material includes micron-scale graphene-coated The single crystal positive electrode material, conductive agent, binder and current collector; wherein, the preparation raw materials of the single crystal positive electrode material coated with micron-scale graphene include positive electrode material and graphene, and the particle size of graphene is 1 μ m ~ 20 μ m; preferably 1 μm to 10 μm. The invention provides a lithium-ion battery electrode containing a single-crystal cathode material coated with micron-scale graphene. The original crystalline phase structure and size of the crystalline positive electrode material is beneficial to the prepared battery material with smaller impedance, higher 45°C cycle capacity retention rate, higher high-rate discharge and charge capacity retention rate, and optimizes the comprehensive performance of the battery .

Description

technical field [0001] The invention relates to the technical field related to lithium-ion batteries, and more specifically, the invention provides a lithium-ion battery electrode containing a single-crystal positive electrode material coated with micron-scale graphene. Background technique [0002] With the development of lithium-ion batteries and related material preparation technologies in recent years, lithium-ion batteries have undoubtedly replaced nickel-metal hydride, lead-acid and other batteries to become a new generation of power sources with high technological content and the most widely used. High, good cycle performance, good safety performance and other advantages, known as "the most promising chemical power source", China has become one of the fastest-growing and most active regions in the world for lithium-ion batteries. Lithium-ion battery cathode materials are one of the key factors determining battery performance. Therefore, under the current situation, it...

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Problems solved by technology

[0003] Graphene, as a material with good conductivity, is very suitable as a coating material for surface modification of lithium-ion cathode materials, but there is no specific structure of the coating material that can effectively improve the overall performance of the battery. Therefore, the present invention provides a lithium-ion battery electrode containing a single crystal positive electrode material coated with micron-scale graphene, and explores the microscopic performance of the positive electrode material coated with micron-scale graphene so that it can effectively Improve the overall performance of the battery

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