A kind of preparation method of lithium ion battery electrode containing graphene-coated single crystal positive electrode material

Abstract

The invention relates to the field of lithium-ion battery electrodes, in particular to a preparation method of a lithium-ion battery electrode containing a graphene-coated single-crystal positive electrode material. A preparation method of a lithium ion battery electrode containing a graphene-coated single crystal positive electrode material, the steps include mixing the graphene-coated single crystal positive electrode material with a conductive agent and a binder, and then adding N-methylpyrrolidone to adjust the solid It is prepared after coating on the current collector. The invention provides a preparation method of a lithium-ion battery electrode containing a graphene-coated single-crystal positive electrode material. The lithium-ion battery electrode is obtained through the preparation method. Because it contains a special positive electrode material, its surface is covered with graphene of a specific shape. The graphene covered by this morphology will not change the original crystal phase structure and size of the single crystal positive electrode material, which is beneficial to the prepared lithium-ion battery with lower impedance, higher 45°C cycle capacity retention rate, and high rate discharge. And the retention rate of charging capacity is higher, and the comprehensive performance of lithium-ion batteries is optimized.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrodes, and more specifically, the invention relates to a preparation method of a lithium-ion battery electrode containing a graphene-coated single-crystal positive electrode material. 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

However, when graphene is applied to the positive electrode material of lithium-ion batteries, it is easy to agglomerate with each other, the packing density is low and it is difficult to disperse, which will reduce the volumetric energy density of the battery and increase the difficulty of the electrode sheet coating process.

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