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Preparation method of lithium ion battery electrode containing graphene-coated single crystal positive electrode material

A graphene-coated, lithium-ion battery technology, applied in the field of preparation of lithium-ion battery electrodes, can solve the problems of battery volume energy density reduction, low stacking density, easy mutual agglomeration, etc., and achieve high-rate charge and discharge capacity retention High, high cycle capacity retention rate, excellent overall performance

Active Publication Date: 2020-11-27
宁夏汉尧富锂科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Preparation method of lithium ion battery electrode containing graphene-coated single crystal positive electrode material
  • Preparation method of lithium ion battery electrode containing graphene-coated single crystal positive electrode material
  • Preparation method of lithium ion battery electrode containing graphene-coated single crystal positive electrode material

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Embodiment 1

[0088] Embodiment 1 provides a preparation method of a lithium 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-formazol It is prepared by adjusting the solid content of base pyrrolidone to 50% and then coating it on the current collector; the graphene-coated single crystal positive electrode material, conductive agent and binder are in a mass ratio of 94:3:3; wherein, the The conductive agent is carbon black (litx200 of Cabot Company); the binding agent is polyvinylidene fluoride (HSV900 of Arkema Company); the current collector is aluminum foil (1N00-H18 of Five Star Company);

[0089] The preparation steps of the graphene-coated single crystal cathode material include: at room temperature, the binder and the solvent B are mixed according to a mass ratio of 1:9 to form an organic solvent A; the...

Embodiment 2

[0098] Embodiment 2 provides a preparation method of a lithium 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-formazol It is prepared by adjusting the solid content of base pyrrolidone to 50% and then coating it on the current collector; the graphene-coated single crystal positive electrode material, conductive agent and binder are in a mass ratio of 94:3:3; wherein, the The conductive agent is carbon black (litx200 of Cabot Company); the binding agent is polyvinylidene fluoride (HSV900 of Arkema Company); the current collector is aluminum foil (1N00-H18 of Five Star Company);

[0099] The preparation steps of the graphene-coated single crystal cathode material include: at room temperature, the binder and the solvent B are mixed according to a mass ratio of 1:9 to form an organic solvent A; the...

Embodiment 3

[0108] Embodiment 3 provides a preparation method of a lithium 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-formazol It is prepared by adjusting the solid content of base pyrrolidone to 50% and then coating it on the current collector; the graphene-coated single crystal positive electrode material, conductive agent and binder are in a mass ratio of 94:3:3; wherein, the The conductive agent is carbon black (litx200 of Cabot Company); the binding agent is polyvinylidene fluoride (HSV900 of Arkema Company); the current collector is aluminum foil (1N00-H18 of Five Star Company);

[0109]The preparation steps of the graphene-coated single crystal cathode material include: at room temperature, the binder and the solvent B are mixed according to a mass ratio of 1:9 to form an organic solvent A; the ...

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Abstract

The invention relates to the field of lithium ion battery electrodes, and concretely relates to a preparation method of a lithium ion battery electrode containing a graphene-coated single crystal positive electrode material. The preparation method of the lithium ion battery electrode containing the graphene-coated single crystal positive electrode material comprises the following steps: mixing thegraphene-coated single crystal positive electrode material with a conductive agent and a binder, adding N-methylpyrrolidone to adjust the solid content, and coating a current collector with the obtained mixture to prepare the lithium ion battery electrode. The lithium ion battery electrode is obtained by the preparation method, and contains the special positive electrode material, the surface ofthe electrode is covered with graphene with a specific morphology, and the morphology-covered graphene does not change the original crystalline phase structure or size of the single crystal positive electrode material, so that the prepared lithium ion battery has lower impedance, higher 45-DEG C cycle capacity retention ratio and higher high-rate discharge and charge capacity retention ratio, andthe comprehensive performance of the lithium ion battery 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1391H01M10/0525H01M10/058B82Y30/00B82Y40/00
CPCH01M4/625H01M4/1391H01M10/0525H01M10/058B82Y30/00B82Y40/00Y02E60/10Y02P70/50
Inventor 王哲步绍宁王欣全王浩于春奇杜萍刘晓雨温宇徐昊邬素月张永龙刘嫄嫄李来强
Owner 宁夏汉尧富锂科技有限责任公司
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