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A kind of preparation method of graphene-coated lithium-ion battery cathode material

A lithium-ion battery, graphene coating technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as weakening battery machinability and safety performance, reducing difficulty, reducing voltage decay, and increasing capacity. Effect

Active Publication Date: 2020-09-25
宁夏汉尧富锂科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Uneven dispersion of graphene on the surface of the positive electrode material will cause agglomeration, which makes the material highly oxidizable at the end of charging, resulting in the release of a large amount of oxygen, which weakens the processability and safety performance of the battery

Method used

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  • A kind of preparation method of graphene-coated lithium-ion battery cathode material

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1 of the present invention provides a graphene-coated lithium-ion battery positive electrode material, the preparation method of which is: material A containing graphene, organic solvent-1 and positive electrode active material are mixed to form material B, and then material B is subjected to magnetic induction Spray drying is carried out after the action of an electromagnetic field with a strength of 0.5T, the drying temperature is 170°C, and the composite is carried out for 30 minutes after spray drying, and the rotation speed during the composite process is 4000rpm;

[0039] Graphene-containing material A, organic solvent-1 and positive electrode active material are mixed to form material B at a rotation speed of 600 rpm and a mixing temperature of 60°C;

[0040] The weight ratio of substance A to positive electrode activity is 0.6:99.4;

[0041] The solid-to-liquid ratio of substance B is 0.7;

[0042] The positive active material is LiCoO 2 ;

[0043]...

Embodiment 2

[0047] Embodiment 2 of the present invention provides a graphene-coated lithium-ion battery positive electrode material, the preparation method of which is: material A containing graphene, organic solvent-1 and positive electrode active material are mixed to form material B, and then material B is subjected to magnetic induction Spray drying is carried out after the action of an electromagnetic field with a strength of 0.8T, the drying temperature is 300°C, and the composite is carried out for 60 minutes after spray drying, and the rotation speed during the composite process is 6000rpm;

[0048] Graphene-containing material A, organic solvent-1, and positive electrode active material are mixed to form material B at a rotational speed of 800 rpm and a mixing temperature of 70°C;

[0049] The weight ratio of substance A to positive electrode activity is 0.2:99.8;

[0050] The solid-to-liquid ratio of substance B is 0.9;

[0051] The positive active material is LiCoO 2 ;

[00...

Embodiment 3

[0056] Embodiment 3 of the present invention provides a graphene-coated lithium-ion battery positive electrode material, the preparation method of which is: material A containing graphene, organic solvent-1 and positive electrode active material are mixed to form material B, and then material B is subjected to magnetic induction Spray drying is carried out after the action of an electromagnetic field with a strength of 0.3T, the drying temperature is 120°C, and the composite is carried out for 1min after spray drying, and the rotation speed during the composite process is 2000rpm;

[0057] Graphene-containing substance A, organic solvent-1, and positive electrode active substance are mixed to form substance B at a rotation speed of 400 rpm and a mixing temperature of 50°C;

[0058] The weight ratio of substance A to positive electrode activity is 1:99;

[0059] The solid-to-liquid ratio of substance B is 0.5;

[0060] The positive active material is LiCoO 2 ;

[0061] Graph...

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Abstract

The invention belongs to the technical field of lithium-ion battery positive electrode materials, and specifically, provides a preparation method of a graphene coated lithium-ion battery positive electrode material. A first aspect of the invention provides a preparation method of a graphene coated lithium-ion battery positive electrode material, which includes the steps of mixing a graphene-containing substance A, an organic solvent -1 and a positive active substance into a substance B and spray-drying the substance B after electromagnetic field action, wherein the weight ratio of the substance A to the positive active substance is (0.2-1): (99.6-99).

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and specifically, the invention provides a preparation method of graphene-coated lithium-ion battery cathode materials. 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 batteries. New energy vehicles have become a new growth point and pillar for industrial technology upgrading and economic development in countries all over the world. However, there are still cert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M10/0525Y02E60/10
Inventor 温宇刘晓雨杜萍张永龙王浩步绍宁于春奇王欣全
Owner 宁夏汉尧富锂科技有限责任公司
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