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Preparation process of high-rate graphene composite material, negative electrode material and lithium battery

A preparation process and composite material technology, applied in the field of negative electrode materials of lithium ion batteries, can solve the problems of potential safety hazards, complex preparation process and high production cost, and achieve the effects of stable product quality, simple preparation process and low production cost

Active Publication Date: 2019-12-20
湖南海容新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, under high magnification, lithium ions will precipitate from the graphite surface to form lithium dendrites, which poses a safety hazard. However, the existing graphite modification methods all have the problems of complicated preparation process and high production cost.

Method used

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  • Preparation process of high-rate graphene composite material, negative electrode material and lithium battery
  • Preparation process of high-rate graphene composite material, negative electrode material and lithium battery
  • Preparation process of high-rate graphene composite material, negative electrode material and lithium battery

Examples

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Effect test

Embodiment 1

[0046] A preparation process for a high-magnification graphene composite material, the steps comprising:

[0047] Crushing the raw materials to obtain pulverized raw materials;

[0048] Add coating agent and binder to the pulverized raw material, and then carry out stepwise constant temperature heat treatment after mixing to obtain coarse material;

[0049] Shaping and sieving the coarse material to obtain the high-magnification graphene composite material;

[0050] The raw material includes at least one of natural graphite microspheres and artificial graphite microspheres, and the graphitization degree of the raw material is higher than 90%.

[0051]Among them, the particle size D50 of the high-magnification graphene composite material is 7 μm. The pulverization of raw materials is carried out by mechanical grinding. Use a planetary mixer to mix the pulverized raw materials, coating agent and binder. Add the mixed material in 2 to 3 batches. When mixing the pulverized ra...

Embodiment 2

[0059] A preparation process for a high-magnification graphene composite material, the steps comprising:

[0060] Crushing the raw materials to obtain pulverized raw materials;

[0061] Add coating agent and binder to the pulverized raw material, and then carry out stepwise constant temperature heat treatment after mixing to obtain coarse material;

[0062] Shaping and sieving the coarse material to obtain the high-magnification graphene composite material;

[0063] The raw material includes at least one of natural graphite microspheres and artificial graphite microspheres, and the graphitization degree of the raw material is higher than 90%.

[0064] Among them, the particle size D50 of the high-magnification graphene composite material is 7 μm. The pulverization of raw materials is carried out by mechanical grinding. Use a planetary mixer to mix the pulverized raw materials, coating agent and binder. Add the mixed material in 2 to 3 batches. When mixing the pulverized r...

Embodiment 3

[0072] A preparation process for a high-magnification graphene composite material, the steps comprising:

[0073] Crushing the raw materials to obtain pulverized raw materials;

[0074] Add coating agent and binder to the pulverized raw material, and then carry out stepwise constant temperature heat treatment after mixing to obtain coarse material;

[0075] Shaping and sieving the coarse material to obtain the high-magnification graphene composite material;

[0076] The raw material includes at least one of natural graphite microspheres and artificial graphite microspheres, and the graphitization degree of the raw material is higher than 90%.

[0077] Among them, the particle size D50 of the high-magnification graphene composite material is 12 μm. The pulverization of raw materials is carried out by mechanical grinding. Use a planetary mixer to mix the pulverized raw materials, coating agent and binder. Add the mixed material in 2 to 3 batches. When mixing the pulverized ...

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Abstract

The embodiment of the invention provides a preparation process of a high-rate graphene composite material, a negative electrode material and a lithium battery. The process comprises the steps of firstly crushing raw materials, then adding a coating agent and a binder for uniform mixing, carrying out stepped constant-temperature heat treatment to obtain a coarse material, and then after reshaping the coarse material, screening to obtain the high-rate graphene composite material. The material has the characteristics of high capacity and high compaction density, the preparation process is simple,the production cost is low, and the prepared product is stable in quality and is suitable for large-scale batch production. The embodiment of the invention also provides a negative electrode materialof the lithium ion battery and the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a preparation process of a high-magnification graphene composite material, negative electrode materials and lithium batteries. Background technique [0002] The performance of lithium-ion battery anode materials seriously affects the performance of lithium-ion batteries. Lithium-ion battery anode materials can generally be divided into two categories: carbon materials and non-carbon materials. Carbon materials include graphite, non-graphite and nanostructured carbon-based anode materials. Carbon materials have the characteristics of environmental friendliness, low cost, high specific capacity, good cycle performance, long life and low chemical potential, among which graphite is currently the most commercialized anode material. [0003] Existing natural graphite products, in the process of lithium ion intercalation and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 黄益李欢朱磊林禹玲
Owner 湖南海容新材料有限责任公司
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