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Fast-charging graphite negative electrode material based on amorphous carbon coating and preparation method of fast-charging graphite negative electrode material

A graphite anode, fast charging technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of not meeting market demand, low charging performance, etc., to achieve perfect coating effect, improve charging performance, and reduce polarization Effect

Pending Publication Date: 2022-02-08
大连宏光锂业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, due to the rapid development of new energy vehicles and portable digital electronic products, the market's demand for lithium-ion batteries with high energy density, high cycle life, and fast charging has become increasingly urgent, and the above-mentioned properties of lithium-ion batteries are mainly restricted by graphite negative electrode materials. , the conventional graphite anode material cannot meet the market demand due to its low charging performance

Method used

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  • Fast-charging graphite negative electrode material based on amorphous carbon coating and preparation method of fast-charging graphite negative electrode material

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Effect test

Embodiment 1

[0026] This embodiment provides a fast-charging graphite negative electrode material and a preparation method based on amorphous carbon coating, including the following steps:

[0027] 1) Firstly, the calcined petroleum coke is coarsely pulverized, finely pulverized, and then shaped and classified to obtain a fine powder with a D50 particle size of 8 μm;

[0028] 2) Put the fine powder obtained in step 1) into a graphitization furnace for graphitization, the graphitization temperature is 3000°C, and the graphitization time is 56h to obtain a graphitization precursor;

[0029] 3) Mix the graphitized precursor obtained in step 2) with the organic solvent of the phenolic resin according to the ratio of 1:20, wherein the ratio of the phenolic resin to the organic solvent is 1:10, and then spray dry to obtain the precursor, wherein the spray The drying temperature is 180°C;

[0030] 4) The spray-dried precursor obtained in step 3) was carbonized in a pusher kiln at 850° C. for 10 ...

Embodiment 2

[0035] This embodiment provides a fast-charging graphite negative electrode material and a preparation method based on amorphous carbon coating, including the following steps:

[0036] 1) Coarsely pulverizing and finely pulverizing the needle coke raw coke, and then performing shaping and grading to obtain a fine powder with a D50 particle size value of 6 μm;

[0037] 2) Put the fine powder obtained in step 1) into a graphitization furnace for graphitization, the graphitization temperature is 3100°C, and the graphitization time is 60h to obtain a graphitized precursor;

[0038] 3) Mix the graphitized precursor obtained in step 2) with the organic solvent of asphalt according to the ratio of 1:25, wherein the ratio of the phenolic resin to the organic solvent is 1:12, and then spray dry to obtain the precursor, wherein the spray-dried The temperature is 200°C;

[0039] 4) The spray-dried precursor obtained in step 3) was carbonized in a pusher kiln at 1050° C. for 12 hours und...

Embodiment 3

[0044] This embodiment provides a fast-charging graphite negative electrode material and a preparation method based on amorphous carbon coating, including the following steps:

[0045] 1) Firstly, the calcined needle coke is coarsely pulverized, finely pulverized, and then shaped and classified to obtain a fine powder with a D50 particle size of 7 μm;

[0046] 2) Put the fine powder obtained in step 1) in a graphitization furnace for graphitization, the graphitization temperature is 3200°C, and the graphitization time is 75h to obtain a graphitization precursor;

[0047] 3) Mix the graphitized precursor obtained in step 2) with the organic solvent of the phenolic resin according to the ratio of 1:30, wherein the ratio of the phenolic resin to the organic solvent is 1:10, and then spray dry to obtain the precursor, wherein the spray The drying temperature is 250°C;

[0048] 4) The spray-dried precursor obtained in step 3) was carbonized in a pusher kiln at 1200° C. for 8 hours...

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Abstract

The invention belongs to the field of lithium ion battery negative electrode materials, and relates to a fast-charging graphite negative electrode material based on amorphous carbon coating and a preparation method of the fast-charging graphite negative electrode material. The preparation method comprises the steps that a graphite raw material is prepared into powder, graphitization is performed to obtain a graphitized precursor, liquid coating is performed on the graphitized precursor to obtain a precursor, mixing and granulation are performed to obtain a granulation precursor, and carbonization is carried out to obtain the graphite negative electrode material. The process is simple, large-scale production is extremely easy, and the prepared lithium ion battery negative electrode material has the characteristics of uniform surface coating, high isotropy, good charging rate performance and the like.

Description

technical field [0001] The invention relates to a high compaction rate type lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of lithium ion battery negative electrode material preparation. Background technique [0002] In recent years, due to the rapid development of new energy vehicles and portable digital electronic products, the market's demand for lithium-ion batteries with high energy density, high cycle life, and fast charging has become increasingly urgent, and the above-mentioned properties of lithium-ion batteries are mainly restricted by graphite negative electrode materials. , the conventional graphite anode material can no longer meet the market demand due to its low charging performance. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a fast-charging graphite negative electrode material coated with amorphous carbon and its preparation method. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/36H01M4/133H01M4/1393
CPCH01M4/583H01M4/366H01M4/133H01M4/1393Y02E60/10
Inventor 王庆成宋爽韩团辉
Owner 大连宏光锂业有限责任公司
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