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A kind of preparation method of graphite intercalation compound negative electrode material suitable for fast charging lithium ion battery, its product and application

A lithium-ion battery, interlayer compound technology, applied in battery electrodes, graphite, negative electrodes, etc., can solve the problems of shortening the lithium ion conduction path, low energy density of the negative electrode, and poor high-rate performance, and achieve a smooth ion transmission channel. , the effect of few preparation steps and low cost of raw materials

Active Publication Date: 2022-07-12
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the many deficiencies of graphite negative electrodes, the first object of the present invention is to provide a method for preparing graphite interlayer compound negative electrode materials suitable for fast-charging lithium-ion batteries. The preparation method uses an intercalant with lithium storage activity to Carbon materials are modified, and unmodified carbon materials are mixed with graphite interlayer compounds to further shorten the lithium ion conduction path and improve the reversible capacity and rate performance of graphite; the second purpose of the present invention is to provide a method using The graphite interlayer compound negative electrode material suitable for fast charging lithium-ion batteries made by the above preparation method is used to improve the defects of low energy density and poor high rate performance of traditional graphite negative electrodes; the third purpose of the present invention is to provide a Application of graphite interlayer compound negative electrode material suitable for fast charging lithium ion battery and its preparation method in lithium ion battery

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  • A kind of preparation method of graphite intercalation compound negative electrode material suitable for fast charging lithium ion battery, its product and application
  • A kind of preparation method of graphite intercalation compound negative electrode material suitable for fast charging lithium ion battery, its product and application
  • A kind of preparation method of graphite intercalation compound negative electrode material suitable for fast charging lithium ion battery, its product and application

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Embodiment 1

[0035] A method for preparing a graphite interlayer compound negative electrode material suitable for fast-charging lithium-ion batteries, specifically comprising the following steps:

[0036] (1) Evenly mix 300 mesh flake graphite and anhydrous ferric chloride in a mass ratio of 1:5, seal in a vacuum reactor, heat up to 307°C at a rate of 5°C / min, keep for 12 hours, and cool with the furnace , the intermediate product of the interlayer compound is obtained;

[0037] (2) Take out the intermediate product of the interlayer compound, add a sufficient amount) of 0.1M NaOH solution (the molar ratio of NaOH to the anhydrous ferric chloride for preparing the intermediate product of the interlayer compound is greater than 1), and ultrasonically sonicate the solution for 30min, A 300-mesh graphite intercalation compound (GIC) was obtained, the product was washed with deionized water for several times, separated after suction filtration, and dried in an oven at 80°C for 12 hours;

[0...

Embodiment 2

[0041] In the preparation method of the graphite intercalation compound negative electrode material suitable for fast-charging lithium-ion batteries provided in this embodiment, except that the mass ratio of the graphite intercalation compound to the graphite sheet in step (3) is 0.65:0.35, the remaining steps are the same as the implementation of Example 1 is the same.

Embodiment 3

[0043] In the preparation method of the graphite interlayer compound negative electrode material suitable for fast-charging lithium-ion batteries provided in this embodiment, except that the mass ratio of the graphite interlayer compound to the graphite sheet in step (3) is 0.75:0.25, the remaining steps are the same as the implementation of Example 1 is the same.

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Abstract

The invention discloses a preparation method of a graphite interlayer compound negative electrode material suitable for fast-charging lithium ion batteries: (1) mixing a first carbon material with an intercalation agent and heating to obtain an interlayer compound intermediate product; (2) After the intercalation compound intermediate product obtained in step (1) is treated with an oxidizing agent and an alkaline compound, washed and dried to obtain a graphite intercalation compound; (3) the graphite intercalation compound obtained in step (2) is mixed with the second carbon material, The graphite interlayer compound negative electrode material is obtained. The invention also discloses a graphite interlayer compound negative electrode material suitable for fast charging lithium ion battery obtained by the above preparation method and its application in lithium ion battery. The graphite interlayer compound anode material obtained by the preparation method further shortens the lithium ion conduction path and improves the reversible capacity and rate performance of graphite; it is used to improve the defects of low energy density and poor high rate performance of traditional graphite anode.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a preparation method of a graphite interlayer compound negative electrode material suitable for fast charging lithium ion batteries, products and applications thereof. Background technique [0002] With the continuous improvement of social productivity, environmental pollution, climate warming and other issues have attracted more and more attention of human society. In order to fundamentally solve these problems, clean energy is gradually replacing traditional fossil energy to supply energy for production and life of human society. Communication transportation is an important part of human civilization, and electric drive is transforming all aspects of rail and road transportation. The high energy storage density of lithium-ion batteries makes power batteries possible. [0003] The appearance of graphite anode is a major turning point in impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/20C01B32/22H01M4/587H01M10/0525
CPCC01B32/20C01B32/22H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 胡子怡吴勇军洪子健黄玉辉佘圣贤
Owner ZHEJIANG UNIV