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Preparation method of graphite intercalation compound negative electrode material suitable for fast-charging lithium ion battery and product and application thereof

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

Active Publication Date: 2021-08-27
ZHEJIANG UNIV
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  • Summary
  • 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

Method used

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  • Preparation method of graphite intercalation compound negative electrode material suitable for fast-charging lithium ion battery and product and application thereof
  • Preparation method of graphite intercalation compound negative electrode material suitable for fast-charging lithium ion battery and product and application thereof
  • Preparation method of graphite intercalation compound negative electrode material suitable for fast-charging lithium ion battery and product and application thereof

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Embodiment 1

[0035] A preparation method for a graphite intercalation 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 at a mass ratio of 1:5, seal it in a vacuum reactor, raise the temperature to 307°C at a rate of 5°C / min, keep it warm for 12 hours, and cool with the furnace , to obtain the intermediate product of the interlayer compound;

[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 anhydrous ferric chloride for preparing the intermediate product of the interlayer compound is greater than 1), ultrasonicate the solution for 30min, 300 meshes of graphite interlayer compound (GIC) were obtained, and the product was washed with deionized water several times, separated by suction filtration, and dried in an oven at 80° C. for 12 ho...

Embodiment 2

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

Embodiment 3

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

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Abstract

The invention discloses a preparation method of a graphite intercalation compound negative electrode material suitable for a fast-charging lithium ion battery. The preparation method comprises the following steps: (1) mixing a first carbon material and an intercalation agent, and heating to obtain an intercalation compound intermediate product; (2) treating the intercalation compound intermediate product obtained in the step (1) with an oxidizing agent and an alkaline compound, washing with water, and drying to obtain a graphite intercalation compound; and (3) mixing the graphite intercalation compound obtained in the step (2) with a second carbon material to obtain the graphite intercalation compound negative electrode material. The invention also discloses the graphite intercalation compound negative electrode material suitable for the fast-charging lithium ion battery and prepared by the preparation method, and application of the graphite intercalation compound negative electrode material in the lithium ion battery. According to the graphite intercalation compound negative electrode material obtained by the preparation method, the lithium ion conduction path is further shortened, and the reversible capacity and the rate capability of graphite are improved; and the method is used for overcoming the defects of low energy density and poor high-rate performance of a traditional graphite negative electrode.

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, as well as its products and applications. Background technique [0002] With the continuous improvement of social productivity, environmental pollution, climate warming and other issues have attracted more and more attention from human society. In order to fundamentally solve these problems, clean energy is gradually replacing traditional fossil energy to provide energy for the production and life of human society. AC transportation is an important part of human civilization, and electric drives are revolutionizing every aspect of rail and road transportation. The high energy storage density of lithium-ion batteries makes power batteries possible. [0003] The emergence of graphite anode is a major turning point...

Claims

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Application Information

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Patent Type & Authority Applications(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
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