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Modified natural graphite and preparation method thereof

A natural graphite, modified technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of unstable structure, uneven coating, poor cycle performance, etc., to achieve high retention rate and good adaptability , the effect of large discharge capacity

Active Publication Date: 2014-09-10
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a new modified natural graphite and its preparation method in order to overcome defects such as uneven coating, unstable structure and poor cycle performance of existing natural graphite in the modification process

Method used

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  • Modified natural graphite and preparation method thereof
  • Modified natural graphite and preparation method thereof
  • Modified natural graphite and preparation method thereof

Examples

Experimental program
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Embodiment 1～8

[0043] Examples 1 to 8, Comparative Examples 1 to 2

[0044] As shown in Table 1, CMC is sodium carboxymethyl cellulose, coal pitch is XH, petroleum pitch is XL, GMS is stearic acid monoglyceride, SMS is silane coupling agent, phenolic resin is XGH, and silicon carbide is SiC, carbonized boron is GS.

[0045] Table 1

[0046]

[0047]

[0048] In Table 1, the ratio refers to the weight ratio of the binder, wetting and dispersing agent, natural graphite, coating material and graphitization catalyst.

[0049] The preparation method is as follows:

[0050] Wherein, the preparation steps of Example 1 include:

[0051] (1) Add the adhesive and the wetting and dispersing agent to deionized water, mix them thoroughly, and make a mixed solution with a mass concentration of 30%;

[0052] (2) Add natural graphite to the mixed solution prepared in step (1), mix thoroughly and dry until the water content of natural graphite is less than 200 ppm; the D50 value of the natural graphite is measured to b...

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Abstract

The invention discloses modified natural graphite and a preparation method thereof. The preparation method comprises the following steps: (1) adding a wetting dispersant and a bonding agent in a weight ratio of 1: 10 to 3: 10 into water and carrying out full mixing so as to prepare a mixed solution with a mass concentration of 30 to 60%; (2) adding natural graphite into the mixed solution prepared in the step (1) and successively carrying out mixing and drying; (3) fully mixing a substance obtained in the step (2) with an amorphous carbon precursor and a graphitization catalyst in a cladding kettle, carrying out heating to 300 to 400 DEG C and then carrying out thermal condensation polymerization at a constant temperature; (4) subjecting a substance obtained in the step (3) to compression molding and then carrying out hot isostatic pressing; and (5) subjecting a substance obtained in the step (4) to carbonizing treatment at first and graphitization treatment next under the protection of inert gas. A lithium ion battery negative electrode material prepared from the modified natural graphite has high initial charge and discharge efficiency, long cycle performance and good application prospects.

Description

Technical field [0001] The invention belongs to the field of material modification, and particularly relates to a modified natural graphite and a preparation method thereof. Background technique [0002] In recent years, consumer electronic products have become more and more personalized and multifunctional. Consumers are paying more attention to battery life, energy density, and safety. Therefore, some anode materials with long cycle life and high energy density have been extensively studied. At present, the negative electrode of lithium-ion batteries is mainly graphite material, mainly because graphite material has the advantages of high conductivity and better charging and discharging platform. However, graphite materials also have certain shortcomings. For example, natural graphite is composed of a scale layer structure, and van der Waals forces are the main layer between the layers. The unstable structure can easily cause the co-embedding of the solvent, which leads to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62
CPCH01M4/583H01M4/622H01M10/0525Y02E60/10
Inventor 刘金峰丁晓阳苗荣荣杜辉玉吴志红李杰胡东山
Owner SHANGHAI SHANSHAN TECH CO LTD
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