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A kind of 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 poor cycle performance, uneven coating, unstable structure, etc., to achieve high retention rate and good adaptability , the effect of large discharge capacity

Active Publication Date: 2017-12-01
SHANGHAI SHANSHAN TECH CO LTD
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  • 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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  • A kind of modified natural graphite and preparation method thereof
  • A kind of modified natural graphite and preparation method thereof
  • A kind of modified natural graphite and preparation method thereof

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Embodiment 1～8

[0043] Embodiment 1~8, comparative example 1~2

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

[0045] Table 1

[0046]

[0047]

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

[0049] The preparation method is as follows:

[0050] Wherein, the preparation step of embodiment 1 comprises:

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

[0052] (2) natural graphite is added in the mixed solution that step (1) makes, after fully mixing, be dried to the water content of natural graphite less than 200ppm; The D50 value of described natural graphite r...

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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, in particular to a modified natural graphite and a preparation method thereof. Background technique [0002] In recent years, consumer electronics products are becoming more and more personalized and multi-functional, and consumers pay 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 electrodes of lithium-ion batteries are mainly graphite materials, mainly because graphite materials have the advantages of high conductivity and good charge and discharge platform. However, graphite materials also have certain disadvantages. For example, natural graphite is composed of scale layers, and the van der Waals force is the main force between layers. The unstable structure is likely to cause co-embedding of solvents, resulting in a decrease in the charge and di...

Claims

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Application Information

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Patent Type & Authority Patents(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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