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A kind of silicon carbon composite negative electrode material and preparation method thereof

A negative electrode material and silicon-carbon composite technology, which is applied in the preparation/purification of carbon, battery electrodes, electrical components, etc., can solve the problems of cycle performance degradation and function reduction, and achieve the effect of improving performance and reducing specific surface area

Active Publication Date: 2018-05-15
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Agglomeration and uneven dispersion in the matrix will inevitably lead to a reduction in the effect of the buffer layer in the material design on the volume expansion effect of silicon particles during charge and discharge, so it cannot solve the problem of cycle performance degradation caused by it.

Method used

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  • A kind of silicon carbon composite negative electrode material and preparation method thereof
  • A kind of silicon carbon composite negative electrode material and preparation method thereof
  • A kind of silicon carbon composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve 95.232g of naphthalene in 500ml of ethylene glycol dimethyl ether, add 20.5356g of sodium block, and dissolve into a green-black solution. Stirring overnight, then 30.35g SiCl 4 It was added to the above green-black solution and stirred vigorously for 4 hours. Subsequently, the ethylene glycol dimethyl ether solution in which 25.29 g of polyvinyl butyral was dissolved was added to the suspension, and stirred for 2 h. Distill under reduced pressure to remove ethylene glycol dimethyl ether, then add cyclohexane to remove naphthalene. A tan solid was obtained. The above solid was raised to 800°C at a heating rate of 5 minutes and kept at 5 hours, then cooled naturally. Take out and wash away the sodium chloride in the product with distilled water, and dry to obtain the final product.

Embodiment 2

[0039] Dissolve 95.232g of naphthalene in 500ml of ethylene glycol dimethyl ether, add 20.5356g of sodium block, and dissolve into a green-black solution. After stirring overnight, 30.35 g of SiCl4 was added to the above green-black solution and stirred vigorously for 4 hours. Subsequently, the ethylene glycol dimethyl ether solution in which 8.56 g of phenolic resin was dissolved was added to the suspension, and stirred for 2 h. Distill under reduced pressure to remove ethylene glycol dimethyl ether, then add cyclohexane to remove naphthalene. A tan solid was obtained. The above-mentioned solid was raised to 450°C at a heating rate of 2°C / min and kept at 5 hours, then cooled naturally. Take out and wash away the sodium chloride in the product with distilled water, and dry it. Take 4.0 g of the above-mentioned product, add it into deionized water together with 0.4 g of polyethyleneimine, grind it with a planetary ball for 1.5 hours, and spray dry it. The obtained material ...

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Abstract

The invention provides a silicon-carbon composite negative electrode material for lithium ion batteries and a preparation method thereof. The method utilizes sodium naphthalene solution to reduce silicon compounds at room temperature to obtain well-dispersed silicon particles, and then adds a polymer organic material containing active hydrogen atoms into the reaction system, so that the organic material and the silicon particles are closely combined. After that, heat treatment is performed on the material to carbonize the organic material at high temperature to obtain a nano-silicon negative electrode material tightly covered by carbon.

Description

technical field [0001] The invention relates to a silicon-carbon composite negative electrode material for lithium ion batteries and a preparation method thereof, belonging to the field of lithium ion battery materials. Background technique [0002] With the continuous use of fossil fuels leading to gradual depletion and the global warming it brings, the new energy industry has gradually attracted the attention of many researchers. Among many new technologies, lithium-ion batteries have the advantages of high energy density, low self-discharge and environmental protection, so they are widely used in digital products and batteries for electric vehicles, and are a research hotspot in the field of new energy. [0003] At this stage, the anode materials of lithium-ion batteries are mainly graphite series materials, lithium titanate and other carbon materials. Graphite is the most widely used negative electrode material for lithium-ion batteries. It has the advantages of good cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395C01B32/05H01M4/38
CPCY02E60/10
Inventor 刘文娟罗建海
Owner 微宏先进材料公司
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