Method for preparation of composite material containing silicon

A technology of silicon composite materials and composite particles, which is applied in electrode manufacturing, structural parts, electrical components, etc., can solve the problems of low specific capacity and poor cycle performance of batteries, and achieve the effect of high specific capacity and excellent cycle stability

Active Publication Date: 2008-06-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages of low specific capacity and poor battery cycle performance of existing silicon-containing composite materials, and provide a silicon-containing composite material with high specific capacity and good battery cycle performance and its preparation method

Method used

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  • Method for preparation of composite material containing silicon

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preparation example Construction

[0017] According to the preparation method of the silicon-containing composite material provided by the present invention, the composite material particles containing elemental silicon, graphite and surfactant can be obtained by uniformly dispersing elemental silicon particles, graphite particles and carbon nanotubes in a solution containing surfactant Remove the solvent to get. Described tensio-active agent can be conventional various macromolecule surfactants, for example can be polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, polyacrylic acid, polytetrafluoroethylene, polyvinylidene fluoride, carboxymethyl fiber One or more of cellulose, carboxyethyl cellulose, carboxymethyl methyl cellulose, polyacrylamide. After removing the solvent, the above-mentioned polymeric surfactant can coat elemental silicon, graphite and carbon nanotube particles to obtain composite material particles containing elemental silicon, graphite and carbon nanotubes. Because polyvinyl al...

Embodiment 1

[0028] This example is used to illustrate the silicon-containing composite material provided by the present invention and its preparation method.

[0029] Add 60 milliliters of deionized water, 15 milliliters of ethanol and 2 grams of polyvinyl alcohol into a 100 milliliter beaker, after stirring for 30 minutes, slowly add 10 grams of natural graphite (average particle diameter D 50 = 18 microns, crystallite layer spacing d 002 0.335 nanometers), after continuing to stir for 30 minutes, add 1 gram of nano silicon (particle diameter is 20-50 nanometers) and 0.06 gram carbon nanotubes (particle diameter is 20-50 nanometers, length 1- 2 microns), continue to stir and filter after 40 minutes, join the solution that contains 1.5 grams of epoxy resin E-44 and 40 milliliters of ethanol after the solid vacuum drying that obtains, stir in advance, continue to stir and filter after 40 minutes, The resulting solid was dried. Dry the solid in N 2 Under protection, the temperature was r...

Embodiment 2

[0037] This example is used to illustrate the silicon-containing composite material provided by the present invention and its preparation method.

[0038] Add 60 milliliters of deionized water, 15 milliliters of ethanol and 2 grams of polyvinylpyrrolidone into a 100 milliliter beaker, after stirring for 25 minutes, slowly add 10 grams of natural graphite (average particle diameter D 50 = 20 microns, crystallite layer spacing d 002 0.335 nanometers), after continuing to stir for 30 minutes, add 1 gram of nano silicon (particle diameter is 20-50 nanometers) and 0.17 grams of carbon nanotubes (particle diameter is 20-50 nanometers, length 0.5- 1 micron), continue to stir for 40 minutes and then filter, then add the solid obtained after vacuum drying to a solution that has been stirred uniformly beforehand containing 1.5 grams of epoxy resin E-50 and 40 milliliters of ethanol, continue to stir for 40 minutes and then filter, The resulting solid was dried. Dry the solid in N 2 U...

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Abstract

The invention relates to siliceous composite material, which comprises silicon, graphite and formless carbon; wherein, the material also comprises carbon nanotube, the silicon is nanometer silicon, and at least part of the formless carbon is coated on the surfaces of the silicon, the graphite and the carbon nanotube. The siliceous composite material provided by the invention has higher specific capacity even in the condition of lower silicon content, and in addition, the siliceous composite material can ensure the battery which adopts the siliceous composite material as negative pole active substance to have good circulation stability.

Description

technical field [0001] The invention relates to a silicon-containing composite material and a preparation method thereof. Background technique [0002] At present, commercialized lithium-ion batteries mostly use lithium transition metal oxide / graphite system as the negative electrode active material. The capacity is only 372 mAh / g. Such a low capacity is currently difficult to meet the miniaturization development of various portable electronic devices and the demand for large-capacity and high-power chemical power sources for electric vehicles. Therefore, a new negative electrode active material with higher specific capacity is currently being studied to improve the performance of lithium-ion batteries and meet market demand. [0003] Studies on non-carbon negative electrode active materials have shown that there are many metals or alloys with high lithium storage performance that may be used as negative electrode active materials. Among them, silicon has a large specific c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/04B22F1/02B22F9/00
CPCY02E60/10
Inventor 陈争光沈菊林肖峰
Owner BYD CO LTD
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