Method for preparing carbon coating graphite/silicon oxide composite material

A technology of composite materials and silicon oxides, which is applied to chemical instruments and methods, fibrous fillers, and inorganic pigment treatment, can solve the problems of poor cycle performance of negative electrode active materials and large particles of negative electrode materials, and achieve high specific capacity and reduce Effects of stress, excellent cycle stability

Inactive Publication Date: 2008-07-02
海宁市盐官工业投资有限公司
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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 shortcomings of the negative electrode material particles prepared by the existing preparation method that the negative electrode active material has poor cycle performance, and to provide a carbon package that can disperse silicon dioxide into graphite at the nanometer level The preparation method of the graphite / silicon oxide composite material makes the prepared carbon-wrapped graphite / silicon oxide composite material have the characteristics of excellent cycle stability and high specific capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This example is used to illustrate the preparation method of the carbon-wrapped graphite / silicon oxide composite material provided by the present invention.

[0024] 4.12 g containing Na 2 O, (8.2 wt%), SiO 2 (20% by weight) of water glass solution, prepare 400 milliliters of aqueous solution, add 4.5 grams of average particle diameter D in the solution 50 It is graphite powder of 18 microns, stir well, heat up to 70°C, treat for 6 minutes, slowly add dilute hydrochloric acid with a concentration of 0.2 mol / liter to pH 3.0 during rapid stirring, stir well and heat to form a paste, Dry to black powder. Soak the powder with 500 milliliters of deionized water, heat it slightly, pour out the superficial clarification solution after the solution is clarified, and wash it repeatedly like this for 6 times, then add 1 gram of glucose (the carbon content is 40% by weight) to it, add 200 milliliters of water Stir well, heat and evaporate to dryness until paste, and dry. The o...

Embodiment 2

[0028] This example is used to illustrate the preparation method of the carbon-wrapped graphite / silicon oxide composite material provided by the present invention.

[0029] 2.06 g containing Na 2 O, (8.2 wt%), SiO 2 (20% by weight) of water glass solution, prepare 400 milliliters of aqueous solution, add 4.75 grams of average particle diameter D in the solution 50 It is 22 micron graphite powder, stir well, heat up to 70°C, treat for 6 minutes, slowly add ammonium chloride solution with a concentration of 0.5 mol / liter to pH 4.0 during rapid stirring, stir well and heat to form a paste shape, and dried to a black powder. Soak the powder with 500 milliliters of deionized water, heat it slightly, pour out the clarified solution on the surface after the solution is clarified, and wash it repeatedly 3 times like this, then add 1 gram of polyethylene glycol (with a carbon content of 54.5% by weight) (Shanghai Runpeng Chemical Industry Co., Ltd.), add 200 milliliters of water, st...

Embodiment 3

[0031] This example is used to illustrate the preparation method of the carbon-wrapped graphite / silicon oxide composite material provided by the present invention.

[0032] Dissolve 3 grams of ethyl orthosilicate in 100 ml of alcohol, add 4.5 grams of stone with an average particle size D 50 Graphite powder of 20 microns and 0.5 gram of phenolic resin (carbon content is 70.5% by weight), fully stirred, heated up to 60 ° C, treated for 7 minutes, slowly dripping concentration of 0.5 mol / liter of ammonium chloride during rapid stirring The solution was adjusted to a pH value of 3.5, fully stirred evenly, heated and stirred to form a paste, and dried to obtain a black powder. The obtained material was heated up to 1250° C. at 5° C. / min under the protection of argon, kept for 4 hours, and quenched at 500 K / s to obtain carbon-coated graphite / silicon composite material A3.

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Abstract

A preparation method for a carbon encapsulated graphite/silicon oxide composite material comprises the following steps that: a uniform mixture of the graphite and silicate and/or silicon ester solution is contacted with acidoid so as to ensure that the uniform mixture forms sizing agent which is dried, products obtained by the sizing agent being dried are mixed with carbon matrix precursor solution, the mixture of products and carbon matrix precursor is dried and the dried solid is baked under the protect of inert gases. The carbon enclosed graphite/silicon oxide composite material made by the preparation method provided by the invention has excellent synthetical electrochemical properties. Compared with the composite material prepared by the prior art, the carbon enclosed graphite/silicon oxide composite material made by the preparation method obviously improves the specific capacity, the first efficiency for charge-discharge and the capacity conservation rate after the 20 times of circulation.

Description

technical field [0001] The invention relates to a preparation method of carbon-wrapped graphite / silicon oxide composite material. Background technique [0002] Most of the current commercialized lithium-ion batteries 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/06C09C1/44
Inventor 戴权沈菊林肖峰
Owner 海宁市盐官工业投资有限公司
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