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Silicon carbon composite material and preparation method and application thereof

A silicon-carbon composite material, nano-silicon technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of complex preparation process, poor repeatability, high cost, reduce volume expansion effect, improve pulverization, battery High stability effect

Active Publication Date: 2018-06-08
CHINA PETROLEUM & CHEM CORP +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] However, these nano-silicon-carbon composites obtained from the technology have complicated preparation process, low yield, poor reproducibility, and high cost

Method used

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  • Silicon carbon composite material and preparation method and application thereof
  • Silicon carbon composite material and preparation method and application thereof
  • Silicon carbon composite material and preparation method and application thereof

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preparation example Construction

[0045] To sum up, the preparation method of the silicon-carbon composite material of the present invention includes: (1) adopting the chemical precipitation method to prepare a double-layer structure material of Bernalite ferric hydroxide-coated nano-silicon in a heterogeneous nucleation mode; (2) The double-layer structure material is mixed with the ethanol solution of phenolic resin, evaporated to dryness, and subjected to high-temperature sintering treatment to obtain three-layer coating structure particles of amorphous carbon-Bernalite iron hydroxide-nano-silicon in sequence from the outside to the inside; ( 3) Treat the three-layer coating structure particles of amorphous carbon-Bernalite iron hydroxide-nano-silicon in acid solution, remove the Bernalite iron hydroxide in the middle layer, and prepare a three-dimensional layered petal-shaped porous amorphous carbon coating Composite structural material coated with nano-silicon.

[0046] Its basic principle and operation p...

Embodiment 1

[0056] (1)Fe(OH) 3 - Preparation of nano-Si composite materials:

[0057] a. Mix 0.5g of nano-Si powder with FeCl 2 4H 2 O is dissolved in 200ml of water according to the mass ratio of 1:1; the particle size of the nano-Si powder is 80nm-300nm.

[0058] b. Add 1ml of concentrated ammonia water to 100ml of water, then slowly add the solution dropwise to the above solution with a peristaltic pump, so that the nucleation is heterogeneous, and the crystal nuclei grow up to form particle precipitation;

[0059] c. After stirring for 2 hours, a three-dimensional lamellar petal-like Fe(OH) was obtained 3 - The nano-Si precipitate was centrifuged at a speed of 4500 r / min to obtain a precipitate, which was dried at 40° C. for 5 hours.

[0060] figure 2 For the precipitate Fe(OH) 3 - XRD powder diffraction pattern of nano-Si. From figure 2 It can be seen from the figure that the diffraction peaks in the XRD powder diffraction patterns of the samples before and after coating co...

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Abstract

The invention relates to a silicon carbon composite material. The silicon carbon composite material comprises a nanometer silicon core and a porous carbon shell, wherein the porous carbon shell is coated outside the nanometer silicon core, the porous carbon shell wraps the nanometer silicon core in a form of three-dimensional layer sheet pedal-shaped amorphous carbon, and a gap is formed between the porous carbon shell and the nanometer silicon core. The silicon carbon composite material has excellent electrochemical performance when used as a battery negative electrode material; and comparedwith a silicon raw material negative electrode material, the specific capacity and the cycle property of the silicon carbon composite material are remarkably improved, the specific area and the conductivity of the material can be substantially improved by a three-dimensional layer sheet pedal-shaped porous structure of the material, the strength and the flexibility of the material are improved, and the expansion problem of the silicon negative electrode is effectively solved. The invention also comprises a preparation method of the silicon carbon composite material.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a silicon-carbon composite material and its preparation method and application. Background technique [0002] With the accelerated development of the automobile industry and the improvement of people's quality of life, large-capacity, high-rate batteries are becoming more and more important in daily life. pollution of the environment. Therefore, it is very urgent to study high energy density, green and pollution-free lithium-ion battery technology. Research on new energy can improve people's living standards, develop my country's comprehensive national strength, promote economic development, and enhance our country's international status. The research is significant. [0003] In the prior art, due to its good electrical conductivity, the carbon-coated porous structure greatly reduces the problems caused by volume expansion, such as egg yolk-shaped core-shell carbon-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/366H01M4/625Y02E60/10
Inventor 武俊伟张晓青黄丽玲施玉红崔彦辉唐启明顾文亮
Owner CHINA PETROLEUM & CHEM CORP
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