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Silicon-carbon composite material, and preparation method and application thereof

A silicon-carbon composite material and mixed slurry technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low charging and discharging efficiency, fast capacity decay, unsuitable for industrial production, etc., and achieve low pollution and simple preparation method. Effect

Active Publication Date: 2013-07-17
CHENZHOU SHANSHAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to provide a silicon-carbon composite material and its preparation method and application for the existing silicon-carbon composite materials with low charge and discharge efficiency, fast capacity decay, and unsuitability for industrial production.

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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

Examples

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Effect test

Embodiment 1

[0038] The preparation method of described emulsified asphalt comprises the following steps:

[0039] Prepare 0.33Kg of an aqueous solution containing 2.5g of octadecyltrimethylammonium chloride and 1.0g of nonylphenol polyoxyethylene ether, then add 0.5Kg of molten asphalt to the above aqueous solution to obtain a mixture, and stir the above mixture for 8 minutes at 2500rpm , that is, emulsified asphalt.

[0040] Take 1.0Kg of silicon oxide powder and place it in a crucible, heat it in a roasting furnace while passing nitrogen gas, when the temperature rises to 800°C, keep it warm for another 2 hours, cool to room temperature and discharge, and obtain a silicon oxide material with elemental silicon formation . Take 0.5Kg of natural graphite with a particle size of 2μm and the silicon oxide material obtained above, and add it to 1.67Kg of emulsified asphalt liquid containing 1.0Kg of pure asphalt (medium temperature asphalt, softening point: 70-90°C) for mixing, and the stirr...

Embodiment 2

[0043] The preparation method of emulsified asphalt is as described in Example 1.

[0044] Take 1.0Kg of silicon oxide powder and place it in a crucible, heat it in a roasting furnace while passing nitrogen gas, when the temperature rises to 1000°C, keep it warm for 6 hours, cool to room temperature and discharge, and obtain silicon oxide material with elemental silicon . Take 1.0Kg of artificial graphite (its model is FSN series) with a particle size of 25μm and the silicon oxide material obtained above, and add it to 1.28Kg of emulsified asphalt liquid containing 0.77Kg of pure asphalt (high-temperature asphalt, whose softening point is 90-120°C) mix in. The stirring speed is 20 rpm, the stirring time is 10 minutes, and the emulsified asphalt mixture slurry is obtained after mixing evenly. Put the mixed slurry in a reaction kettle with a stirring device, the stirring speed is 50rpm, nitrogen gas is passed through the reaction kettle while stirring, when the temperature is ...

Embodiment 3

[0046] The preparation method of emulsified asphalt is as described in Example 1.

[0047] Take 1.0Kg of silicon oxide powder and place it in a crucible, heat it in a roasting furnace while passing argon gas, when the temperature rises to 900°C, keep it warm for another 3 hours, cool to room temperature and discharge, and obtain silicon oxide with elemental silicon. materials. Take 2.0Kg of artificial graphite with a particle size of 10μm (its model is 3H series) and natural graphite mixture (1:1 weight ratio), the silicon oxide material obtained above, and add it to 0.51Kg of pure asphalt (extra-high temperature asphalt, softening point is 240 ~270℃) in 0.85Kg emulsified asphalt liquid for mixing. The stirring speed is 30 rpm, the stirring time is 20 minutes, and the emulsified asphalt mixture slurry is obtained after mixing evenly. Put the mixed slurry in a reaction kettle with a stirring device, the stirring speed is 60rpm, the reaction kettle is stirred while passing arg...

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Abstract

The invention discloses a silicon-carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: (1) roasting silicon monoxide for 2 to 6 h at a temperature of 800 to 1100 DEG C under the protection of inert gas so as to obtain a silicon oxide material containing elemental silicon; (2) mixing the silicon oxide material with graphite and emulsified asphalt to prepare mixed slurry; (3) stirring and heating the mixed slurry to a temperature of 120 to 150 DEG C under the protection of inert gas, maintaining the temperature for 3 h, carrying out continuous heating to a temperature of 300 to 600 DEG C, maintaining the temperature for 4 to 6 h and carrying out cooling to room temperature so as to obtain an emulsified asphalt-coated silicon-carbon composite material; and (4) subjecting the emulsified asphalt-coated silicon-carbon composite material to carbonizing treatment under the protection of inert gas so as to obtain the silicon-carbon composite material. The preparation method is simple, is applicable to industrial production and poses little pollution to the environment. The prepared silicon-carbon composite material can be directly used as a negative electrode material of a lithium ion battery, and a battery prepared from the material has great initial capacity and a high capacity retention ratio after multiple cycles of charging / discharging.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-carbon composite material and its preparation method and application. Background technique [0002] Commercialized lithium-ion battery anode materials are mostly graphite. At present, the high-end graphite anode materials successfully developed and used have a capacity of 365mAh / g and a compacted density of 1.7-1.75g / cm 3 However, the theoretical capacity of graphite is only 372mAh / g, and the development of graphite materials is working towards the limit direction of high capacity and high compaction density. The market urgently needs a negative electrode material with high energy density to replace the current graphite-based materials. Silicon has a theoretical capacity of 4200mAh / g and a low delithiation potential platform, making it one of the most promising anode materials for lithium-ion batteries at present. However, due to the huge volume change of silicon d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/587H01M4/133H01M4/134
CPCY02E60/10
Inventor 董爱想沈龙乔永民李辉吴敏昌
Owner CHENZHOU SHANSHAN NEW MATERIAL
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