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Silicon-based composite material, lithium ion battery, and preparation method and application thereof

A technology of silicon-based composite materials and intermediate materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high production costs and unsatisfactory cycle performance, and achieve low cost and low pollution effects

Active Publication Date: 2013-06-19
SHANGHAI SHANSHAN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing silicon-based composite materials that the cycle performance is still not ideal or the production cost is high, and to provide a silicon-based composite material and its preparation method and use

Method used

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  • Silicon-based composite material, lithium ion battery, and preparation method and application thereof
  • Silicon-based composite material, lithium ion battery, and preparation method and application thereof
  • Silicon-based composite material, lithium ion battery, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0053] Get 2000g average molecular weight and be the polymethyl hydrogen siloxane of 800g / mol and 10g dicumyl peroxide (0.5wt%), add 10g (0.5wt%) particle diameter simultaneously and be the copper powder of 0.5 μ m, mix and put Stir in the reaction kettle, and pass through the nitrogen protection, gradually raise the temperature of the reaction kettle to 170 ° C, keep the reaction for 1 hour, cool to room temperature, and then discharge. Afterwards, the above-mentioned cross-linked cured product was calcined in a carbonization furnace at 600° C. for 6 hours. Get cooled discharge 1000g and 1000g particle diameter is 3 μm graphite and mix, add the aqueous solution 10kg that contains 2g (0.1wt%) CMC simultaneously and carry out wet ball milling. Spray drying is carried out when the particle size is 1 μm after ball milling. The air inlet temperature of the spray dryer is controlled at 200° C., the air outlet temperature is 100° C., and the spray frequency is 250 Hz. Spherical par...

Embodiment 2

[0055] Get 2000g of polymethylhydrogensiloxane with an average molecular weight of 5000g / mol and 100g of dicumyl peroxide (5wt%), add 100g (5wt%) of copper powder with a particle diameter of 1 μm at the same time, put into the reactor after mixing Stir in the middle, and pass through the nitrogen protection, gradually raise the temperature of the reactor to 350 ° C, keep the reaction for 8 hours, and discharge the material after cooling to room temperature. Afterwards, the above-mentioned crosslinked cured product was calcined in a carbonization furnace at 1000° C. for 6 hours. Get cooled discharge 1000g and 1000g particle diameter is 8 μ m graphite and mix, add the aqueous solution 10kg that contains 200g (10wt%) CMC simultaneously and carry out wet ball milling. Spray drying is carried out when the particle size is 10 μm after ball milling. The air inlet temperature of the spray dryer is controlled at 300° C., the air outlet temperature is 150° C., and the spray frequency is...

Embodiment 3

[0057] Get 2000g average molecular weight and be 2000g / mol polymethylhydrogen siloxane and 50g (2.5wt%) dicumyl peroxide, add 40g (2wt%) particle diameter simultaneously and be the copper powder of 0.5 μ m, put into after mixing Stir in the reaction kettle, and pass nitrogen protection, gradually raise the temperature of the reaction kettle to 250° C., keep the reaction for 4 hours, cool to room temperature, and then discharge. Afterwards, the above-mentioned cross-linked cured product was calcined in a carbonization furnace at 800° C. for 6 hours. 1000 g of discharged material after cooling is mixed with 1000 g of graphite with a particle size of 5 μm, and 10 kg of an aqueous solution containing 100 g (5 wt %) of CMC is added simultaneously for wet ball milling. Spray drying is carried out when the particle size is 4 μm after ball milling. The air inlet temperature of the spray dryer is controlled at 250° C., the air outlet temperature is 125° C., and the spray frequency is 3...

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Abstract

The invention discloses a preparation method of a silicon-based composite material, which is characterized in that: the reaction raw material is induced by peroxide in the presence of a sub-micron metal powder; polycarbosilane and / or polysiloxane is subjected to a crosslinking polymerization reaction to get the cross-linking and curing product; molecular weight of polycarbosilane or polysiloxane is 800-5000 g / mol; the polycarbosilane or the polysiloxane has at least one reactive H; the cross-linking and curing product is calcined at 600-1000 DEG C to get an intermediate material; the intermediate material, graphite and a binder are mixed, processed by wet ball milling, and dried in a spraying manner to obtain spherical particles; and the spherical particles are subjected to heat process at 400-800 DEG C. The present invention also provides a silicon-based composite material obtained by the method and application thereof, and a lithium ion battery taking the silicon-based composite material as a negative electrode material. The silicon-based composite material particles of the present invention are good in shape, and have good initial charge-discharge properties and electrical cycle performances. The preparation method of the present invention is suitable for industrialized production, low in environmental pollution and low in cost.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a silicon-based composite material and its preparation method and application. The invention relates to a lithium-ion battery containing the silicon-based composite material. Background technique [0002] At present, graphite raw materials are mostly used as lithium-ion battery anode materials in the market. The non-carbon-based anode materials studied mainly include: nitrides, silicon and silicides, tin-based oxides and tin compounds, new alloys, titanium oxides, etc. . Among them, silicon material has the advantage of large specific capacity as the anode material of lithium-ion batteries, and is one of the hotspots in the research of high-capacity lithium-ion anode materials. Although silicon has a maximum theoretical capacity of 4200mAh / g, its poor initial efficiency and cycle performance limit its commercial application. In order to meet the needs of high-capacity and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525H01M4/134
CPCY02E60/10
Inventor 董爱想沈龙乔永民牟国洪吴敏昌杜辉玉丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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