Silicon-carbon alloy cathode material used in lithium ion battery, and preparation method thereof
A lithium-ion battery, alloy anode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of pole piece powdering, industrialization obstacles of silicon anode materials, falling off, etc., and achieves simple preparation process, good cycle performance, Low cost of raw materials
A lithium-ion battery, alloy anode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of pole piece powdering, industrialization obstacles of silicon anode materials, falling off, etc., and achieves simple preparation process, good cycle performance, Low cost of raw materials
CN102496701AInactive Publication Date: 2012-06-13BTR NEW MATERIAL GRP CO LTD
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[0025] The preparation method of the lithium-ion battery silicon-carbon alloy negative electrode material of the present invention comprises the following steps of obtaining the silicon-carbon alloy negative electrode material for lithium-ion batteries by coating amorphous carbon-coated silicon powder precursor particles by chemical vapor deposition:
[0026] 1. According to the mass ratio, weigh 1 to 9% of the CVD catalyst precursor, 1 to 5% of the additive and 86 to 98% of the 20 to 250nm silicon powder, put them into the ultrasonic pool, press the catalyst precursor, the additive and the silicon powder The ratio of the sum of the powder mass to the mass g of the organic solvent to the volume L is 100:0.5~1, the catalyst precursor, additives and silicon powder are mixed in the organic solvent, and the ultrasonic power is 1600W / m 2 , and shaken for 1-20 hours to obtain a slurry.
[0027] The CVD catalyst precursor is more than one of iron salt, nickel salt and copper salt iro...
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Abstract
The invention discloses a silicon-carbon alloy cathode material used in a lithium ion battery, and a preparation method thereof. The invention aims at improving the cycling performance of the silicon-carbon alloy cathode material. According to the silicon-carbon alloy cathode material, silicon powder particles with particle sizes of 20-250nm are adopted as substrates; carbon nano-tubes and amorphous carbon are coated on the surfaces of the substrates; the thicknesses of the carbon nano-tubes and amorphous carbon are 100-300nm; the carbon nano-tubes and amorphous carbon are short-strip-shaped, block-shaped, or layered hollow-structured cracked carbon. The preparation method provided by the invention comprises steps of: slurry preparing, drying and powder preparing, calcining, and chemical vapor depositing. Compared to prior arts, the silicon-carbon alloy cathode material is advantaged in high specific capacity, good cycling performance, a capacity greater than 1000mAh / g, and a capacity maintenance rate above 90% with 20 times of circulation. The preparation method provided by the invention is advantaged in simple technology and low raw material cost. The material and the method provided by the invention are suitable for various high-capacity lithium ion battery cathode materials.
Description
technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, no memory effect, long life, green and pollution-free, and low self-discharge. They have become the preferred power supply equipment for various portable electronic products and are inseparable from people's daily life. With the increasingly severe global environmental problems, the concept of "low carbon" is becoming more and more popular. The many advantages of lithium-ion batteries make lithium-ion batteries expected to replace petroleum products as ideal power sources for portable electric tools and electric vehicles. Play a more important role in human production and life. [0003] The negative electrode materials of lithium-ion batteries in th...
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Patent Timeline
13 Jun 2012
Publication
CN102496701A
- IPC
- H01M4/38; H01M4/134; H01M4/1395
- CPC
- Y02E60/122; Y02E60/10
- Inventors
- 岳敏; 姜身永