Silicon-carbon composite cathode material of lithium ion battery and preparation thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve problems such as improving practicality and insufficient battery performance, and achieves excellent charging and discharging performance, simple production work, and battery energy. high density effect

Inactive Publication Date: 2009-01-07
湖南海容新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the violent agglomeration of ultrafine materials during the cycle is not enough to improve the performance of the battery to practical use, so it is proposed to use composite materials

Method used

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  • Silicon-carbon composite cathode material of lithium ion battery and preparation thereof
  • Silicon-carbon composite cathode material of lithium ion battery and preparation thereof
  • Silicon-carbon composite cathode material of lithium ion battery and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of silicon-carbon composite anode materials with spherical coating structure

[0030] First, 100g of silicon phase particles with a particle size of 5 μm and 750g of natural graphite powder (tap density 1.00g / cm 3 , specific surface area 5.9m 2 / g, D50=19 μm, degree of graphitization 98%) mechanically high-energy ball milling in hydrogen or nitrogen atmosphere for 5 hours to obtain a composite matrix. Then get 150g redox resin and dissolve in 500g toluene, then pour the solution into a small reactor with a heating device, gradually add the prepared composite particle matrix under stirring, start heating to 80°C after stirring for 3 hours and Continue to stir, pass the volatilized toluene into the condenser to recover, and after another hour, release the material and cool it to room temperature, then press it into a block and put it into a graphite crucible in a tunnel kiln with protective gas at a heating rate of 50°C / hour Raise to 1000°C and keep it warm ...

Embodiment 2

[0038] Preparation of silicon-carbon composite anode materials with spherical coating structure

[0039] First, 100g of silicon phase particles with a particle size of 0.1 μm and 750g of natural graphite powder (tap density 1.00g / cm 3 , specific surface area 5.9m 2 / g, D50=19 μm, degree of graphitization 98%) mechanically high-energy ball milling in hydrogen or nitrogen atmosphere for 5 hours to obtain a composite matrix. Then get 150g redox resin and dissolve in 500g toluene, then pour the solution into a small reactor with a heating device, gradually add the prepared composite particle matrix under stirring, start heating to 80°C after stirring for 3 hours and Continue to stir, pass the volatilized toluene into the condenser to recover, and after another hour, release the material and cool it to room temperature, then press it into a block and put it into a graphite crucible in a tunnel kiln with protective gas at a heating rate of 50°C / hour Raise to 1000°C and keep it war...

Embodiment 3

[0043] Preparation of silicon-carbon composite anode materials with spherical coating structure

[0044] First, 50g of silicon phase particles with a particle size of 0.1 μm and 800g of natural graphite powder (tap density 1.00g / cm 3 , specific surface area 5.9m 2 / g, D50=19 μm, degree of graphitization 96%) mechanically high-energy ball milling in hydrogen or nitrogen atmosphere for 5 hours to obtain a composite matrix. Then get 150g redox resin and dissolve in 500g toluene, then pour the solution into a small reactor with a heating device, gradually add the prepared composite particle matrix under stirring, start heating to 80°C after stirring for 3 hours and Continue to stir, pass the volatilized toluene into the condenser to recover, and after another hour, release the material and cool it to room temperature, then press it into a block and put it into a graphite crucible in a tunnel kiln with protective gas at a heating rate of 50°C / hour Raise to 1000°C and keep it warm...

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Abstract

The invention provides a silicon-carbon composite cathode material for preparing a lithium-ion battery at the room temperature and a preparation method thereof. The composite cathode material is a material with a nuclear shell structure and comprises the following proportional elements: 0.01-10% of simple substance silicon and 90-99.9% of carbon. With regard to the preparation method, silicon powder and graphite are mixed for ball grinding and then added with bitumen or polymer cladding material for ball grinding again, after the treatment of carbonization, the mixture is crushed and sieved to obtain the material containing 0.01-10wt% of silicon and 10-99.9% of carbon. The capacity of the material is more than 350mAh/g, the cycle efficiency of the material is larger than 90% for the first time, and keeps larger than 80% after 200 cycles, and the material has good charging and discharging property.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a silicon-carbon composite negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries have developed rapidly. Today lithium-ion batteries have been widely used in various fields of civil and military use. [0003] At present, the negative electrode material of commercial lithium-ion batteries uses graphite-based carbon materials, but its theoretical specific capacity is only 372mAh / g, which limits the further improvement of the specific energy of lithium-ion batteries and cannot meet the growing demand for high-energy portable mobile power supplies. , and carbon materials have problems such as low charge-discharge capacity, poor high-rate charge-dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/04B01J19/00H01M4/38
CPCY02E60/10
Inventor 许晓落贺小红
Owner 湖南海容新材料有限责任公司
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