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High-performance silicon-carbon cathode material and preparation method thereof

A negative electrode material, high-performance technology, applied in the direction of negative electrode, active material electrode, battery electrode, etc., can solve the problems of poor electrochemical performance, thick pole piece, etc., achieve the effect of compact strength, reduce specific surface area, and excellent processing performance

Active Publication Date: 2018-03-09
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, one of the objects of the present invention is to provide a method for preparing a high-performance silicon-carbon negative electrode material. Under the same conditions, the pole piece is thicker and the electrochemical performance is poor.

Method used

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  • High-performance silicon-carbon cathode material and preparation method thereof
  • High-performance silicon-carbon cathode material and preparation method thereof
  • High-performance silicon-carbon cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Take 2 kg of micron silicon powder with a median particle size of 3 μm and a silicon content greater than 99%, add it to 18 kg of ethanol solvent, ultrasonically disperse it for 30 minutes, and pour it into the cavity of an ultrafine ball mill. Zirconia balls with a diameter of 0.3 mm were used as the ball milling medium, and the ball-to-material ratio (mass ratio) was 10:1, and ball milled at a speed of 1800 rpm for 10 hours to obtain a nano-silicon dispersion. Add 3.4 kg of flake graphite to the nano-silicon dispersion, and disperse by ball milling at 1000 rpm for 1 hour to obtain a uniform mixed slurry. The mixed slurry is spray-dried to obtain granular composite powder.

[0057] Take 2kg of the above spray-dried powdery intermediate product and 1kg of modified asphalt, heat kneading at 160-180°C for 2 hours; heat the kneaded product at 160-180°C for rubber packing with a thickness of about 2mm, and cool After crushing into a powder material; then put the powder mat...

Embodiment 2

[0062] Take 2 kg of micron silicon powder with a median particle size of 3 μm and a silicon content greater than 99%, add it to 18 kg of ethanol solvent, ultrasonically disperse it for 30 minutes, and pour it into the cavity of an ultrafine ball mill. Zirconia balls with a diameter of 0.3 mm were used as the ball milling medium, and the ball-to-material ratio (mass ratio) was 10:1, and ball milled at a speed of 1800 rpm for 10 hours to obtain a nano-silicon dispersion. Add 3.4 kg of flake graphite to the nano-silicon dispersion, and disperse by ball milling at 1000 rpm for 1 hour to obtain a uniform mixed slurry. The mixed slurry is spray-dried to obtain granular composite powder.

[0063] Take 2kg of the above-mentioned spray-dried powdery intermediate product and 1kg of modified coal tar pitch, heat kneading at 120-140°C for 2 hours; heat-roll the kneaded product at 120-140°C, and pack it into a rubber with a thickness of about 2mm. After cooling, it is crushed into a powde...

Embodiment 3

[0065] Take 2 kg of micron silicon powder with a median particle size of 3 μm and a silicon content greater than 99%, add it to 18 kg of ethanol solvent, ultrasonically disperse it for 30 minutes, and pour it into the cavity of an ultrafine ball mill. Zirconia balls with a diameter of 0.3 mm were used as the ball milling medium, and the ball-to-material ratio (mass ratio) was 10:1, and ball milled at a speed of 1800 rpm for 10 hours to obtain a nano-silicon dispersion. Add 3.4 kg of flake graphite to the nano-silicon dispersion, and disperse by ball milling at 1000 rpm for 1 hour to obtain a uniform mixed slurry. The mixed slurry is spray-dried to obtain granular composite powder.

[0066] Take 2kg of the above-mentioned spray-dried powdery intermediate product and 1kg of modified coal tar pitch, heat kneading at 120-140°C for 2 hours; heat-roll the kneaded product at 120-140°C, and pack it into a rubber with a thickness of about 2mm. After cooling, it is crushed into a powde...

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Abstract

The invention relates to a high-performance silicon-carbon cathode material and a preparation method thereof. The preparation method comprises the following steps: (1) dispersing silicon into a solvent, carrying out liquid-phase ball-milling, so as to obtain nano-silicon dispersion liquid, adding graphite, and carrying out liquid-phase ball milling so as to uniformly mix nano-silicon with graphite; (2) carrying out granulation on slurry obtained the step (1), so as to obtain graphite / nano-silicon composite particles; (3) carrying out granulation on the product of the step (2) and asphalt by virtue of a mixed kneading-pressing-crushing method, so as to obtain graphite / nano-silicon / asphalt composite particles, and carrying out mechanical fusion so as to realize spheroidization and uniform coating of the graphite / nano-silicon / asphalt composite particles in one step; and (4) carrying out carbonization, scattering and sieving, so as to obtain the high-performance silicon-carbon cathode material. The preparation method is simple and low in cost and can be used for easily producing the high-performance silicon-carbon cathode material in large scale.

Description

technical field [0001] The invention belongs to the technical field of battery negative electrode materials, and in particular relates to a high-performance silicon-carbon negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices, large-scale energy storage power stations and electric vehicles because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge effect, and environmental friendliness. At present, graphite-based anode materials are mainly used as anode materials for commercialized lithium-ion batteries, but their theoretical specific capacity is only 372mAh / g, which cannot meet the requirements for the development of lithium-ion batteries with higher specific energy and high power density in the future. Therefore, finding high-capacity anode materials to replace carbon has become an important development dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 李进杨娟玉卢世刚曹宗双赵春荣于冰史碧梦
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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