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Multi-mixed and coated high compaction density silicon carbon anode material and preparation method thereof

A negative electrode material and multiple mixing technology, applied in the direction of battery electrodes, secondary batteries, electrical components, etc., can solve the problems of uneven carbon coating, difficulty in completeness, difficulty in increasing the compaction density of silicon carbon negative electrodes, etc., and achieve high pressure Solid density, simple preparation method, beneficial to large-scale industrial production

Active Publication Date: 2019-02-19
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to provide a method for preparing silicon-carbon anode materials with high compacted density by multiple mixing coatings, it overcomes the defects of uneven carbon coating on the surface of silicon-carbon materials and is difficult to complete, and solves the difficulty of silicon-carbon anodes through a simple method. The challenge of increasing compaction density

Method used

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  • Multi-mixed and coated high compaction density silicon carbon anode material and preparation method thereof
  • Multi-mixed and coated high compaction density silicon carbon anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The silicon powder and aluminum powder with an average particle size of 1um are wet-milled under a high-energy ball mill. The mass ratio of silicon powder to aluminum powder is 4:1, the speed of the ball mill is 700r / min, and the ball is milled for 5 hours to obtain a uniformly mixed slurry. After the solvent is calcined at 900°C under a nitrogen atmosphere, the sintering time is 10h. The obtained silicon powder powder is ground, sieved, and added to the alcohol solvent containing PVP. Ketjen Black is added under stirring conditions. The mass ratio of silicon powder, Ketjen Black, and PVP is 80:5:64. The solvent was evaporated, and the solid powder was obtained by calcination at 800°C for 3 hours under a nitrogen atmosphere; the obtained solid powder was added to a 1M HCl solution, stirred for 5 hours, filtered with suction, and dried to obtain primary particles; the primary particles were ground and screened. The medium-temperature coal-based pitch is added to the react...

Embodiment 2

[0039] The silicon powder and magnesium powder with an average particle size of 500nm are wet-milled under a high-energy ball mill. The mass ratio of silicon powder to magnesium powder is 9:1, the speed of the ball mill is 500r / min, and the ball mill is 10h to obtain a uniformly mixed slurry. After the solvent is calcined under a nitrogen atmosphere at 1000°C, the sintering time is 5h. The obtained silicon powder powder is ground, sieved, and added to the alcohol solvent containing polyacrylic acid, and acetylene black is added under stirring conditions. The mass ratio of silicon powder, acetylene black and polyacrylic acid is 70:5:55. Evaporate the solvent and calcinate at 1000°C for 3 hours under a nitrogen atmosphere to obtain a solid powder; add the obtained solid powder to 5M H 2 SO 4 In the solution, stir for 10 hours and then filter with suction. After drying, the primary particles are obtained; the primary particles are ground and sieved. Put the medium temperature coal...

Embodiment 3

[0042] The silicon powder and iron powder with an average particle diameter of 100nm are wet-milled in a high-energy ball mill. The mass ratio of silicon powder to iron powder is 4:1, the speed of the ball mill is 700r / min, the ball mill is 5h, and nitrogen is protected to obtain a uniformly mixed After evaporating the solvent, the slurry is calcined at 1000°C under a nitrogen atmosphere, and the sintering time is 2h. The obtained solid powder is ground and sieved, and added to an aqueous solvent containing glucose and chitosan. One-armed carbon nanotubes are added under stirring. The mass ratio of solid powder, one-armed carbon nanotubes, glucose and chitosan is 75: 3:30:30. Evaporate the solvent and calcinate at 1000°C for 3 hours under a nitrogen atmosphere to obtain a solid powder; add the obtained solid powder to 5M H 2 SO 4 In the solution, stir for 5 hours and filter with suction. After drying, the primary particles are obtained; the primary particles are ground and siev...

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Abstract

The invention discloses a Multi-mixed and coated high compaction density silicon carbon anode material and a preparation method thereof, overcomes the defects that the surface of a silicon carbon material at the present is non-uniformly coated and is hardly intact, and solves the problem that the compaction density of a silicon carbon anode is hard to increase by means of a simple method. The silicon carbon anode material comprises primary particles and secondary particles, wherein the primary particles are porous silicon carbon materials; porous silicon is uniformly dispersed in activated carbon, and the surfaces of the porous silicon and the activated carbon are coated with a pyrolytic carbon coating layer having a thickness of 3 to 50 nm; the porous silicon accounts for 5 to 50 percentby mass of the primary particles, and the activated carbon accounts for 20 to 30 percent by mass of the primary particles; the pyrolytic carbon accounts for 20 to 75 percent by mass of the primary particles; the secondary particles are agglomerates formed by uniformly dispersing the primary particles and graphite in the pyrolytic carbon, and have a particle size of 5 to 100 [mu]m; the total carboncontent of the silicon carbon anode material is 80 to 90 percent; and the compaction density is 1.1 to 1.7 g / cm<3>.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a high-pressure solid-density silicon carbon negative electrode material by mixing and coating multiple times. Background technique [0002] With the rapid development of the electric vehicle field, people have higher and higher requirements for the quality and capability density of power batteries. At present, most commercial lithium ion secondary batteries use graphite as the negative electrode material. Because the theoretical capacity of graphite negative electrode is low, only 372mAh / g, the specific capacity of commercial graphite negative electrode materials is generally 300-360mAh / g. It is difficult to improve the capacity density of the battery. Therefore, the development of battery anode materials with high specific capacity has become an urgent requirement of the lithium battery industry. [0003] Among many negative electrode materials, silicon ha...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/628H01M10/0525Y02E60/10
Inventor 闫俊杰曹泽正侯佳宜孟博
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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