Multiple times mixed coating high compacted density silicon carbon negative electrode material and preparation method thereof

A negative electrode material, multiple mixing technology, applied in the direction of battery electrodes, secondary batteries, structural parts, etc., can solve the problems of silicon-carbon negative electrodes that are difficult to increase the compaction density, uneven carbon coating, and difficult to complete, so as to benefit large-scale The effect of large-scale industrial production, high compaction density, and simple preparation method

Active Publication Date: 2019-05-07
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • 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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  • Multiple times mixed coating high compacted density silicon carbon negative electrode material and preparation method thereof
  • Multiple times mixed coating high compacted density silicon carbon negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The silicon powder and aluminum powder with an average particle size of 1um were wet ball milled under a high-energy ball mill. The mass ratio of silicon powder and aluminum powder was 4:1. After solvent, it was calcined at 900°C under nitrogen atmosphere, and the sintering time was 10h. The obtained silicon powder powder is ground and sieved, added to an alcohol solvent containing PVP, and Ketjen Black is added under stirring conditions, and the mass ratio of silicon powder powder, Ketjen Black, and PVP is 80:5:64. The solvent was evaporated to dryness, calcined at 800°C for 3 hours under nitrogen atmosphere to obtain solid powder; the obtained solid powder was added to 1M HCl solution, stirred for 5 hours, filtered with suction, and dried to obtain primary particles; the primary particles were ground and sieved. The medium-temperature coal-based pitch is added to the reaction kettle, and the temperature is raised to 300 degrees to form a liquid, and primary particles,...

Embodiment 2

[0038] The silicon powder and magnesium powder with an average particle size of 500nm were wet ball milled under a high-energy ball mill. The mass ratio of silicon powder and magnesium powder was 9:1. After the solvent, it was calcined at 1000°C under nitrogen atmosphere, and the sintering time was 5h. The obtained silicon powder powder is ground and sieved, added to an alcohol solvent containing polyacrylic acid, and acetylene black is added under stirring conditions, and the mass ratio of silicon powder powder, acetylene black and polyacrylic acid is 70:5:55. The solvent was evaporated to dryness, calcined at 1000 °C for 3 h under nitrogen atmosphere to obtain solid powder; the obtained solid powder was added to 5M H 2 SO 4 In the solution, after stirring for 10 hours, suction filtration, and drying to obtain primary particles; the primary particles are ground and sieved. Add medium temperature coal-based pitch into the reaction kettle, heat up to 300°C to form a liquid, a...

Embodiment 3

[0041] The silicon powder and iron powder with an average particle size of 100nm were wet ball milled under a high-energy ball mill. The mass ratio of silicon powder and iron powder was 4:1. The slurry was evaporated to dryness and then calcined at 1000°C in a nitrogen atmosphere, and the sintering time was 2h. The solid powder of gained is ground and sieved, joins in the water solvent containing glucose and chitosan, adds single-arm carbon nanotubes under stirring condition, and the mass ratio of solid powder, single-arm carbon nanotubes, glucose, chitosan is 75: 3:30:30. The solvent was evaporated to dryness, calcined at 1000 °C for 3 h under nitrogen atmosphere to obtain solid powder; the obtained solid powder was added to 5M H 2 SO 4 In the solution, after stirring for 5 hours, suction filtration, and drying to obtain primary particles; the primary particles are ground and sieved. The medium-temperature coal-based pitch was added to the reaction kettle, and the temperat...

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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 preparation method for preparing high-density silicon-carbon negative electrode materials by mixing and coating multiple times. Background technique [0002] With the rapid development of the field of electric vehicles, people have higher and higher requirements on the mass capacity density of power batteries. At present, most commercial lithium-ion secondary batteries use graphite as the negative electrode material. Due to the low theoretical capacity of graphite negative electrode, which is only 372mAh / g, the specific capacity of commercial graphite-based negative electrode materials is generally 300-360mAh / g. The improvement has been difficult to greatly improve the capacity density of the battery. Therefore, the development of anode materials for batteries with high specific capacity has become an urgent requirement of the lithium battery industry. [0003] Among many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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