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A kind of silicon carbon negative electrode material and preparation method thereof

A negative electrode material, silicon carbon technology, applied in the field of silicon carbon negative electrode materials and its preparation, can solve the problems of reduced electrical conductivity and cycle life, high irreversible capacity, lack of conductive network, etc., to improve electrical conductivity and improve cycle performance , Improve the effect of structural stability

Active Publication Date: 2021-09-17
余姚市海泰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the first time, silicon-based anode materials have high irreversible capacity, poor stability, and huge volume expansion, which reduces electrical conductivity and cycle life.
The published Chinese patent document CN106711431A coats the surface-treated silicon powder with polydopamine as a battery negative electrode material to improve the structure and cycle stability, but the polydopamine in this invention is in a high molecular state without carbonization, so the conductivity Poor, will increase internal resistance, lack of stable conductive network

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A. Put 0.5% silicon elemental particles with a particle size of 0.1 μm into the Piranha solution prepared by 98% sulfuric acid and 30% hydrogen peroxide at a volume ratio of 7:3, react in an ultrasonic bath at 75°C for 30 minutes, and then pump Filtering and washing until the filtrate is neutral, drying in vacuum to obtain surface hydroxylated silicon particles;

[0023] B. Acetone and water are formulated into a solution at a volume ratio of 10:1, and N-3-(trimethoxysilyl)propylvinyldiamine and acetone solution are mixed at a volume ratio of 1:500 to obtain N-3- (Trimethoxysilyl)propylvinyldiamine in acetone; then disperse the surface hydroxylated silicon / siloxane particles into N-3-(trimethoxysilyl)propylvinyldiamine in acetone After separation in 1 hour, unassembled N-3-(trimethoxysilyl)propylvinyldiamine molecules were washed away with acetone and deionized water for 3 minutes, and dried in vacuum to obtain surface-assembled N-3 -(trimethoxysilyl)propylvinyldiamine...

Embodiment 2

[0029] A. Put 2% of silicon oxide particles with a particle size of 10 μm into the Piranha solution prepared by 98% sulfuric acid and 30% hydrogen peroxide at a volume ratio of 7:3, react in an ultrasonic bath at 75°C for 30 minutes, and then filter with suction , washing until the filtrate is neutral, and drying in vacuum to obtain surface hydroxylated silicon particles;

[0030] B. Acetone and water are formulated into a solution at a volume ratio of 5:1, and N-3-(trimethoxysilyl)propylvinyldiamine and acetone solution are mixed at a volume ratio of 1:2000 to obtain N-3- (Trimethoxysilyl)propylvinyldiamine in acetone; then disperse the surface hydroxylated silicon / siloxane particles into N-3-(trimethoxysilyl)propylvinyldiamine in acetone After 2 hours, it was separated, and the unassembled N-3-(trimethoxysilyl)propylvinyldiamine molecules were washed away with acetone and deionized water for 1 minute, and vacuum-dried to obtain surface-assembled N-3 - silicon / silicone parti...

Embodiment 3

[0035] A. Put 1.5% silicon elemental particles with a particle size of 0.1 μm into the Piranha solution prepared by 98% sulfuric acid and 30% hydrogen peroxide at a volume ratio of 7:3, react in an ultrasonic bath at 75°C for 30 minutes, and then filter with suction , washing until the filtrate is neutral, and drying in vacuum to obtain surface hydroxylated silicon particles;

[0036] B. Acetone and water are formulated into a solution at a volume ratio of 8:1, and N-3-(trimethoxysilyl)propylvinyldiamine and acetone solution are mixed at a volume ratio of 1:1000 to obtain N-3- (Trimethoxysilyl)propylvinyldiamine in acetone; then disperse the surface hydroxylated silicon / siloxane particles into N-3-(trimethoxysilyl)propylvinyldiamine in acetone After 1.5 hours, it was separated, and the unassembled N-3-(trimethoxysilyl)propylvinyldiamine molecules were washed away with acetone and deionized water for 2 minutes, followed by vacuum drying to obtain surface-assembled N-3 - silico...

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Abstract

The invention discloses a silicon-carbon negative electrode material and a preparation method thereof, which sequentially include: silicon / silicon oxide particles, N-3-(trimethoxysilyl) propyl vinyl diamine molecular layer, and carbon nanotubes from the inside to the outside. Conductive layer, polydopamine carbonized layer, the silicon / silicon oxygen particles are polyvalent oxides of silicon or silicon or a mixture thereof, the N-3-(trimethoxysilyl) propyl vinyl diamine molecular layer, The thickness is 1-10 μm; the polydopamine macromolecule in the polydopamine carbon layer uniformly forms a film on the outermost layer to cover silicon / silicon oxide particles and carbon nanotubes, and the film thickness is 0.01-3 μm. The synergistic effect of the three-layer structure and silicon / silicon oxide particles can significantly improve the structural stability and conductivity of silicon-based anode materials, and further improve the rate performance and cycle performance. The preparation method of the invention combines molecular self-assembly technology and in-situ polymerization technology and is applied to the field of negative electrode materials of lithium ion batteries, and has simple process, convenient operation and short preparation period.

Description

technical field [0001] The invention relates to a silicon-carbon negative electrode material and a preparation method thereof. Background technique [0002] With the vigorous development of my country's new energy industry, lithium-ion batteries have become the first choice for battery systems for electric vehicles and large-scale energy storage equipment. At present, graphite-based carbon-based anode materials widely used in lithium-ion batteries have low capacity and cannot meet the requirements of high-performance lithium-ion battery anodes. The theoretical capacity of silicon material is as high as 4200mAh / g, the potential of lithium ion extraction is low, the platform discharge is stable and long, the safety performance is high, and the environment is friendly and pollution-free. These advantages make it attract great attention and are considered to be the most commercial in the market It is the preferred alternative material for carbon anode materials with promising a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/485H01M4/622H01M4/625Y02E60/10
Inventor 张言车欢刘丽媚齐士博
Owner 余姚市海泰贸易有限公司
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