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A silicon-carbon composite negative electrode material and a preparation method thereof

A negative electrode material and silicon-carbon composite technology, applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve problems such as the specific capacity limitation of silicon materials, achieve good conductivity and increase tap density , the effect of uniform doping

Active Publication Date: 2018-12-14
INNER MONGOLIA SANXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes methods for preparing porous carbons (C) that contain silanes or dendritic structures called quantum tubules (CNTs). These techniques help control the size and shape of these tiny holes through evaporation processes such as solvent extraction, pyrolytic decomposition, plasma treatment, laser ablation, etc., resulting in highly precise CNT composites made up of small particles dispersed throughout them. By controllably adding different types of atoms into this structure, it becomes possible to create new functionalities like enhanced electrical properties, improved thermal stability, increased charge storage capabilities, and reduced volume changes when making battery components.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the expandability and electrical conduction properties (electron mobility), while also addressing issues related to decreasing volume changes caused by charging/dischargings cycles. Silane compounds like SiHxSiOy exhibit excellent thermal stability compared to traditional cathodes made up mostly of carbons called graphites. These compositions show improved electron migration rates without compromising capacities. They may even enhance the charge transfer process when used alone instead of adding another type of active ingredient. Additionally, they allow for better control over particle size distribution and increase flexibility in designing different types of cells that use these materials.

Method used

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  • A silicon-carbon composite negative electrode material and a preparation method thereof
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Embodiment 1

[0038] The preparation method of the silicon-carbon composite negative electrode material of this embodiment comprises the following steps:

[0039] 1) In the reaction kettle, add 100g of oxidized pitch and 1000mL of carbon disulfide, and stir rapidly at a speed of 100rpm for 30min, so that the oxidized pitch and carbon disulfide are evenly mixed. Then heat up to 90°C, add 3g of AlCl 3 and 12g of CCl 4 , carry out the cross-linking reaction for 1 hour, and then filter. The obtained solid composite material is heated to 1100° C. under an argon atmosphere, and kept for 2 hours; then cooled to room temperature, and the porous carbon material is obtained by pulverization and classification.

[0040] 2) Add 0.5g of γ-aminopropyltriethoxysilane to 100mL of N,N-dimethylformamide, disperse evenly, add 3g of the above-mentioned porous carbon material, mix evenly, and spray dry. The inlet temperature is 150° C., and a modified porous carbon material is obtained.

[0041] 3) Transfer ...

Embodiment 2

[0045] The preparation method of the silicon-carbon composite negative electrode material of this embodiment comprises the following steps:

[0046] 1) In the reaction kettle, add 50g of oxidized pitch and 1000mL of carbon disulfide, and stir rapidly at a speed of 50rpm for 30min, so that the oxidized pitch and carbon disulfide are evenly mixed. Then heat up to 80°C, add 5g of AlCl 3 and 15g of CCl 4 , carry out cross-linking reaction for 2 hours, and then filter. The obtained solid composite material is heated up to 1200° C. in an argon atmosphere, and kept for 1 hour; then cooled to room temperature, crushed and classified to obtain a porous carbon material.

[0047] 2) Add 0.1g of γ-(2,3-glycidoxy)propyltrimethoxysilane to 100mL of N-N-dimethylacetamide, disperse evenly, add 5g of the above porous carbon material, mix evenly and spray drying, the inlet temperature during spray drying is 100° C., and a modified porous carbon material is obtained.

[0048] 3) Transfer the ...

Embodiment 3

[0052] The preparation method of the silicon-carbon composite negative electrode material of this embodiment comprises the following steps:

[0053] 1) In the reaction kettle, add 150g of oxidized pitch and 1000mL of carbon disulfide, and stir rapidly at a speed of 200rpm for 30min, so that the oxidized pitch and carbon disulfide are evenly mixed. Then heat up to 100°C, add 1g of AlCl 3 and 10 g of CCl 4 , carry out the cross-linking reaction for 0.5h, and then filter, and raise the temperature of the obtained solid composite material to 1000° C. under an argon atmosphere, and keep it warm for 3 hours; then cool down to room temperature, pulverize and classify to obtain a porous carbon material.

[0054] 2) Add 1g of dimethyldimethoxysilane to 100mL of γ-butyrolactone, disperse evenly, add 1g of the above-mentioned porous carbon material, mix evenly, and spray dry. The inlet temperature during spray drying is 120°C. A modified porous carbon material is obtained.

[0055] 3)...

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Abstract

The invention relates to a silicon-carbon composite negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery materials. The preparation method of the silicon-carbon composite negative electrode material comprises the following steps: uniformly mixing a silane coupling agent and a porous carbon material in an organic solvent and performing spray drying to obtain a modified porous carbon material; in the presence of silane gas, performing heat preservation of the modified porous carbon material at 1000 to 1200 DEG C for 1 to 6 h; thencooling to 600 to 800 DEG C, and in the presence of a gas dopant, performing heat preservation for 1 to 6 h to obtain a silicon-carbon material, wherein the gas dopant is one or a combination of morethan one of NH3, N2O, NO and N2O4; and in the presence of carbon source gas, performing heat preservation of the silicon-carbon material at 700 to 900 DEG C for 1 to 12 h, thereby obtaining the silicon-carbon compositie negative electrode material. The silicon-carbon composite negative electrode material prepared by the invention has the characteristics of high specific capacity, high conductivityand good cycle performance, and can be applied to lithium ion batteries with high specific energy density.

Description

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Claims

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Application Information

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Owner INNER MONGOLIA SANXIN IND
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