A kind of nitrogen-doped silicon-carbon composite negative electrode material and preparation method thereof

A negative electrode material, carbon composite technology, applied in the direction of negative electrode, nanotechnology for material and surface science, battery electrode, etc. The effect of capacity and cycle performance, strong coating uniformity, and stable structure

Active Publication Date: 2020-12-22
石家庄尚太科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material prepared by the chemical deposition method is fully contacted with silicon particles and carbon particles to improve its cycle performance, but the carbon particles are deposited on the surface of the silicon particles to improve the expansion of the silicon material. At the same time, the carbon material in the shell is due to Low capacity will adversely affect the capacity of silicon materials

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  • A kind of nitrogen-doped silicon-carbon composite negative electrode material and preparation method thereof
  • A kind of nitrogen-doped silicon-carbon composite negative electrode material and preparation method thereof
  • A kind of nitrogen-doped silicon-carbon composite negative electrode material and preparation method thereof

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Embodiment 1

[0032] A nitrogen-doped silicon-carbon composite negative electrode material, the negative electrode material is a core-shell structure, the core material is porous nano-silicon, the shell material is nitrogen-doped silicon carbide, and the thickness of the shell is 10-200nm;

[0033] The preparation method of the above-mentioned nitrogen-doped silicon-carbon composite negative electrode material comprises the following steps:

[0034] (1) Preparation of porous nano-silicon:

[0035] Dissolve 10g of silicon powder with a particle size of 5 μm in 1000ml of HF solution with a concentration of 5wt% and soak for 2h, filter, wash with water, and dry to obtain a nano-silicon precursor. Ammonia water, then stirred at 70°C for 3h, filtered, and then sintered in argon inert gas, the sintering temperature was 500°C, the time was 2.5h, and the temperature was lowered to room temperature to obtain porous nano-silicon;

[0036] (2) Preparation of nano-silicon / silicon carbide:

[0037] Th...

Embodiment 2

[0039] A nitrogen-doped silicon-carbon composite negative electrode material, the negative electrode material is a core-shell structure, the core material is porous nano-silicon, the shell material is nitrogen-doped silicon carbide, and the thickness of the shell is 10-200nm;

[0040] The preparation method of the above-mentioned nitrogen-doped silicon-carbon composite negative electrode material comprises the following steps:

[0041] (1) Preparation of porous nano-silicon:

[0042] Dissolve 10g of silicon powder with a particle size of 0.1 μm in 1000ml of HF solution with a concentration of 1wt%, soak for 2h, filter, wash with water, and dry to obtain a nano-silicon precursor. In concentrated ammonia water, then stirred at 60°C for 5h, filtered, and then sintered in argon inert gas, the sintering temperature was 400°C, the time was 3h, and the temperature was cooled to room temperature to obtain porous nano-silicon;

[0043] (2) Preparation of nano-silicon / silicon carbide:

...

Embodiment 3

[0046] A nitrogen-doped silicon-carbon composite negative electrode material, the negative electrode material is a core-shell structure, the core material is porous nano-silicon, the shell material is nitrogen-doped silicon carbide, and the thickness of the shell is 10-200nm;

[0047] The preparation method of the above-mentioned nitrogen-doped silicon-carbon composite negative electrode material comprises the following steps:

[0048] (1) Preparation of porous nano-silicon:

[0049] Dissolve 10g of silicon powder with a particle size of 10 μm in 1000ml of HF solution with a concentration of 10% and soak for 2h, filter, wash with water, and dry to obtain a nano-silicon precursor. Ammonia water, then stirred at 60°C for 1h, filtered, and then sintered in argon inert gas at a sintering temperature of 600°C for 2h, and cooled to room temperature to obtain porous nano-silicon;

[0050] (2) Preparation of nano-silicon / silicon carbide:

[0051] The porous nano-silicon obtained in ...

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Abstract

The invention provides a nitrogen-doped silicon-carbon composite negative electrode material. According to the negative electrode material, a silicon source gas, a carbon source gas and a nitrogen source gas are introduced, pyrolysis is carried out at a high temperature to generate free radical silicon and carbon so as to form nitrogen-doped silicon carbide, and the nitrogen-doped silicon carbidecoats the surface of the core porous nano silicon to form a nitrogen-doped silicon carbide material coating layer with stable structure, high coating uniformity and high density, so that the core is prevented from being directly contacted with an electrolyte, and the occurrence probability of side reaction is reduced. Meanwhile, the nitrogen-doped silicon carbide formed through chemical pyrolysishas higher capacity and conductivity than a carbon material on the one hand; and on the other hand, a coating layer material with a firm structure can be formed between silicon free radicals formed after pyrolysis of the silane gas and the core nano silicon, so that the binding force between the coating layer and the core is improved, the expansion of the material is reduced in the charging and discharging process, and the cycle performance is improved.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a nitrogen-doped silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] The performance of lithium-ion batteries is one of the important factors affecting the battery life of electric vehicles. With the continuous development of electric vehicles, the market's requirements for the energy density of lithium-ion batteries are gradually increasing. The market requires lithium-ion batteries to have higher energy density, cycle performance and rate performance. The silicon-carbon anode material is the key material for lithium-ion batteries, and has been valued by researchers for its high gram capacity and abundant resources. Therefore, it is widely used in high specific energy density lithium-ion batteries and other fields, but its expansion rate High conductivity and poor c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/386H01M4/624H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 许晓落刘尚安静
Owner 石家庄尚太科技股份有限公司
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