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A carbon nanolayer-coated silicon anode material and its preparation and application

A negative electrode material, carbon nano-layer technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of unable to meet the performance requirements of high-performance power lithium-ion batteries, the effect is not ideal, electronic conduction limitations, etc., to achieve good electrical conductivity The network, the method is simple, and the effect of reducing the volume expansion

Active Publication Date: 2022-03-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the carbon-silicon negative electrodes coated by organic carbon source surface polymerization (CN103531760B, CN104466185A) or hydrothermal carbonization are monodisperse carbon-silicon nanospheres. The electronic conduction of the battery is greatly limited, and the effect is still not ideal enough to meet the performance requirements of high-performance power lithium-ion batteries.

Method used

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  • A carbon nanolayer-coated silicon anode material and its preparation and application
  • A carbon nanolayer-coated silicon anode material and its preparation and application
  • A carbon nanolayer-coated silicon anode material and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 6.8g of pentaerythritol into a flask, add 29.40g of phosphoric acid, stir to reduce pressure (vacuum degree is 0.1MPa), heat to 120°C, and keep warm for 1.5h to obtain light yellow transparent viscous pentaerythritol phosphate liquid. Add 120mL of ethanol and 16.38g of melamine into another round bottom flask, stir thoroughly for 3h, pour the pentaerythritol phosphate synthesized in the previous step into the melamine with ethanol dispersant, heat to 80°C, stir and reflux for 6h, rotate Evaporate the precursor, mix 2g of the precursor with 200mg of silicon oxide spheres with a diameter of 30nm, put the mixture in a quartz boat, and raise the temperature to 350°C at a rate of 5°C / min under a nitrogen atmosphere, keep it for 0.5h, and continue to Raise the temperature to 950°C at a heating rate of 5°C / min, keep it for 2h, cool to room temperature and take it out. The magnesium powder and the carbonized carbon-silicon composite are in a mass ratio of 3:1, heated up t...

Embodiment 2

[0028] Weigh 6.8g of pentaerythritol into a flask, add 29.40g of phosphoric acid, stir to reduce pressure (vacuum degree is 0.1MPa), heat to 120°C, and keep warm for 1.5h to obtain light yellow transparent viscous pentaerythritol phosphate liquid. Add 120mL of ethanol and 16.38g of melamine into another round bottom flask, stir thoroughly for 3h, pour the pentaerythritol phosphate synthesized in the previous step into the melamine with ethanol dispersant, heat to 80°C, stir and reflux for 6h, rotate Evaporate the precursor, mix 2g of the precursor with 100mg of silicon oxide balls with a diameter of 50nm, put the mixture in a quartz boat, and raise the temperature to 350°C at a rate of 5°C / min under a nitrogen atmosphere, keep it for 0.5h, and continue to Raise the temperature to 950°C at a heating rate of 5°C / min, keep it for 2h, cool to room temperature and take it out. The magnesium powder and the carbonized carbon-silicon composite are in a mass ratio of 3:1, heated up to ...

Embodiment 3

[0030] Weigh 6.8g of pentaerythritol into a flask, add 29.40g of phosphoric acid, stir to reduce pressure (vacuum degree is 0.1MPa), heat to 120°C, and keep warm for 1.5h to obtain light yellow transparent viscous pentaerythritol phosphate liquid. Add 120mL of ethanol and 16.38g of melamine into another round bottom flask, stir thoroughly for 3h, pour the pentaerythritol phosphate synthesized in the previous step into the melamine with ethanol dispersant, heat to 80°C, stir and reflux for 6h, rotate Evaporate the precursor, mix 2g of the precursor with 100mg of silicon oxide balls with a diameter of 50nm, put the mixture in a quartz boat, and raise the temperature to 350°C at a rate of 5°C / min under a nitrogen atmosphere, keep it for 0.5h, and continue to Raise the temperature to 950°C at a heating rate of 5°C / min, keep it for 2h, cool to room temperature and take it out. The magnesium powder and the carbonized carbon-silicon composite are in a mass ratio of 3:1, heated up to ...

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Abstract

The invention relates to the technical field of lithium ion negative electrode materials, in particular to a carbon nano-layer coated silicon negative electrode material and a preparation method thereof, the preparation method comprising the following steps: A, preparing a carbon precursor; B, preparing a carbon silicon precursor; C 1. Preparation of carbon nano-layer coated silicon negative electrode material. The prepared carbon-silicon negative electrode material is a nano-sheet structure of porous carbon-coated nano-silicon, and the coated silicon nano-particles are distributed on the surface of the carbon layer. The coating structure greatly reduces the volume expansion of silicon; the porous structure with high porosity effectively alleviates the influence of silicon expansion on the electrode structure; and the carbon nanolayer provides a better conductive network. The coating method of the invention is simple and convenient, the source of raw materials is wide, the price is low, the process conditions are easy to control, the operation cost is low, and the industrialization prospect is great. Compared with the current coating method, it has the advantages of uniform coating layer and fast coating speed. The carbon nanometer layer-coated silicon negative electrode material of the invention has high specific capacity, and excellent cycle performance and rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion negative electrode materials, in particular to a carbon nano-layer coated silicon negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a widely used energy storage device, has the advantages of high energy density, small self-discharge, wide operating voltage range, no memory effect, long service life, and no environmental pollution. The final decisiveness of lithium-ion battery performance The factor is the electrode material, among which the negative electrode material plays a vital role in improving the performance of lithium-ion batteries. At present, the application of negative electrode materials is mainly based on traditional graphite materials, but the specific capacity of graphite is close to the theoretical value of 372mAh / g, and there is little room for improvement. It has been unable to meet the needs of high specific e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王素力戚甫来孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI