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Silicon-carbon negative electrode material for lithium ion battery and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor stability and insignificant volume expansion of silicon-based negative electrode materials, and achieve good performance.

Inactive Publication Date: 2021-03-16
阜阳申邦新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of the silicon-based negative electrode material obtained by this method is poor, and it is not obvious for improving the volume expansion of silicon during charging and discharging.

Method used

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  • Silicon-carbon negative electrode material for lithium ion battery and lithium ion battery
  • Silicon-carbon negative electrode material for lithium ion battery and lithium ion battery

Examples

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Effect test

Embodiment 1

[0025] A silicon-carbon negative electrode material for a lithium-ion battery, the preparation method comprising:

[0026] (1), 1g of nano silicon powder (average particle size 100nm) was added to 10mL of hydrofluoric acid solution (10wt%) and stirred for 10min, centrifuged to obtain a solid, washed 3 times with water, then dried at 80°C for 2h, then Insulate the dried silicon powder at 500°C for 10 minutes to obtain surface hydroxylated silicon powder;

[0027] (2), under nitrogen protection, add 2.16g 3,3'-dihydroxybenzidine and 4.00g 4,4'-diaminodiphenyl ether into 60mL anhydrous N,N-dimethylacetamide and stir evenly , then add 8.83g 3,3',4,4'-biphenyltetracarboxylic dianhydride, stir and react at room temperature for 5h to obtain a polyamic acid solution, add 1.8mL pyridine to the polyamic acid solution as imide Add 5 mL of acetic anhydride as a dehydrating agent after the dispersion is complete, heat up to 80°C, stir and react for 4 hours, and cool to room temperature to...

Embodiment 2

[0030] A silicon-carbon negative electrode material for a lithium-ion battery, the preparation method comprising:

[0031] (1), 1g of nano silicon powder (average particle size 100nm) was added to 10mL of hydrofluoric acid solution (10wt%) and stirred for 10min, centrifuged to obtain a solid, washed 3 times with water, then dried at 80°C for 2h, then Insulate the dried silicon powder at 500°C for 20 minutes to obtain surface hydroxylated silicon powder;

[0032] (2), under nitrogen protection, add 2.16g 3,3'-dihydroxybenzidine and 4.00g 4,4'-diaminodiphenyl ether into 60mL anhydrous N,N-dimethylacetamide and stir evenly , then add 6.73g 1,2,4,5-cyclohexanetetracarboxylic dianhydride, stir and react at room temperature for 5h to obtain a polyamic acid solution, add 1.8mL pyridine to the polyamic acid solution as an imidization agent After the dispersion is complete, add 5 mL of acetic anhydride as a dehydrating agent, heat up to 80°C, stir and react for 4 hours, and cool to ro...

Embodiment 3

[0035] A silicon-carbon negative electrode material for a lithium-ion battery, the preparation method comprising:

[0036] (1), 1g of nano-silica powder (average particle diameter 100nm) is added in 10mL sodium hydroxide aqueous solution (10wt%), after heating up to 50 DEG C, stir and react for 30min, centrifuge to obtain the solid, wash 3 times with water, and then wash at 80 Dry at ℃ for 2 hours, and then heat the dried silicon powder at 600℃ for 5 minutes to obtain surface hydroxylated silicon powder;

[0037] (2), under nitrogen protection, add 2.16g 3,3'-dihydroxybenzidine and 4.33g 4,4'-diaminodiphenylsulfide into 60mL of anhydrous N,N-dimethylacetamide and stir Evenly, add 8.83g 3,3',4,4'-biphenyltetracarboxylic dianhydride, stir and react at room temperature for 5h to obtain a polyamic acid solution, add 1.8mL pyridine to the polyamic acid solution as an imide Add 5 mL of acetic anhydride as a dehydrating agent after the dispersion is complete, heat up to 80°C, stir f...

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Abstract

The invention provides a silicon-carbon negative electrode material for a lithium ion battery. The silicon-carbon negative electrode material is prepared according to the following steps: firstly, carrying out surface treatment on silicon powder by adopting an acid or alkali compound, and then carrying out high-temperature treatment to obtain surface hydroxylated silicon powder; then mixing the surface hydroxylated silicon powder with hydroxyl-containing polyimide to obtain a polyimide-coated silicon powder composite material; and finally, carbonizing the polyimide-coated silicon powder composite material to obtain the silicon-carbon negative electrode material for the lithium ion battery. The silicon-carbon negative electrode material disclosed by the invention has high lithium storage characteristic of a silicon material and high cycle stability of a carbon material at the same time, effectively inhibits volume expansion of a silicon negative electrode, and is high in specific capacity and long in cycle life.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a silicon-carbon negative electrode material for lithium-ion batteries and a lithium-ion battery. Background technique [0002] Among the existing secondary battery systems, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage, and self-discharge rate. With the continuous development of electronic technology, higher requirements are put forward for lithium-ion batteries, which require higher energy density, better cycle life, better high and low temperature charge and discharge performance and safety performance, etc., which requires lithium The cathode and anode materials for ion batteries need to be further developed and improved. [0003] In terms of negative electrode materials, due to the theoretical specific capacity of traditional com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 徐娟
Owner 阜阳申邦新材料技术有限公司
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