Silicon-based and tin-based composite particles for lithium ion battery and preparation method thereof and negative electrode and lithium ion battery containing silicon-based and tin-based composite particles

一种锂离子电池、复合颗粒的技术，应用在电池电极、二次电池、用于材料和表面科学的纳米技术等方向，能够解决电极结构不稳定、循环性能差、体积膨胀等问题，达到制备方法简单、比容量高、阻止团聚的效果

Active Publication Date: 2018-11-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of volume expansion, tin agglomeration, unstable electrode structure and poor cycle performance of existing silicon-based and tin-based composite materials, the present disclosure provides a high-performance silicon-tin composite lithium-ion battery negative electrode material

Method used

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  • Silicon-based and tin-based composite particles for lithium ion battery and preparation method thereof and negative electrode and lithium ion battery containing silicon-based and tin-based composite particles
  • Silicon-based and tin-based composite particles for lithium ion battery and preparation method thereof and negative electrode and lithium ion battery containing silicon-based and tin-based composite particles
  • Silicon-based and tin-based composite particles for lithium ion battery and preparation method thereof and negative electrode and lithium ion battery containing silicon-based and tin-based composite particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Mix 60ml of deionized water, 150ml of ethanol and 15ml of 25% ammonia water in a beaker, add 10ml of tetraethyl orthosilicate and stir at room temperature for 50min. Centrifuge and wash with deionized water to obtain a silica template with a particle size of 130 nm.

[0064] (2) Add 1 g of the product in step (1) to 100 ml of deionized water, and ultrasonically disperse for 30 min. Add 50ml of 1mol / L sodium stannate solution, stir and react at 70°C for 2h. Centrifuge and wash with deionized water to obtain the product.

[0065] (3) Prepare a 1.5 mol / L potassium hydroxide solution, add the product in step (2), stir and react at 75 degrees for 1 h. Centrifuge and wash with deionized water to obtain tin dioxide hollow spheres with a particle size of 150 nm.

[0066] (4) Put 0.5 g of the product of step (3) into a tube furnace, and react at 450 degrees for 2 hours at a flow rate of 100 sccm by silane gas cracking under the protection of argon. Silicon / tin dioxide ho...

Embodiment 2

[0069] (1) With ethylene glycol methyl ether as the solvent, configure 100ml of 2mol / L ferric nitrate solution. Stir and add 10ml of sodium dodecylsulfonate, butyl titanate and ethyl silicate respectively at 70°C. After forming a uniform and stable brown sol, the sol was aged at 70°C for 2h, and dried under reduced pressure at 90°C for 3h. The product was taken out and calcined in a muffle furnace at 600°C for 3 hours to obtain nano-block particles of ferric oxide with a particle size of 50 nm.

[0070] (2) Add 2 g of the product in step (1) into 100 ml of deionized water, and ultrasonically disperse for 30 min. Add 30ml of 1mol / L potassium stannate solution, stir and react at 60°C for 2h. Centrifuge and wash with deionized water to obtain the product.

[0071] (3) Prepare 1 mol / L potassium hydroxide solution, add the product in step (2), stir and react at 80 degrees for 2 hours. Centrifuge and wash with deionized water to obtain tin dioxide hollow particles with a particl...

Embodiment 3

[0075](1) With ethylene glycol methyl ether as the solvent, configure 100ml of 2mol / L zinc nitrate solution. Stir and add 20ml of sodium dodecylsulfonate, butyl titanate and ethyl silicate respectively at 80°C. After forming a uniform and stable brown sol, the sol was aged at 80°C for 2h, and dried under reduced pressure at 90°C for 3h. The product was taken out and calcined in a muffle furnace at 600°C for 3 hours to obtain nano-spherical particles of zinc oxide with a particle size of 100 nm.

[0076] (2) Add 3 g of the product in step (1) into 100 ml of deionized water, and ultrasonically disperse for 30 min. Add 40ml of 1mol / L sodium stannate solution, stir and react at 60°C for 0.5h. Centrifuge and wash with deionized water to obtain the product.

[0077] (3) Prepare a 2mol / L potassium hydroxide solution, add the product in step (2), stir and react at 80°C for 2h. Centrifuge and wash with deionized water to obtain stannous oxide hollow spheres with a particle size of ...

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Abstract

The invention provides silicon-based and tin-based composite particles for a lithium ion battery and a preparation method thereof and negative electrode and a lithium ion battery containing the silicon-based and tin-based composite particles. The silicon-based and tin-based composite particles are characterized by being prepared from hollow tin particles or hollow tin oxide particles and a siliconlayer coating the outer surfaces of the hollow tin particles or hollow tin oxide particles. The invention also provides the negative electrode containing the composite particles and applied to a lithium ion secondary battery, and the lithium ion secondary battery with the negative electrode. The preparation method of the composite particles is simple; due to the hollow structure, the particles can effectively accommodate the volume expansion of silicon-based and tin-based materials in a lithium intercalation process, so as to maintain stability of the electrode structure. Moreover, an external silicon-based material can effectively prevent agglomeration of nano tin particles and maintain stability of a tin-based material, so as to obtain a lithium ion battery negative electrode compositematerial with great specific capacity and good cycle performance.

Description

[0001] This application is an invention patent application with the application number 2016110373036, the application date is November 23, 2016, and the invention name is "Si-based tin-based composite particles for lithium-ion batteries, its preparation method, negative electrode and lithium-ion batteries containing them" divisional application. technical field [0002] The disclosure relates to a silicon-based tin-based composite particle for a lithium ion battery, its preparation method, a negative electrode containing the material and a lithium ion battery, specifically, the disclosure relates to a hollow composite particle for a lithium ion battery, its preparation method , a negative electrode and a lithium-ion battery comprising the composite particles. Background technique [0003] The working principle of lithium-ion batteries is that lithium is transferred between the positive and negative electrodes of the battery in the form of ions, so that the battery can comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/387H01M4/483H01M10/0525Y02E60/10
Inventor 邱新平马天翼余向南
Owner TSINGHUA UNIV
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