Silicon-based negative electrode material for lithium ion battery and preparation method of silicon-based negative electrode material

A silicon-based negative electrode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of unsuitability for large-scale production, complex process routes and high cost, Achieve the effect of easy industrialization, good cycle stability and low production cost

Inactive Publication Date: 2019-03-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are disadvantages such as high cost, high energy consumption, complex process route, and not suitable for large-scale production. Therefore, it is necessary to de

Method used

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  • Silicon-based negative electrode material for lithium ion battery and preparation method of silicon-based negative electrode material
  • Silicon-based negative electrode material for lithium ion battery and preparation method of silicon-based negative electrode material
  • Silicon-based negative electrode material for lithium ion battery and preparation method of silicon-based negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh pure silicon with a particle size of 1 μm and pure silicon dioxide with a particle size of 1 μm and place them in a ball mill jar so that the molar ratio is 1:1. Add grinding balls so that the mass ratio of grinding balls to the total mass of silicon and silicon dioxide is 20:1. Seal the ball mill jar under argon atmosphere, and ball mill at 800r / min for 36h to obtain Si / SiO 2 composite material.

[0032] The above materials at 0.5A g -1 Under the current density, the first charge capacity is 836mAh g -1 , the capacity can be maintained at 1200mAh g after 200 cycles -1 .

Embodiment 2

[0034] Pure silicon with a particle size of 0.5 μm and pure silicon dioxide with a particle size of 20 μm were weighed and placed in a ball mill jar so that the molar ratio was 1:10. Add grinding balls so that the mass ratio of grinding balls to the total mass of silicon and silicon dioxide is 5:1. Seal the ball mill jar under argon atmosphere, and ball mill it at 1000r / min for 60h to obtain Si / SiO 2 composite material.

[0035] The above-mentioned negative electrode materials are at 0.5A g -1 Under the current density, the first charge capacity is 783mAh g -1 , the capacity can be maintained at 750mAh g after 200 cycles -1 .

Embodiment 3

[0037] Weigh pure silicon with a particle size of 100 μm and pure silicon dioxide with a particle size of 0.5 μm and place them in a ball mill jar so that the molar ratio is 1:0.1. Add grinding balls so that the mass ratio of grinding balls to the total mass of silicon and silicon dioxide is 30:1. Seal the ball mill jar under argon atmosphere, and ball mill it at 400r / min for 1h to obtain Si / SiO 2 composite material.

[0038] The above-mentioned negative electrode materials are at 0.5A g -1 Under the current density, the first charge capacity is 2815mAh g -1 , the capacity can be maintained at 1940mAh g after 200 cycles -1 .

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Abstract

The invention relates to a silicon-based negative electrode material for a lithium ion battery and a preparation method of the silicon-based negative electrode material and belongs to the field of lithium ion battery negative electrode materials. The silicon-based negative electrode material is prepared by taking silicon and silica as raw materials by a ball-milling method, and is a composite material formed by mutually contacting the silicon and silica particles and uniformly distributing the particles in a three-dimensional space on a micro scale, wherein the particle size of the two kinds of particles is 50-300nm. In the ball milling process, the particle size is obviously reduced when the two raw materials are uniformly mixed, and compared with a bulk material, the material disclosed by the invention is capable of effectively releasing stress produced by lithium insertion. Meanwhile, the electrochemical activity of the silica in the grinding process is improved. The capacity of thenegative electrode material is maintained at 800-2000mAhg<-1> under the current density of 0.5Ag<-1> after 200 cycles. The composite material fully achieves the characteristics of high specific capacity of the silicon material and excellent cycling stability of the silica, the respective advantages of the two materials are complemented, and volume expansion of the silicon-based material in the charging and discharging process is buffered by an irreversible phase produced in the lithium insertion process by utilizing the silica material.

Description

technical field [0001] The invention relates to a silicon-based negative electrode material for a lithium ion battery, belonging to the field of lithium ion battery negative electrode materials. Background technique [0002] Since the commercialization of lithium-ion batteries, lithium-ion batteries have rapidly occupied the portable electronic device market due to their advantages such as high energy density, stable cycle, convenience and lightness; currently, the anode material of commercialized lithium-ion batteries is mainly graphite, and its theoretical specific capacity is 372mAh g -1 , far from meeting people's needs for high-energy-density batteries, there is an urgent need to develop new high-capacity and low-voltage negative electrode materials. [0003] The theoretical capacity of silicon is as high as 4200mAh g -1 , and its low intercalation potential and abundant reserves, it is an ideal substitute for the anode material of the next generation of lithium-ion b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/386H01M4/485H01M10/0525Y02E60/10
Inventor 吴昊王连邦郑丽华
Owner ZHEJIANG UNIV OF TECH
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