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Si-Sn composite material used for Li-ion battery anode and preparation method thereof

A lithium ion battery and composite material technology, which is applied in the field of silicon-containing fiber winding and wrapping lithium ion battery composite material and its preparation field, can solve the problems of difficult industrialized production, low production efficiency and high preparation cost, and achieves simple operation and high production cost. The effect of low and high specific capacity

Active Publication Date: 2016-03-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation of composite materials, preparation methods such as electrochemical deposition and magnetron sputtering are often used. These preparation methods have complex processes, low production efficiency, and high preparation costs, making it difficult to achieve large-scale industrial production.

Method used

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  • Si-Sn composite material used for Li-ion battery anode and preparation method thereof
  • Si-Sn composite material used for Li-ion battery anode and preparation method thereof
  • Si-Sn composite material used for Li-ion battery anode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Si prepared by high energy ball milling 50 sn 50 Filament winding and wrapping composite materials, and used as lithium-ion battery anode materials for electrochemical performance testing.

[0033] 1. For the nominal composition Si 50 sn 50 In terms of atomic percentage, the atomic percentage of silicon element is 50 at.%, and the atomic percentage of tin element is 50 at.%, which meet the composition range required in the technical scheme.

[0034] 2. Mix the selected raw material silicon powder and tin powder according to the proportion (silicon: 50 at.%, tin: 50 at. %) and put them into the ball milling tank supporting the ball milling equipment. In this embodiment, high-energy ball mills use bearing steel balls with diameters of 10 mm, 8 mm and 5 mm, and the mass ratio of balls to mixed powder is 16:1. The ball milling was carried out under an argon protective atmosphere, and the ball milling speed was 250 rpm. Si obtained after 20 h high energy ball milling 5...

Embodiment 2

[0044] Fiber-wrapped Si 20 sn 80 Composite materials, and used as lithium-ion battery anode materials for electrochemical performance testing. The difference from Example 1 is that different ratios are used in the composition ratio. The preparation method and testing process are the same as in Example 1.

[0045] The resulting silicon-containing fiber-wrapped Si prepared in this example 20 sn 80 Composite material, wherein the content of silicon element is 20at.%, the content of tin element is 80at.%, its XRD pattern is as follows Figure 8 As shown, silicon and tin exist in the form of single substances. In the silicon-containing composite material, the fiber structure content is relatively small, and the particle size is about 20-30 μm. The test results of charge-discharge cycle performance are as follows: Figure 9 As shown, the first discharge capacity is 1050mAh / g, and the capacity remains at 350mAh / g after 20 cycles.

Embodiment 3

[0047] Fiber-wrapped Si 30 sn 70 Composite materials, and used as lithium-ion battery anode materials for electrochemical performance testing. The difference from Example 1 is that different ratios are used in the composition ratio. The preparation method and testing process are the same as in Example 1.

[0048] The resulting silicon-containing fiber-wrapped Si prepared in this example 30 sn 70 Composite material, wherein the content of silicon element is 30at.%, the content of tin element is 70at.%, its XRD pattern is as follows Figure 8 As shown, silicon and tin exist in the form of single substances. In the silicon-containing composite material, the fiber structure content is relatively small, and the particle size is about 20-30 μm. The test results of charge-discharge cycle performance are as follows: Figure 9 As shown, the first discharge capacity is 1300mAh / g, and the capacity remains at 600mAh / g after 20 cycles.

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Abstract

The invention discloses a Si-Sn composite material used for a Li-ion battery anode and a preparation method thereof. The composite anode material is of a Sn-fiber-wound Si particle composite structure and composed of two elements Si and Sn, wherein the Si content is 20-70at.% and the balance is Sn. According to the preparation method of the composite anode material, Si and Sn powder are mixed and the mixed powder is ball milled by using a high-energy ball milling method in an argon atmosphere; under the action of high-energy impact, metal Sn particles deform seriously, are subjected to cold welding and torn to form Sn fibers; through further ball milling, fiber-structured ductile-phase metal Sn formed after high-energy ball milling and Si particles smashed under high-energy impact in the ball milling process are composited to form a Sn-fiber-wound Si particle composite structure. The novel Sn-fiber-wound Si composite material is simple in preparation process and low in cost; in addition, the composite material is novel and unique in structure and excellent in electrochemical performance and therefore has excellent application prospect.

Description

technical field [0001] The invention relates to the technical field of electrochemical power sources, in particular to silicon-containing composite materials used for lithium-ion batteries, and in particular to a silicon-containing fiber-wrapped lithium-ion battery composite material and a preparation method thereof. Background technique [0002] Due to its small size, light weight, high specific energy, long service life, high output voltage, low self-discharge, and environmental friendliness, lithium-ion batteries are known as the most ideal green energy in the 21st century, and have been widely used in aerospace, military, etc. , Energy storage systems in the automotive industry, electronic equipment and biomedical fields. However, currently commercial lithium-ion batteries mainly use carbon materials (such as carbon, graphite, etc.) Requirements for high capacity and high energy density of batteries. For this reason, the majority of scientific researchers have been wor...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/362H01M4/386H01M4/387H01M10/0525H01M2004/027Y02E60/10
Inventor 朱正旺吴金波张海峰王爱民付华萌张宏伟李宏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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