Polymer-coating silicon/lithium metasilicate cathode material and preparation method thereof

A lithium metasilicate and negative electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of no very effective method and poor cycle stability of micron-scale silicon-based negative electrode, and achieve high specific capacity and easy operation. and industrial production, the effect of simple preparation method

Active Publication Date: 2018-07-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, it is still in the initial stage of research to solve the problem of poor

Method used

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  • Polymer-coating silicon/lithium metasilicate cathode material and preparation method thereof
  • Polymer-coating silicon/lithium metasilicate cathode material and preparation method thereof
  • Polymer-coating silicon/lithium metasilicate cathode material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0025] Example 1

[0026] The polymer-coated silicon / lithium metasilicate negative electrode material proposed in this embodiment is composed of a silicon / lithium metasilicate composite material (Si / Li 2 SiO 3 ) And a polypyrrole coating layer (P) coated on the silicon / lithium metasilicate composite material, wherein the weight percentage of the silicon / lithium metasilicate composite material is 95%, and the polypyrrole coating layer The weight percentage is 5%, and its composition is [Si / Li 2 SiO 3 ] 0.95 / P 0.05 ;

[0027] The method for preparing the polymer-coated silicon / lithium metasilicate negative electrode material proposed in this embodiment includes the following steps:

[0028] S1. Preparation of silicon / lithium metasilicate composite material Si / Li 2 SiO 3 : Mix 5.0g of silicon oxide and 0.5g of lithium metal powder in an argon atmosphere by mechanical ball milling for 1 hour to obtain a silicon / lithium metasilicate composite material Si / Li 2 SiO 3 ;

[0029] S2. Preparat...

Example Embodiment

[0033] Example 2

[0034] The polymer-coated silicon / lithium metasilicate negative electrode material proposed in this embodiment is composed of a silicon / lithium metasilicate composite material (Si / Li 2 SiO 3 ) And a polyaniline coating layer (P) coated on the silicon / lithium metasilicate composite material, wherein the weight percentage of the silicon / lithium metasilicate composite material is 95%, and the polyaniline coating layer The weight percentage is 5%, and its composition is [Si / Li 2 SiO 3 ] 0.95 / P 0.05 ;

[0035] The method for preparing the polymer-coated silicon / lithium metasilicate negative electrode material proposed in this embodiment includes the following steps:

[0036] S1. Preparation of silicon / lithium metasilicate composite material Si / Li 2 SiO 3 : Mix 5.0g of silicon oxide and 0.5g of lithium metal powder in an argon atmosphere by mechanical ball milling for 1 hour to obtain a silicon / lithium metasilicate composite material Si / Li 2 SiO 3 ;

[0037] S2. Preparat...

Example Embodiment

[0039] Example 3

[0040] The polymer-coated silicon / lithium metasilicate negative electrode material proposed in this embodiment is composed of a silicon / lithium metasilicate composite material (Si / Li 2 SiO 3 ) And a polypyrrole coating layer (P) coated on the silicon / lithium metasilicate composite material, wherein the weight percentage of the silicon / lithium metasilicate composite material is 98%, and the polypyrrole coating layer The weight percentage is 2%, and its composition is [Si / Li 2 SiO 3 ] 0.98 / P 0.02 ;

[0041] The method for preparing the polymer-coated silicon / lithium metasilicate negative electrode material proposed in this embodiment includes the following steps:

[0042] S1. Preparation of silicon / lithium metasilicate composite material Si / Li 2 SiO 3 : Mix 5.0g of silicon oxide and 0.5g of lithium metal powder in an argon atmosphere by mechanical ball milling for 0.5h to obtain a silicon / lithium metasilicate composite material Si / Li 2 SiO 3 ;

[0043] S2. Preparatio...

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Abstract

The invention discloses a polymer-coating silicon/lithium metasilicate cathode material, which is prepared from a silicon/lithium metasilicate composite material and a polymer coating layer coating the outside of the silicon/lithium metasilicate composite material; and the polymer coating layer is a coating layer formed by one of polypyrrole, polyaniline, polydopamine and polyacrylonitrile. The invention further provides a preparation method of the polymer-coating silicon/lithium metasilicate cathode material. The preparation method comprises the following steps: preparing the silicon/lithiummetasilicate composite material and preparing the polymer coating layer. The process of the preparation method is simple and feasible, and is convenient for large-scale production; the polymer-coatingsilicon/lithium metasilicate cathode material is high in practicalization degree; the obtained material is high in reversible capacity and high in cycle performance, and has a wide application prospect in the aspect of lithium ion battery cathodes.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a polymer-coated silicon / lithium metasilicate negative electrode material and a preparation method thereof. Background technique [0002] Silicon-based materials have extremely high specific capacity, for example, the theoretical specific capacity of Si is 4200mAh / g, and SiO is 2000mAh / g, which is an ideal negative electrode material for high specific energy batteries. However, the volume expansion of silicon-based materials can be as high as 300% during the charging and discharging process, which will generate huge stress and cause the particle breakage of silicon-based materials, which will cause material pulverization and eventually lead to a decrease in the cycle stability of the material. In order to solve this problem, the academic circles adopt nano-silicon materials and construct composites, and the industry adopts the method of compounding with mate...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 郭桂略王辉齐美洲
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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