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Lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc. Improve stability, improve high current charge and discharge capacity, and facilitate industrial production.

Inactive Publication Date: 2014-03-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity of silicon oxide itself, this material greatly limits the application of silicon oxide hollow spheres as electrode negative materials.

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of negative electrode material: at room temperature, add 0.088g sodium dodecylbenzenesulfonate and 0.087g dodecylsulfobetaine to 10ml deionized water, and heat the solution to 40°C in a water bath environment. Stir for 1 hour; drop 55 μl of 3-aminopropyltriethoxysilane and 400 μl of tetraethyl orthosilicate into the above solution respectively, and stir for 2 hours; then heat the mixed solution to 70°C in an oil bath and keep it warm for 40 hours After the reaction, the product was collected by centrifugation, washed with ethanol and deionized water for several times, and dried; then the product was added to 50ml of concentrated hydrochloric acid (36% by mass) acetonitrile mixed solution (the volume ratio of hydrochloric acid to acetonitrile was 1: 3), stirring for 4 hours, washing with deionized water again, and drying to obtain a hollow spherical silica material. Add 0.1g of the obtained product into 10ml of pure water and stir, add 0.5g of glucose, stir f...

Embodiment 2

[0049] Preparation of negative electrode material: at room temperature, add 0.044g sodium dodecylbenzenesulfonate and 0.043g dodecyl sulfobetaine to 20ml deionized water, and heat the solution to 40°C in a water bath environment. Stir for 0.5 hours; drop 60 μl of 3-aminopropyltriethoxysilane and 600 μl of tetraethyl orthosilicate into the above solution respectively, and stir for 2 hours; then heat the mixed solution to 80°C in an oil bath and keep it warm for 20 hours After the reaction, the product was collected by centrifugation, washed with ethanol and deionized water for several times, and dried; then the product was added to 40ml of concentrated hydrochloric acid (38% by mass) acetonitrile mixed solution (the volume ratio of hydrochloric acid to acetonitrile was 1: 1), stirred for 6 hours, washed with deionized water again, and dried to obtain a silica hollow material. Add 0.2g of the obtained product into 10ml of pure water and stir, add 2g of sucrose, stir for 2 hours,...

Embodiment 3

[0051] Preparation of negative electrode material: at room temperature, add 0.017g sodium dodecylbenzenesulfonate and 0.017g dodecyl sulfobetaine to 30ml deionized water, and heat the solution to 50°C in a water bath environment. Stir for 2 hours; drop 50 μl of 3-aminopropyltriethoxysilane and 300 μl of tetraethyl orthosilicate into the above solution respectively, and stir for 0.5 hours; then heat the mixed solution to 90°C in an oil bath and keep it warm for 10 hours ; After the reaction, the product was collected by centrifugation, washed with ethanol and deionized water for several times, and dried; then the product was added to 30ml of concentrated hydrochloric acid (36% by mass) acetonitrile mixed solution (the volume ratio of hydrochloric acid to acetonitrile was 1: 2), stirring for 8 hours, washing with deionized water again, and drying to obtain a silica hollow material. Add 0.08g of the obtained product into 8ml of pure water and stir, add 1.5g of glucose, stir for 2...

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method of the lithium ion battery cathode material. In the lithium ion battery cathode material, silicon dioxide is in a spherical hollow structure, and the surface of the silicon dioxide is uniformly coated with carbon to form a carbon-silicon dioxide double-shell hollow sphere. The preparation method is characterized in that 3-aminopropyl triethoxysilane and tetraethoxysilane are adopted as silicon sources, and the hollow silicon dioxide is prepared by adopting a surface active agent soft template method; then the silicon dioxide hollow sphere is coated with organic carbon source through a pyrolysis way, and the silicon dioxide hollow sphere is carbonized at a high temperature under the inert atmosphere to obtain the lithium ion battery cathode material. The primary lithium embedding capacity of the material is 1394mAh / g, and the specific capacity can still be maintained at 498mAh / g after the material is repeatedly charged and discharged for 20 times. The preparation method is simple in process, environmentally friendly and easy for realizing the industrialized production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With the development of electric vehicles and portable electronic products, lithium-ion secondary batteries have high specific energy, high working voltage, high energy density, long cycle life, small self-discharge, no pollution, light weight, and good safety. Advantages, since it was put into the market in 1990, it has developed rapidly, and now it has occupied the mainstream of the market, and its application is becoming more and more extensive. The high-performance anode materials currently used are mainly graphite materials, which have the advantages of low price, wide sources, and good conductivity. However, since the theoretical capacity of graphite material is only 372mAh / g (LiC 6 ), and the diffusion coefficient of lithium ions in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 高濂孙壮宋雪峰张鹏
Owner SHANGHAI JIAO TONG UNIV
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