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Preparation of silicon dioxide/titanium dioxide composite aerogel for lithium battery negative electrode material

A technology of composite aerogel and silica, used in battery electrodes, negative electrodes, electrical components, etc.

Inactive Publication Date: 2016-05-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume change effect of silica and titania during the cycle causes the attrition effect, which leads to the problem of excessive capacity decay, which is the main bottleneck limiting its application.

Method used

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  • Preparation of silicon dioxide/titanium dioxide composite aerogel for lithium battery negative electrode material
  • Preparation of silicon dioxide/titanium dioxide composite aerogel for lithium battery negative electrode material
  • Preparation of silicon dioxide/titanium dioxide composite aerogel for lithium battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Mix ethyl orthosilicate, n-butyl titanate, ethanol and aqueous solution with a magnetic stirrer at a volume ratio of 1:1:8.0:3.5, and adjust the pH value with 1mol / L hydrochloric acid to obtain a completely clear and transparent precursor The aqueous solution of ammonia is slowly added dropwise to the above-mentioned precursor solution, and the pH value is controlled to be 8.2 to obtain a silica / titania composite hydrosol; the obtained silica / titania composite hydrosol is poured into a beaker and placed in a closed desiccator for condensation Gel, after gel formation in 20 0 Aging at C for 4 days, soak the aged gel in n-hexane, replace the n-hexane 3 times within 48 hours, remove the liquid, and then dry the sample with supercritical fluid to obtain the mass ratio of silicon dioxide and titanium dioxide It is a 1:1 silica / titania composite airgel. Accurately weigh 0.3168g of silica / titania composite airgel, 0.0495g of acetylene black and Polyvinylidene fluoride 0.0464...

Embodiment 2

[0018] Mix ethyl orthosilicate, n-butyl titanate, solvent ethanol and aqueous solution with a magnetic stirrer at a volume ratio of 1:0.5:8.0:3.5, and adjust the pH value with 1mol / L hydrochloric acid to obtain a completely clear and transparent Precursor solution; slowly add ammonia solution dropwise to the above precursor solution, and control the pH value to 7-11 to obtain a silica / titania composite hydrosol; the obtained silica / titania composite hydrosol is poured into a beaker and placed in an airtight dry Gel in the container, after the gel is formed, it will take 5-30 0Aging at C temperature for 3-4 days, soak the aged gel in n-hexane, replace the n-hexane 3 times within 48 hours, remove the liquid, and then dry the sample with supercritical fluid to obtain silicon dioxide and titanium dioxide Silica / titania composite airgel with a mass ratio of 2:1. Accurately weigh 0.3168g of silica / titania composite airgel, 0.0495g of acetylene black and Polyvinylidene fluoride 0.0...

Embodiment 3

[0020] Mix tetraethyl orthosilicate, solvent ethanol, and aqueous solution under magnetic stirrer stirring at a volume ratio of 1:8.0:3.5, and adjust the pH value by 1mol / L hydrochloric acid to obtain a completely clear and transparent precursor solution; Add it dropwise to the above precursor solution, and control the pH value to 7-11 to obtain a silica hydrosol; pour the obtained silica hydrosol into a beaker and place it in a closed desiccator to gel. 0 Aging at C for 3 days, soaking the aged gel in n-hexane, replacing the n-hexane three times within 48 hours, removing the liquid, and then drying the sample with supercritical fluid to obtain silica aerogel. Take tetrabutyl titanate, ethanol and deionized water at a volume ratio of 1:10:2, mix them evenly under constant stirring, then add an appropriate amount of silica airgel to it and continue stirring, Until the airgel was completely dissolved in the mixed solution, the mixture was left to stand at room temperature for 12...

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Abstract

The invention relates to a preparation method of a silicon dioxide / titanium dioxide composite aerogel material, and also relates to application of silicon dioxide / titanium dioxide composite aerogel in a lithium battery negative electrode material. The silicon dioxide / titanium dioxide composite aerogel comprises nanoparticles of silicon dioxide and titanium dioxide and composite particles of the silicon dioxide and the titanium dioxide. The obtained silicon dioxide / titanium dioxide composite aerogel sample is low in density, stable in mechanical property and high in hydrophily. The preparation process is simple, is low in cost and is suitably used for achieving industrial production. The lithium battery negative electrode material prepared from the material has the advantages of high specific capacity and stable cycle performance. The composite aerogel has high porosity and favorable mechanical property, the volume change of an electrode material during the cyclic process is reduced, the problem of particle aggregation during the cyclic process is solved, thus, the electrochemical cycle stability is improved, and the composite aerogel is the lithium battery negative electrode which has wide application prospect.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemical technology, and relates to a preparation method of silicon dioxide / titania composite airgel; and the use of silicon dioxide / titania composite airgel, that is, as a A new negative electrode material. Background technique [0002] Energy is an important material basis for human survival and development, the driving force behind various economic activities, and an important indicator of the level of social and economic development. Due to its high capacity, high energy density, low cost, long cycle life, and high operating voltage, lithium-ion batteries have become one of the most potential energy storage systems today and have been widely used. The performance of electrode materials directly determines the performance of lithium-ion batteries, so it is of great significance to seek high-performance electrode materials. [0003] Airgel is a lightweight porous nanostructure ma...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/483H01M10/0525H01M2004/021H01M2004/023H01M2004/027Y02E60/10
Inventor 不公告发明人
Owner XIANGTAN UNIV
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