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Lithium ion battery negative electrode slurry based on graphene-silicon dioxide composite aerogel and preparation method of lithium ion battery negative electrode slurry

A composite airgel and lithium-ion battery technology, which is applied to battery electrodes, secondary batteries, negative electrodes, etc., can solve problems such as poor stability and abnormal coating of lithium-ion battery negative electrode slurry, and achieve improved fluidity and easy Effect of coating and improving stability

Active Publication Date: 2020-09-18
JIANGSU RIYU PHOTOVOTTAIC NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a lithium-ion battery negative electrode slurry based on graphene-silicon dioxide composite airgel and its preparation method, so as to solve technical problems such as abnormal coating and poor stability of lithium-ion battery negative electrode slurry

Method used

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  • Lithium ion battery negative electrode slurry based on graphene-silicon dioxide composite aerogel and preparation method of lithium ion battery negative electrode slurry
  • Lithium ion battery negative electrode slurry based on graphene-silicon dioxide composite aerogel and preparation method of lithium ion battery negative electrode slurry

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Embodiment 1

[0032] A kind of preparation method of the negative electrode slurry of lithium ion battery based on graphene-silicon dioxide composite airgel, concrete steps are as follows:

[0033] (1) Using graphite oxide and 4-methyl-5-glycolic acid-3-allylthiazole bromide as raw materials, obtain nitrogen-sulfur-bromine co-doped graphene oxide through hydrothermal reaction;

[0034] (2) Then nitrogen, sulfur and bromine co-doped graphene oxide is added to ethyl orthosilicate, fully stirred, and 40% mass concentration of ethanol aqueous solution is added, mixed evenly to obtain a suspension;

[0035] (3) Then adjust pH=4, stand for hydrolysis, adjust pH=8, heat to 70° C., stand for aging to obtain a hydrogel, post-process, and reduce to obtain a graphene-silicon dioxide composite airgel;

[0036] (4) Finally, the graphene-silica composite airgel is mixed and ground with thickener, adhesive, dispersant, conductive agent, polyvinylidene chloride, sodium polystyrene sulfonate, and water to o...

Embodiment 2

[0051] A kind of preparation method of the negative electrode slurry of lithium ion battery based on graphene-silicon dioxide composite airgel, concrete steps are as follows:

[0052] (1) Using graphite oxide and 4-methyl-5-glycolic acid-3-allylthiazole bromide as raw materials, obtain nitrogen-sulfur-bromine co-doped graphene oxide through hydrothermal reaction;

[0053] (2) Then add nitrogen, sulfur and bromine co-doped graphene oxide into tetraethyl orthosilicate, stir fully, add a 50% ethanol aqueous solution with a mass concentration, and mix evenly to obtain a suspension;

[0054] (3) Then adjust the pH=3, stand for hydrolysis, adjust the pH=10, heat to 60° C., stand and mature to obtain a hydrogel, post-process, and reduce to obtain a graphene-silicon dioxide composite airgel;

[0055] (4) Finally, the graphene-silica composite airgel is mixed and ground with thickener, adhesive, dispersant, conductive agent, polyvinylidene chloride, sodium polystyrene sulfonate, and wa...

Embodiment 3

[0070] A kind of preparation method of the negative electrode slurry of lithium ion battery based on graphene-silicon dioxide composite airgel, concrete steps are as follows:

[0071] (1) Using graphite oxide and 4-methyl-5-glycolic acid-3-allylthiazole bromide as raw materials, obtain nitrogen-sulfur-bromine co-doped graphene oxide through hydrothermal reaction;

[0072] (2) Then nitrogen, sulfur and bromine co-doped graphene oxide was added to ethyl orthosilicate, fully stirred, and 45% ethanol aqueous solution was added, and mixed evenly to obtain a suspension;

[0073] (3) Then adjust pH=3.5, stand for hydrolysis, adjust pH=9, heat to 65° C., stand for aging to obtain a hydrogel, post-process, and reduce to obtain a graphene-silicon dioxide composite airgel;

[0074] (4) Finally, the graphene-silica composite airgel is mixed and ground with thickener, adhesive, dispersant, conductive agent, polyvinylidene chloride, sodium polystyrene sulfonate, and water to obtain the desc...

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Abstract

The invention provides lithium ion battery negative electrode slurry based on graphene-silicon dioxide composite aerogel and a preparation method of the lithium ion battery negative electrode slurry.The preparation method comprises the steps of firstly, taking graphite oxide and 4-methyl-5-glycolic acid-3-allyl thiazole bromide as raw materials; carrying out hydrothermal reaction to obtain nitrogen, sulfur and bromine co-doped graphene oxide; then mixing, hydrolyzing and curing the nitrogen-sulfur-bromine co-doped graphene oxide and tetraethoxysilane to obtain hydrogel; carrying out post-treatment and reduction to obtain graphene-silicon dioxide composite aerogel; and finally, mixing and grinding the graphene-silicon dioxide composite aerogel, a thickening agent, an adhesive, a dispersingagent, a conductive agent, polyvinylidene chloride, sodium polystyrenesulfonate and water to obtain the lithium ion battery negative electrode slurry based on the graphene-silicon dioxide composite aerogel. The coating performance and the stability are obviously improved, the conditions of caking, sedimentation and the like are avoided, and the battery performance is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a graphene-silicon dioxide composite airgel-based lithium ion battery negative electrode slurry and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, small size, light weight, high energy density, good cycle performance, and no memory effect. Lithium-ion batteries are widely used in portable mobile appliances such as mobile phones and notebook computers. In addition, they are used in electric bicycles It also has broad application prospects in electric vehicles. [0003] Lithium-ion batteries are composed of positive electrodes, negative electrodes, separators, and battery cases, among which, the positive electrodes and the negative electrodes are formed by coating their respective slurry on the surface of the corresponding current collector through drying and rolling processes. Wherein, the tradi...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/587H01M4/62H01M4/622H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 唐荣林
Owner JIANGSU RIYU PHOTOVOTTAIC NEW MATERIAL TECH CO LTD
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