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A negative electrode slurry for lithium-ion batteries based on graphene-silicon dioxide composite airgel and preparation method thereof

A composite airgel and lithium-ion battery technology, applied in battery electrodes, secondary batteries, negative electrodes, etc., can solve the problems of abnormal slurry coating and poor stability of lithium-ion battery negative electrodes, to ensure battery performance and improve Effect of Coating Performance and Stability

Active Publication Date: 2021-11-05
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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  • A negative electrode slurry for lithium-ion batteries based on graphene-silicon dioxide composite airgel and preparation method thereof
  • A negative electrode slurry for lithium-ion batteries based on graphene-silicon dioxide composite airgel and preparation method thereof

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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 a lithium ion battery negative electrode slurry based on graphene-silicon dioxide composite airgel and a preparation method thereof. First, graphite oxide and 4-methyl-5-glycolic acid-3-allylthiazole are used Bromine salt is used as the raw material, and the nitrogen, sulfur, and bromine co-doped graphene oxide is obtained through hydrothermal reaction, and then the nitrogen, sulfur, and bromine co-doped graphene oxide is mixed with ethyl orthosilicate for hydrolysis and aging to obtain a hydrogel, and then post-treated and reduction to obtain graphene-silica composite airgel, and finally graphene-silica composite airgel with thickener, adhesive, dispersant, conductive agent, polyvinylidene chloride, polystyrene sulfonate NaCl and water were mixed and ground to obtain a negative electrode slurry for lithium-ion batteries based on graphene-silica composite airgel, which significantly improved the coating performance and stability, and did not cause agglomeration or sedimentation, ensuring that the battery performance.

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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Patent Type & Authority Patents(China)
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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