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Preparation method of high-energy graphene battery negative electrode material

A technology of battery negative electrode and graphene, applied in the direction of graphene, battery electrode, negative electrode, etc., can solve the problems of battery performance degradation, weak interaction force, easy de-intercalation of silicon and graphite, etc. Effect

Inactive Publication Date: 2019-12-06
长沙凯泽工程设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned various preparation methods, the interaction force between graphite and silicon is relatively weak. During the charging and discharging process of the battery, silicon and graphite are prone to deintercalation, which eventually leads to battery performance degradation. Therefore, it is necessary to develop a Anode materials that maintain long-term electrochemical performance are an urgent problem to be solved in the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Mix graphene oxide and toluene diisocyanate at a mass ratio of 1:20 and pour it into No. 1 reactor, heat and stir for 2 hours at a temperature of 70°C and a stirring speed of 300r / min, then filter to obtain No. 1 filter cake, transfer the obtained No. 1 filter cake into an oven, and dry to constant weight at a temperature of 105° C. to obtain a primary treatment graphene oxide; the primary treatment graphene oxide and sodium azide with a mass fraction of 1% The dimethylformamide solution was mixed according to the mass ratio of 1:10 and poured into the No. 2 reactor. At a temperature of 80°C and a stirring speed of 200r / min, the reaction was heated and stirred for 1 hour, and then filtered to obtain No. 2 filter. Cake, and the resulting No. 2 filter cake was dried to constant weight at a temperature of 105°C to obtain secondary treated graphene oxide; after mixing the secondary treated graphene oxide and tetrahydrofuran at a mass ratio of 1:10, the At a frequency of 40kH...

Embodiment 2

[0042] Mix graphene oxide and toluene diisocyanate at a mass ratio of 1:50 and pour them into No. 1 reactor, heat and stir for 2.5 hours at a temperature of 80°C and a stirring speed of 500 r / min, then filter to obtain 1 No. 1 filter cake, the obtained No. 1 filter cake is transferred to an oven, and dried to constant weight at a temperature of 108°C to obtain a primary treatment of graphene oxide; the primary treatment of graphene oxide and azide with a mass fraction of 5% The sodium dimethylformamide solution was mixed according to the mass ratio of 1:50 and poured into the No. 2 reactor. At a temperature of 82 ° C and a stirring speed of 500 r / min, the reaction was heated and stirred for 2 hours, and then filtered to obtain No. 2 filter cake, and the obtained No. 2 filter cake was dried to constant weight at a temperature of 108°C to obtain secondary treated graphene oxide; after the secondary treated graphene oxide and tetrahydrofuran were mixed at a mass ratio of 1:50, the...

Embodiment 3

[0048] Mix graphene oxide and toluene diisocyanate at a mass ratio of 1:100 and pour it into No. 1 reactor, heat and stir for 3 hours at a temperature of 85°C and a stirring speed of 800r / min, then filter to obtain No. 1 filter cake, transfer the obtained No. 1 filter cake into an oven, and dry it to constant weight at a temperature of 110°C to obtain a primary treatment graphene oxide; the primary treatment graphene oxide and sodium azide with a mass fraction of 10% The dimethylformamide solution was mixed according to the mass ratio of 1:100 and poured into the No. 2 reactor. At a temperature of 85°C and a stirring speed of 1000r / min, the reaction was heated and stirred for 3 hours, and then filtered to obtain No. 2 filter. Cake, and the resulting No. 2 filter cake was dried to constant weight at a temperature of 110°C to obtain secondary treated graphene oxide; after mixing the secondary treated graphene oxide and tetrahydrofuran at a mass ratio of 1:100, the ultrasonic At ...

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Abstract

The invention discloses a preparation method of a high-energy graphene battery negative electrode material, and belongs to the technical field of energy storage materials. The preparation method comprises the following steps: enabling graphene oxide to react with a dimethylformamide solution of isocyanate and sodium azide, lithium aluminum hydride and concentrated hydrochloric acid in sequence andpreparing hydrolyzed and reduced graphene oxide; equally dividing the hydrolyzed and reduced graphene oxide into two parts, enabling the two parts to respectively react with silicate ester and ferricsalt to respectively prepare concentrated acidic dispersion liquid and concentrated alkaline dispersion liquid, and mixing the two solutions to prepare a dry filter cake; performing reaction under ahigh-temperature condition, and performing cleaning with hydrofluoric acid to obtain the high-energy graphene battery negative electrode material. The obtained high-energy graphene battery negative electrode material is uses as a battery negative electrode material and has excellent cycling stability; after multiple times of charging and discharging cycling tests, the electrochemical performance and the volume expansion rate are kept at the optimal level.

Description

technical field [0001] The invention discloses a preparation method of a high-energy graphene battery negative electrode material, belonging to the technical field of energy storage materials. Background technique [0002] Graphene is a two-dimensional carbon-based material, which has attracted extensive attention from researchers because of its excellent electrical conductivity, high carrier mobility and large specific surface area. Graphene has a better lithium storage capacity than graphite, effectively solving the mass energy density limitation of graphite, because lithium ions can be stored in graphene grains, edges and different types of defect structures. In addition, graphene with high specific surface area also improves the rate capability compared to graphite due to faster interfacial kinetics. [0003] Silicon has the highest theoretical specific capacity, but the large volume expansion and low conductivity of silicon particles limit the cycle performance and rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62C01B32/184H01M10/0525
CPCC01B32/184H01M4/366H01M4/483H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 不公告发明人
Owner 长沙凯泽工程设计有限公司
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