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A method for preparing a lithium metal electrode

A lithium metal electrode and non-polar solvent technology, applied in the field of lithium metal electrode preparation, can solve problems such as battery short circuit, achieve good conductivity, avoid excessive local current, good cycle performance and safety performance

Active Publication Date: 2019-01-15
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with other negative electrodes, lithium metal electrodes are more likely to lead to the formation of lithium dendrites, and lithium dendrites can easily pierce the separator paper and cause internal short circuits in the battery, resulting in safety issues

Method used

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  • A method for preparing a lithium metal electrode
  • A method for preparing a lithium metal electrode
  • A method for preparing a lithium metal electrode

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preparation example Construction

[0038] figure 1 It is a schematic flow diagram of a preparation method of a lithium metal electrode according to an embodiment of the present invention, see figure 1 , the method includes:

[0039] S1: mixing carbon nanotubes with nitric acid solution to obtain the first product;

[0040] S2: subjecting the obtained first product to high-temperature condensation and reflux treatment to obtain a second product;

[0041] S3: centrifuging the obtained second product to obtain a third product;

[0042] S4: After washing the obtained third product, vacuum drying is obtained to obtain a fourth product;

[0043] S5: ultrasonically dispersing the obtained fourth product into a low-boiling non-polar solvent to form a dispersion;

[0044] S6: adding the formed dispersion liquid onto the lithium metal electrode dropwise;

[0045] S7: After the dispersion liquid is naturally and evenly spread on the lithium metal electrode, the lithium metal electrode with the dispersion liquid is ev...

Embodiment 1

[0064] (1) 0.5 gram of multi-walled carbon nanotubes is mixed with 150 milliliters of 3M nitric acid solution to obtain the first product;

[0065] (2) subjecting the first product to reflux at 150° C. for 4 hours to obtain the second product;

[0066] (3) centrifuging the second product to obtain a third product;

[0067] (4) washing the third product with deionized water and ethanol five times, and drying in vacuum at 80° C. to obtain the fourth product, i.e. acidified carbon nanotubes after drying;

[0068] (5) ultrasonically disperse the fourth product in tetrahydrofuran at 1 mg / mL to form a dispersion;

[0069] (4) The dispersion liquid is directly dropped onto the lithium metal electrode in an amount of 60 microliters per square centimeter, the dispersion liquid is naturally and evenly spread, and the solvent is evaporated to dryness at 40° C. to obtain a lithium metal electrode 1 with a modified layer on the surface. .

Embodiment 2

[0071] (1) 0.5 gram of multi-walled carbon nanotubes is mixed with 150 milliliters of 3M nitric acid solution to form the first product;

[0072] (2) subjecting the first product to reflux at 150° C. for 4 hours to obtain the second product;

[0073] (3) centrifuging the second product to obtain a third product;

[0074] (4) washing the third product with deionized water and ethanol five times, and vacuum-drying at 80°C to obtain the fourth product, i.e. acidified carbon nanotubes after drying;

[0075] (5) ultrasonically disperse the fourth product in tetrahydrofuran at 2 mg / mL to form a dispersion;

[0076] (6) The dispersion liquid is directly dropped onto the lithium metal electrode in an amount of 60 microliters per square centimeter, the dispersion liquid is naturally and evenly spread, and the solvent is evaporated to dryness at 40°C to obtain a lithium metal electrode 2 with a modified layer on the surface. .

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Abstract

The invention relates to a preparation method of a lithium metal electrode. The method comprises the following steps of: mixing carbon nanotubes and nitric acid solution to obtain a first product; Subjecting the obtained first product to high-temperature condensation reflux treatment to obtain a second product; Subjecting the obtained second product to a centrifugation operation to obtain a thirdproduct; Washing the obtained third product and vacuum drying to obtain a fourth product; Ultrasonically dispersing the obtained fourth product into a non-polar solvent having a low boiling point to form a dispersion; Adding the formed dispersion liquid droplets to a lithium metal electrode; After the dispersion is naturally and uniformly spread on the lithium metal electrode, the lithium metal electrode with the dispersion is evaporated and dried, that is, a modification layer with a network structure is formed on the surface of the lithium metal electrode. The lithium metal electrode prepared by the method of the invention has better cycle performance and safety performance, and can greatly inhibit the growth of lithium dendrite.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a preparation method of a lithium metal electrode. Background technique [0002] The lithium metal electrode has the highest theoretical capacity (3860mAhg –1 , or 2061mAh cm –3 ) and the lowest electrochemical potential (-3.04V), it is an excellent choice for anode materials in lithium batteries. In addition, lithium metal electrodes are the best choice in lithium-sulfur and lithium-air battery systems. In order to meet the challenges of future demand for energy storage devices, it is crucial to modify or modify lithium metal electrodes. [0003] In the process of realizing the present invention, the applicant finds that there are at least the following problems in the prior art: [0004] At this stage, lithium metal electrodes are also facing many severe challenges, the most important of which are safety issues and cycle issues. Compared with other negative electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395
CPCH01M4/1395Y02E60/10
Inventor 刘钰旻夏宇江云
Owner JIANGHAN UNIVERSITY
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