Method for protecting lithium metal negative electrode, lithium metal negative electrode and lithium battery

A lithium metal negative electrode, lithium battery technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of unstable SEI film, pulverization, loss, etc., to improve safety performance and prevent lithium dendrites. produced effect

Active Publication Date: 2018-08-03
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, compared with the traditional graphite negative electrode, the lithium metal negative electrode also has obvious disadvantages. For example, the lithium metal negative electrode has a very high reactivity, and it will react wit...

Method used

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  • Method for protecting lithium metal negative electrode, lithium metal negative electrode and lithium battery
  • Method for protecting lithium metal negative electrode, lithium metal negative electrode and lithium battery
  • Method for protecting lithium metal negative electrode, lithium metal negative electrode and lithium battery

Examples

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Embodiment 1

[0036] The anionic polymer in this embodiment is commercially available sodium polyacrylate, and the boron nitride is commercially available flaky hexagonal boron nitride powder with a diameter of 0.3 to 1 micron and a thickness of 20 to 110 nanometers;

[0037] Mix 25 parts by mass of sodium polyacrylate with 75 parts by mass of hexagonal boron nitride powder and disperse them in tetrahydrofuran to obtain a dispersion with a solid content of 1%;

[0038] Coat the dispersion on the surface of the lithium strip in a drying room (dew point below -35°C) using a micro-gravure. The width of the lithium strip is 30 cm and the thickness is 75 microns, double-sided coating, air-dried to remove the solvent, and the coating is obtained A lithium metal negative electrode with a protective coating, the thickness of the coating is 0.2 microns.

Embodiment 2

[0040] The anionic polymer of the present embodiment is self-made Li-Nafion, and boron nitride is a self-made boron nitride nanosheet;

[0041] Mix 90 parts by mass of Li-Nafion with 10 parts by mass of boron nitride nanosheets, and disperse them in dimethylformamide to obtain a dispersion with a solid content of 6%;

[0042]Scrape-coat the dispersion on the surface of the lithium strip in a glove box (oxygen content <1ppm, water content <1ppm). The width of the lithium strip is 10 cm, the thickness is 100 microns, one-sided coating, and vacuum drying at 60°C for 48 hours to remove the solvent , to obtain a lithium metal negative electrode coated with a protective coating, the thickness of the coating is 1.8 microns.

[0043] The preparation method of Li-Nafion in this example is as follows: put the commercially available Nafion membrane into an aqueous lithium oxalate solution (0.1M), treat it in a water bath at 40°C for 24h, then wash it with deionized water, and dry it in v...

Embodiment 3

[0046] The anionic polymer of the present embodiment is self-made Li-Nafion, and boron nitride is a self-made boron nitride nanosheet;

[0047] Mix 75 parts by mass of Li-Nafion with 25 parts by mass of boron nitride nanosheets, and disperse them in dimethylformamide to obtain a dispersion with a solid content of 3%;

[0048] The dispersion is applied to the surface of the lithium strip by spraying in a drying room (dew point below -35°C). The lithium strip has a width of 10 cm and a thickness of 100 microns. It is coated on both sides and air-dried to obtain a coated The lithium metal negative electrode of the protective coating, the thickness of the coating is 1 micron.

[0049] The preparation method of the Li-Nafion of the present embodiment is as follows: put the commercially available Nafion membrane into a lithium bistrifluoromethanesulfonyl imide solution (0.5M), the solvent is ethylene glycol dimethyl ether, and stand at room temperature for 24h, Then the treated Naf...

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Abstract

The invention provides a method for protecting a lithium metal negative electrode, the lithium metal negative electrode and a lithium battery. A protective layer is formed on the surface of the lithium metal negative electrode, an anionic polymer and boron nitride are dispersed in an organic solvent, and a dispersion solution is prepared; the surface of the lithium metal negative electrode is coated with the dispersion solution; the protective layer is formed on the surface of the lithium metal negative electrode after drying. Selective conduction of lithium ions can be achieved by the composite protective layer, the lithium ions can be uniformly deposited on the surface of the lithium metal negative electrode, lithium dendrites are prevented from penetrating out, and the stable lithium metal negative electrode is obtained and can improve cycle performance and safety performance of the lithium battery after being applied to the lithium battery, and high energy density is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a method for protecting a lithium metal negative electrode, a lithium metal negative electrode and a lithium battery. Background technique [0002] With the continuous consumption of fossil energy and the aggravation of environmental pollution, the development and effective utilization of new renewable energy has become an important issue for human beings. In recent years, pure electric vehicles, hybrid vehicles, and unmanned aerial vehicles have entered a stage of rapid development and popularization. Research and development of corresponding high-safety energy storage devices that can be matched has become one of the technical problems that need to be overcome urgently. Solar energy and wind energy, as renewable clean energy to replace traditional energy such as coal, oil, and natural gas, have been gradually applied in various fields. However, due to the...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/134H01M4/62H01M10/052H01M12/08
CPCH01M4/134H01M4/1395H01M4/628H01M10/052H01M12/08Y02E60/10
Inventor 潘跃德徐延铭李俊义李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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