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Lithium metal anode protective layer and preparation method and application thereof

A lithium metal negative electrode and metal protective layer technology, which is applied in the field of solid-state batteries, can solve the problems of affecting the battery cycle rate performance, reducing the battery cycle life, and increasing the battery impedance, so as to improve the cycle performance, prevent the generation of lithium dendrites, Effect of Reducing Interface Impedance

Active Publication Date: 2020-07-21
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the high reactivity of lithium metal, the phenomenon of instability with the solid electrolyte has always existed. The reaction between lithium metal and the solid electrolyte will increase the internal impedance of the battery and affect the rate performance of the battery cycle; A lot of gaps are easily pierced by lithium dendrites during the cycle, resulting in a micro-short circuit in the battery and reducing the cycle life of the battery

Method used

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  • Lithium metal anode protective layer and preparation method and application thereof
  • Lithium metal anode protective layer and preparation method and application thereof
  • Lithium metal anode protective layer and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Under the environment of the drying room (dew point-40 ℃), a 10cm×10cm lithium foil is fixed on the evaporation mask and placed on the substrate plate of the evaporation chamber, and 0.4g metallic silver is placed on the evaporation boat (the material is Molybdenum, can also be tungsten or tantalum, etc.) fixed on the evaporation source, until the vacuum degree of the chamber reaches 10 -3 ~10 -5 After Pa, raise the substrate temperature to 80-150°C and start metal evaporation, gradually increase the evaporation arc current until the evaporation rate is stable at 0.01nm / s, continue to evaporate silver on the lithium metal surface at this speed, Stop the evaporation when the thickness of the evaporation layer reaches 100nm, and take it out after the lithium foil is cooled to room temperature to obtain a lithium metal negative electrode with a Li-Ag alloy protective layer.

[0077] Dissolve PEO and LiTFSI into anhydrous acetonitrile at a mass ratio of 3:1, and coat the f...

Embodiment 2

[0087] Under the environment of the dry room (dew point -40°C), a lithium foil with a diameter of 4 cm was placed on the sample stage as a substrate, and a silver foil with a diameter of 0.8 cm was placed at the sputtering head. -3 ~10 -5Sputtering is carried out under the vacuum degree of Pa, and the sputtering time is set to be 1 hour. After the sputtering is completed, the thickness of the metal coating is 500 nm, and finally a lithium metal negative electrode with a Li-Ag alloy protective layer is obtained.

[0088] Dissolve PEO and LiTFSI into anhydrous acetonitrile at a mass ratio of 3:1, and coat the film on a coating machine with a scraper gap of 400um. After the film is formed, the solvent is dried and then transferred to a vacuum drying oven for drying at 60°C. Dry for 24 hours to obtain a polymer protective layer with a thickness of 5 μm.

[0089] The above-mentioned metal protective layer of the lithium metal negative electrode with the Li-Ag alloy protective laye...

Embodiment 3

[0091] Under the environment of the dry room (dew point -40°C), a lithium foil with a diameter of 4 cm was placed on the sample stage as a substrate, and a silver foil with a diameter of 0.8 cm was placed at the sputtering head. -3 ~10 -5 Sputtering is carried out under the vacuum degree of Pa, and the thickness of the metal coating is 5 nm after the sputtering is completed, and finally a lithium metal negative electrode with a Li-Ag alloy protective layer is obtained.

[0092] Dissolve PEO and LiTFSI into anhydrous acetonitrile at a mass ratio of 3:1, and coat the film on a coating machine with a scraper gap of 400um. After the film is formed, the solvent is dried and then transferred to a vacuum drying oven for drying at 60°C. Dry for 24 hours to obtain a polymer protective layer with a thickness of 100 μm.

[0093] The above-mentioned metal protective layer of the lithium metal negative electrode with the Li-Ag alloy protective layer is opposed to the polymer protective la...

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Abstract

The invention provides a lithium metal anode protective layer as well as a preparation method and application thereof. The lithium metal anode protective layer comprises a metal protective layer and apolymer protective layer, the metal protective layer is formed on a lithium metal anode plate, and at least one part of metal of the metal protective layer reacts with the lithium metal anode plate to form an alloy layer; and the polymer protective layer comprises a polymer and a lithium salt, and the polymer protective layer is formed on the metal protective layer. When the lithium metal anode protective layer is used for the battery, lithium dendrites can be prevented from being generated, the lithium metal anode is prevented from directly contacting with the electrolyte layer to react, andthe interface impedance between the negative plate and the electrolyte layer is reduced, so that the cycle performance, the rate capability, the safety performance, the service life and the like of the battery are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a lithium metal negative electrode protection layer and a preparation method and application thereof. Background technique [0002] With the rapid development of consumer electronics, electric vehicles, etc., the demand for energy density, safety reliability and service life of batteries is also soaring. Lithium metal has a very high theoretical specific capacity (about 3860mAh / Kg) and the lowest potential (-3.04V), so lithium metal secondary batteries are the preferred system for the next generation of high energy density energy storage devices. Solid-state batteries have attracted extensive attention from researchers because of the absence of electrolyte inside, which can effectively avoid potential safety hazards caused by electrolyte leakage and other problems, and have the advantages of high energy density and no memory effect. [0003] However, due to the hig...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/139H01M4/62H01M10/052H01M12/08
CPCH01M4/134H01M4/139H01M4/62H01M10/052H01M12/08H01M2004/027Y02E60/10
Inventor 郑晓醒秦士林朱朋辉陈少杰周龙捷邓素祥马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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