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Metal negative electrode and preparation method thereof, electrochemical battery and terminal

A metal anode and alkali metal salt technology, applied in the field of electrochemical cells, can solve the problems of large volume expansion, uneven metal deposition on the surface of the metal anode, dendrite growth, etc., to stabilize the anode interface, improve the coulombic efficiency of the anode, and reduce the concentration of The effect of differential polarization

Pending Publication Date: 2021-03-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a metal negative electrode with a protective layer on its surface. The protective layer can guide a uniform flow of metal ions, effectively inhibit the growth of dendrites on the surface of the negative electrode, reduce the occurrence of side reactions, and relieve the metal negative electrode from cycling. Volume expansion to solve the problems of uneven metal deposition, dendrite growth, and large volume expansion on the surface of existing metal negative electrodes to a certain extent

Method used

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  • Metal negative electrode and preparation method thereof, electrochemical battery and terminal
  • Metal negative electrode and preparation method thereof, electrochemical battery and terminal
  • Metal negative electrode and preparation method thereof, electrochemical battery and terminal

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preparation example Construction

[0065] Correspondingly, the embodiment of the present invention also provides a method for preparing a metal negative electrode, including:

[0066] Add the single-ion conductor polymer alkali metal salt into the organic solvent, and then coat the obtained dispersion on one or both sides of the metal negative electrode body to form a protective layer, wherein the single-ion conductor polymer alkali metal salt includes polymer Skeleton and sulfonimide rubidium salt or cesium sulfonimide grafted on the polymer backbone by chemical bonds.

[0067] In the embodiment of the present invention, the alkali metal salt of the single-ion conductor polymer is the alkali metal salt of the single-ion conductor polymer described in any one of the foregoing embodiments herein, and will not be repeated here.

[0068] In the embodiment of the present invention, the organic solvent can be nitrogen methyl pyrrolidone, acetone, acetonitrile, ethanol, dimethyl carbonate, ethyl methyl carbonate, die...

Embodiment 1

[0080] This embodiment provides a lithium metal negative electrode protected by poly(propylenesulfonyl)(trifluoromethylsulfonyl)imide cesium (A), and its preparation method comprises:

[0081] In a drying room, add 10g of poly(propylenesulfonyl)(trifluoromethylsulfonyl)imide cesium (A) and 0.2g of polyvinylidene fluoride (PVDF) into 100g of dimethyl ether, stir and mix to form a slurry . Then, the above slurry was coated on the surface of unprotected metal lithium by brushing, and the brushing time was 10 minutes to obtain a cesium poly(propylenesulfonyl)(trifluoromethylsulfonyl)imide protective layer with a thickness of 2 μm.

Embodiment 2

[0083] This embodiment provides a metal lithium negative electrode protected by poly(propylenesulfonyl)(perfluorobutylsulfonyl)imide rubidium (B), and its preparation method comprises:

[0084] In a drying room, add 20g of poly(propylenesulfonyl)(perfluorobutylsulfonyl)imide rubidium and 0.2g of polyvinylidene fluoride (PVDF) into 100g of ethylene glycol dimethyl ether, stir and mix to form a slurry . Then, the above slurry was coated on the surface of unprotected lithium metal by scraping, and the scraping time was 2 minutes to obtain a poly(propylenesulfonyl)(perfluorobutylsulfonyl)imide rubidium protective layer with a thickness of 3 μm.

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Abstract

The embodiment of the invention provides a metal negative electrode. The metal negative electrode comprises a metal negative electrode body and a protective layer formed on the surface of one side ortwo sides of the metal negative electrode body, the single ion conductor polymer alkali metal salt comprises a polymer skeleton and sulfonyl imide rubidium salt or sulfonyl imide cesium salt grafted on the polymer skeleton through a chemical bond. In the charging and discharging process of the battery, alkali metal cations in the alkali metal salt of the single-ion conductor polymer can constructa local high-concentration positive charge electrostatic electric field on the surface of the negative electrode, so that an electric field shielding effect is achieved, uniform metal ion flow is guided, and dendritic crystal growth is inhibited; and meanwhile, the protective layer can effectively relieve volume expansion of the metal negative electrode in the circulation process, stabilize a negative electrode interface, isolate direct contact between electrolyte and the metal negative electrode, reduce side reaction and improve coulombic efficiency of the negative electrode. The embodiment of the invention also provides a preparation method of the metal negative electrode, an electrochemical battery and a terminal.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of electrochemical batteries, in particular to a metal negative electrode and a preparation method thereof, an electrochemical battery and a terminal. Background technique [0002] With the development of economy and technology, from portable electronic devices (mobile phones, tablet computers, notebook computers), to drones to electric vehicles, these industries urgently need higher energy density, higher power density, longer cycle life and Safer energy storage devices. However, the energy density of lithium-ion batteries based on traditional graphite anodes is close to the ceiling, which can no longer meet people's growing demand for battery life and standby. Metal lithium has a high theoretical specific capacity (3860mAh / g) and the most negative electrochemical potential (-3.040V vs. SHE). The use of metal lithium anode can greatly increase the energy density of lithium batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/62H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 马强洪响
Owner HUAWEI TECH CO LTD
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