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Metal lithium negative electrode with preset stable protective film and preparation method thereof

A protective film, metal lithium technology, applied in the field of metal lithium anode, can solve the problems of poor interface stability between metal lithium anode and electrolyte, and achieve the effects of improving cycle stability, improving cycle stability, and inhibiting lithium dendrite growth.

Active Publication Date: 2020-03-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the poor stability of the interface between the metal lithium negative electrode and the electrolyte and bring about a series of safety problems. The present invention provides a metal lithium negative electrode with a preset stable protective film and its preparation method

Method used

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  • Metal lithium negative electrode with preset stable protective film and preparation method thereof
  • Metal lithium negative electrode with preset stable protective film and preparation method thereof
  • Metal lithium negative electrode with preset stable protective film and preparation method thereof

Examples

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specific Embodiment approach 1

[0032] Specific Embodiments 1. In this embodiment, the preparation method of the metal lithium negative electrode with a preset stable protective film is carried out according to the following steps:

[0033] Step 1. Roughen the surface of the copper foil current collector: Soak the copper foil (or foamed copper) with 10% (mass) hydrochloric acid and oxygen for 30 minutes, then soak in distilled water, wash and dry with cold wind.

[0034] Step 2, the specific method of coating the elastic organic polymer protective film and curing to improve the strength is: (1) Lithium fluoride is mixed with PVDF-HFP in a ratio of 50% as a lithium salt, and added to acetone:DMAC with a ratio of 2:1 In the solvent, the ratio of the mixture to the solvent is 3:100 (mass ratio). Stir at room temperature for 12 hours, then ultrasonically for 2 hours to achieve uniformity and dispersion; (2) uniformly coat or dip-coat the dispersion in step 2 (1) on the surface of the roughened current collector ...

specific Embodiment approach 2

[0037] Embodiment 2. In this embodiment, the preparation method of the metal lithium negative electrode with a preset stable protective film is carried out according to the following steps:

[0038] Step 1. Roughen the surface of the copper foil current collector: Soak the copper foil or foamed copper with 10% hydrochloric acid and oxygen for 30 minutes, then soak in distilled water, wash and dry with cold wind.

[0039]Step 2, the specific method of coating the elastic organic polymer protective film and curing to improve the strength is as follows: (1) LiTFSi is mixed with PVDF-HFP at a ratio of 10% as an additive, and added to acetone: DMAC in a solvent of 2:1, The ratio of mixture to solvent is 3:100 (mass ratio). Stir at room temperature for 12 hours, then ultrasonically for 2 hours to achieve uniformity and dispersion; (2) uniformly coat or dip-coat the dispersion in step 2 (1) on the surface of the roughened current collector described in step 1; (3) The current collec...

specific Embodiment approach 3

[0042] Specific Embodiment Three. In this embodiment, the preparation method of the metal lithium negative electrode with a preset stable protective film is carried out according to the following steps:

[0043] Step 1. Roughen the surface of the copper foil current collector: Soak the copper foil or foamed copper with 10% hydrochloric acid and oxygen for 30 minutes, then soak in distilled water, wash and dry with cold wind.

[0044] Step 2, the specific method of coating the elastic organic polymer protective film and curing to improve the strength is: (1) nano-alumina particles are mixed with PVDF-HFP in a ratio of 10% as an additive, and added to acetone: DMAC is 2:1 In the solvent, the ratio of the mixture to the solvent is 3:100 (mass ratio). Stir at room temperature for 12 hours, then ultrasonically for 2 hours to achieve uniformity and dispersion; (2) uniformly coat or dip-coat the dispersion in step 2 (1) on the surface of the roughened current collector described in s...

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Abstract

The invention discloses a metal lithium negative electrode with a preset stable protective film and a preparation method thereof, which belong to the field of metal lithium negative electrode secondary batteries such as lithium-sulfur batteries and aim to solve the problems of poor safety and cycling stability of the metal lithium negative electrode. The method comprises the following steps of: roughening the surface of a current collector such as a copper foil or foamy copper in advance, then coating a polymer / ceramic composite film, and then electrically depositing metal lithium between thecurrent collector and a protective film. The lithium ion conduction and electronic insulation of the preset protective film ensure that the electrodeposited metal lithium is deposited on the interfaceof the protective film and the current collector. The preset protective film has elasticity, can keep complete along with the displacement of the surface of the metal lithium in the charging and discharging process, and has enough strength to prevent lithium dendrites from being generated, so that the safety of the metal lithium negative electrode is improved; the protective film separates the metal lithium from the electrolyte to prevent reaction, dead lithium cannot be generated, the shuttle effect can be inhibited in the lithium-sulfur battery, and the cycling stability is good. And the metal lithium negative electrode with the preset protective film is stable in air, so that the battery is convenient to assemble.

Description

technical field [0001] The invention belongs to the field of metal lithium negative electrodes in high specific energy lithium metal secondary batteries, and specifically relates to a metal lithium negative electrode with a preset stable protective film and a preparation method thereof. Background technique [0002] At present, the anode materials that have been actually used in lithium-ion batteries are basically carbon materials, such as artificial graphite, natural graphite, mesocarbon microspheres, petroleum coke, carbon fiber, pyrolytic resin carbon, etc. With the increasing demand for energy density of lithium-ion batteries, the existing carbon material anode system can no longer meet the requirements of ultra-high specific energy. The lithium metal negative electrode has a theoretical specific capacity of up to 3860mah / g, more than 11 times that of graphite, and is the long-awaited secondary lithium battery negative electrode material in the battery industry. If the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M2/16H01M2/14H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/667H01M4/134H01M4/1395H01M4/366H01M4/382H01M4/628H01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 王殿龙王博康海瑞宋仁升王飞
Owner HARBIN INST OF TECH
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