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Elastic lithium metal negative electrode surface modification layer, preparation method thereof and lithium metal negative electrode

A lithium metal negative electrode and surface modification technology, which is applied in the direction of electrode manufacturing, battery electrodes, spraying manufacturing, etc., to achieve the effect of increasing the contact area, improving the resistance to moisture and air, and the preparation method is simple and easy

Active Publication Date: 2019-08-09
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned preparation method of all-solid-state room temperature lithium batteries has good flexibility and can be cycled more than 400 times. In hundreds of experiments, no explosion accidents have occurred, but it has not solved the problem of lithium dendrites at the lithium metal / electrolyte interface. , the cycle life of the battery still needs to be strengthened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation method of lithium metal negative electrode, comprises the following steps:

[0057] (1) Take 1 g organic fluorine thermoplastic elastomer DuPont ETFE 220 and 5g Cu 3 N Stir evenly under vacuum at 220°C;

[0058] (2) The above slurry was uniformly sprayed on the surface of lithium metal, wherein the nozzle temperature was 230°C, and the nozzle size and spraying time were controlled until the spraying thickness was 20 μm.

[0059] (3) The above lithium metal was heated in vacuum at 80°C for 6 hours, so that the sprayed material reacted thoroughly with the surface of the lithium metal and defoamed, and after cooling, a viscoelastic SEI film was obtained on the surface of the lithium metal.

[0060] The above process is all under argon atmosphere, the vacuum degree is 2×10 -2Pa Next complete.

[0061] With 1M LiPF 6 The mixed solution dissolved in EC / DMC (volume ratio 1:1) is the electrolyte, PP is the diaphragm, and the lithium metal negative electrode ...

Embodiment 2

[0063] The preparation method of lithium metal negative electrode, comprises the following steps:

[0064] (1) Take 3 g of silicone-based thermoplastic elastomer Dow Corning TPSiV™3010-60A and 10 g of AlF and stir evenly under vacuum at 200 °C;

[0065] (2) Spray the above slurry evenly on the surface of lithium metal, where the nozzle temperature is 210°C, and control the nozzle size and spraying time until the spraying thickness is 30 μm;

[0066] (3) The above lithium metal was heated in vacuum at 60°C for 6 hours, so that the sprayed material reacted thoroughly with the surface of the lithium metal and defoamed, and after cooling, a viscoelastic SEI film was obtained on the surface of the lithium metal.

[0067] The above process is all under argon atmosphere, the vacuum degree is 2×10 -2Pa Next complete.

[0068] With 1mol / L LiPF 6 The mixed solution dissolved in EC / DMC (volume ratio 1:1) is the electrolyte, PP is the diaphragm, and the lithium metal negative electrode...

Embodiment 3

[0070] The preparation method of lithium metal negative electrode, comprises the following steps:

[0071] (1) Take 2 g polyurethane / polyamide blended elastomer and 8 g Li 2 S 6 and P 2 S 5 Stir evenly under vacuum at 190°C;

[0072] (2) The above slurry was uniformly sprayed on the surface of lithium metal, wherein the nozzle temperature was 200°C, and the nozzle size and spraying time were controlled until the spraying thickness was 10 μm.

[0073] (3) The above-mentioned lithium metal was heated at 100 °C for 6 hours in vacuum, so that the sprayed material reacted thoroughly with the surface of the lithium metal and degassed, and after cooling, a viscoelastic SEI film was obtained on the surface of the lithium metal.

[0074] The above process is all under argon atmosphere, the vacuum degree is 2×10 -2Pa Next complete.

[0075] Among them, the polyurethane / polyamide blended elastomer is German Bayer 9385 polyurethane and Japanese Toray PA6CM1017 polyamide according to...

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Abstract

The invention relates to the technical field of lithium metal negative electrodes, and in particular relates to an elastic lithium metal negative electrode surface modification layer, a preparation method thereof and a negative electrode. The raw materials comprise, by weight, 1 to 3 parts of elastomer material and 5 to 10 parts of inorganic material. The elastomer material and the elastomer material are mixed to form a modified layer with the thickness of 1 to 50 microns. An artificial SEI layer is constructed through organic and inorganic mixing. Compared with a single-component artificial SEI layer, the mixed layer has obvious synergistic effect. An inorganic phase provides mechanical strength to prevent the growth of Li dendrites. An organic phase provides elastic deformation ability and relaxation resilience to maintain the integrity of the SEI layer during the cycle. Solvent-free preparation is achieved during a preparation process, which improves the stability of lithium metal,and reduces the production cost and environment pollution.

Description

technical field [0001] The invention relates to the technical field of lithium metal negative electrodes, in particular to an elastic lithium metal negative electrode surface modification layer, a preparation method thereof and a lithium metal negative electrode. Background technique [0002] With the proposal of the national new energy strategy, new energy electric vehicles have developed rapidly. However, the commercialized lithium-ion battery with graphite as the negative electrode is basically close to its theoretical capacity, and it is difficult to meet the requirements of electric vehicles for long battery life and fast charging, and it is also difficult to meet the increasingly high demands of portable electronic devices and large-scale energy storage. application requirements. It is imperative to develop a new lithium battery system. Among the materials that can be used as the negative electrode of lithium batteries, metallic lithium has the largest theoretical ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1395H01M4/04H01M4/134
CPCH01M4/628H01M4/1395H01M4/0419H01M4/134Y02E60/10
Inventor 许晓雄崔言明刘张波黄园桥
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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