Lithium metal negative electrode composite modification method

A lithium metal negative electrode, modification and modification technology, applied in battery electrodes, lithium storage batteries, secondary battery repair/maintenance, etc., can solve problems such as unfavorable low-carbon production, increase production energy consumption, etc. Effects of non-uniform growth, low condition requirements, excellent ionic conductivity and flexibility

Pending Publication Date: 2022-07-29
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, α-lipoic acid has strong adsorption properties on the surface of metal lithium, and combines with lithium ions to form an organic SEI layer (patent CN112740460A), but this scheme needs to first heat α-lipoic acid above the melting point temperature to make it occur. The ring-opening reaction and free radical polymerization reaction form a polymer used as a protective film, which greatly increases the energy consumption of its production, which is not conducive to low-carbon production
[0005] In addition, in this field, the modification of α-lipoic acid on the surface of metal lithium is usually achieved by adding in the e

Method used

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  • Lithium metal negative electrode composite modification method
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  • Lithium metal negative electrode composite modification method

Examples

Experimental program
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Example Embodiment

[0043] Example 1

[0044] A method for compound modification and modification of a lithium metal negative electrode, comprising the following steps:

[0045] (1) Preparation of α-lipoic acid solution:

[0046] In an argon-protected glove box, dissolve α-lipoic acid in propylene carbonate, and stir at room temperature to prepare α-lipoic acid solution;

[0047] (2) Dissolving antimony trifluoride:

[0048] In an argon-protected glove box, dissolve antimony trifluoride in α-lipoic acid solution, stir at room temperature to prepare a mixed solution; the concentration of α-lipoic acid in the mixed solution is 0.05mol / L, SbF 3 The concentration of 0.1mol / L;

[0049] (3) Lithium metal sheet pretreatment:

[0050] Place the lithium metal sheet in a glove box protected by argon gas, and use a brush to brush the lithium metal sheet in tetrahydrofuran until the surface is glossy to obtain a polished lithium metal sheet, which is to be dried at 25°C after polishing;

[0051] (4) Modif...

Example Embodiment

[0059] Example 2

[0060] A method for compound modification and modification of a lithium metal negative electrode, comprising the following steps:

[0061] (1) Preparation of α-lipoic acid solution:

[0062] In an argon-protected glove box, dissolve α-lipoic acid in propylene carbonate, and stir at room temperature to prepare α-lipoic acid solution;

[0063] (2) Dissolving antimony trifluoride:

[0064] In an argon-protected glove box, dissolve antimony trifluoride in α-lipoic acid solution and stir at room temperature to prepare a mixed solution; the concentration of α-lipoic acid in the mixed solution is 0.01 mol / L, SbF 3 The concentration of 0.02mol / L;

[0065] (3) Lithium metal sheet pretreatment:

[0066] Place the lithium metal sheet in a glove box protected by argon gas, and use a brush to brush the lithium metal sheet in tetrahydrofuran until the surface is glossy to obtain a polished lithium metal sheet, which is to be dried at 25°C after polishing;

[0067] (4...

Example Embodiment

[0072] Example 3

[0073] A method for compound modification and modification of a lithium metal negative electrode, comprising the following steps:

[0074] (1) Preparation of α-lipoic acid solution:

[0075] In an argon-protected glove box, dissolve α-lipoic acid in a mixed solvent with an equal molar ratio of propylene carbonate and dimethyl ether, and stir at room temperature to prepare α-lipoic acid solution;

[0076] (2) Dissolving antimony trifluoride:

[0077] In an argon-protected glove box, dissolve antimony trifluoride in α-lipoic acid solution, stir at room temperature to prepare a mixed solution; the concentration of α-lipoic acid in the mixed solution is 0.02mol / L, SbF 3 The concentration of 0.2mol / L;

[0078] (3) Lithium metal sheet pretreatment:

[0079] Place the lithium metal sheet in a glove box protected by argon gas, and use a brush to brush the lithium metal sheet in tetrahydrofuran until the surface is glossy to obtain a polished lithium metal sheet,...

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Abstract

The invention relates to a composite modification method for a lithium metal negative electrode and application of the material to preparation of a lithium metal battery negative electrode, and belongs to the field of lithium metal battery negative electrode materials. Metal antimony ions and alpha-lipoic acid molecules are introduced into a reaction system, and an organic/inorganic coating layer is constructed on the surface of metal lithium by virtue of reaction among the metal antimony ions, the alpha-lipoic acid molecules and the metal lithium, so that the formation of an artificial solid electrolyte interface SEI on the surface of the metal lithium is realized; the method is simple and easy to implement, the forming speed of the coating layer on the lithium metal surface can be effectively controlled, the surface coating uniformity is improved, and the high ionic conductivity of the inorganic SEI film and the flexibility of the organic SEI film are combined, so that the cycle performance and the rate performance of the lithium metal battery are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a method for compound modification and modification of a lithium metal negative electrode. Background technique [0002] Lithium metal anode has the highest theoretical specific capacity (3860mAh g -1 ) and lower electrochemical potential (-3.045 V relative to standard hydrogen electrodes), have gained widespread attention from developers of next-generation lithium batteries. Lithium metal anodes can broaden the options for battery cathodes, enabling the use of lithium-free, high-capacity cathode materials such as sulfur, oxygen, and high-potential fluorides in batteries. However, the practical application of metallic lithium secondary batteries, including lithium-sulfur batteries, has been hindered by poor cycle stability and safety issues. During the continuous charge-discharge process, the uneven deposition of Li metal produces uneven electric fields an...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M10/052H01M10/42
CPCH01M4/1395H01M10/052H01M10/4235
Inventor 史家远杨清华徐旭升陈晓涛石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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