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A three-dimensional structure composite metal lithium negative electrode and preparation method thereof

A composite metal, three-dimensional structure technology, applied in the direction of negative electrodes, structural parts, battery electrodes, etc., can solve problems such as difficult to avoid dendrites

Active Publication Date: 2022-08-05
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above prior art suppresses the generation of dendrites through the three-dimensional framework, it only provides a way to suppress the growth of dendrites, but it is difficult to avoid the appearance of dendrites on the top of the negative electrode conductor.

Method used

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  • A three-dimensional structure composite metal lithium negative electrode and preparation method thereof
  • A three-dimensional structure composite metal lithium negative electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] refer to figure 1 , is a three-dimensional structure composite metal lithium negative electrode disclosed in the present invention, comprising a metal mesh layer, the material of the metal mesh layer is copper; the mesh shape of the metal mesh layer is circular, and the aperture of the mesh is 0.01 μm.

[0048] like figure 1 As shown, the three-dimensional structure composite metal lithium negative electrode further includes a metal lithium layer, the lower part of the metal mesh layer is inserted into the metal lithium layer, and the thickness of the metal mesh layer penetrated in the metal lithium layer is the same as the thickness of the metal lithium layer, and the metal lithium layer has the same thickness. The thickness of the layer is (the surface capacity value of the positive pole piece × (1-Coulomb efficiency) × 5 × the expected number of cycles + (0 to 10)) μm, so that the lithium of the metal lithium layer preset in the lower part of the metal mesh layer can...

Embodiment 2

[0057] The difference from Example 1 is that, as figure 2 As shown, a preparation method of a three-dimensional structure composite metal lithium negative electrode, the preparation process includes:

[0058] Preparation of metal mesh layer; at least one method of laser etching, chemical etching, and physical weaving;

[0059] Coat the insulating layer on the upper part of the metal mesh layer; prepare the components of the insulating layer and the solvent into a glue solution, and apply the glue solution on the upper part of the metal mesh layer with a scraper or spin coater, and then apply the glue to the top of the metal mesh layer. The components of the insulating layer are melted and covered on the upper half of the metal mesh layer, the melting temperature is 200°C, and finally cooled to room temperature; the solvent is N-methylpyrrolidone, etc.;

[0060] Insert the lower part of the metal mesh layer into the metal lithium layer; insert the lower part of the metal mesh...

Embodiment 3

[0064] The difference from Example 1 is that, as figure 2 As shown, a preparation method of a three-dimensional structure composite metal lithium negative electrode, the preparation process includes:

[0065] Preparation of metal mesh layer; at least one method of laser etching, chemical etching, and physical weaving;

[0066] Coat the insulating layer on the upper part of the metal mesh layer; use a powder beater to beat the components of the insulating layer into dry fine powder with a particle size of 500nm, and then immerse the upper part of the metal mesh layer to generate electrostatic adsorption, so that the components of the insulating layer Adsorbed to the upper part of the metal mesh layer, and then heated by a box furnace to melt the components of the insulating layer and cover the upper half of the metal mesh layer, the melting temperature is 500 ℃, and finally cooled to room temperature;

[0067] Insert the lower part of the metal mesh layer into the metal lithi...

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Abstract

The invention relates to the technical field of lithium battery negative electrodes, and discloses a three-dimensional structure composite metal lithium negative electrode and a preparation method thereof, comprising a metal lithium layer and a metal mesh layer, the lower part of the metal mesh layer is inserted into the metal lithium layer, and the upper part of the metal mesh layer Perforated above the metal lithium layer, the top of the metal mesh layer is coated with an insulating layer. The present invention has the following advantages and effects: the metal mesh layer penetrated above the metal lithium layer accommodates the lithium element deposited by the positive electrode; a three-dimensional carrier with electronic conductivity and not alloyed with metal lithium is constructed inside and on the surface of the metal lithium layer (ie metal mesh layer), and an insulating layer that does not conduct electron ions is attached to the top surface of the carrier, so that the deposited lithium ions can only obtain electrons in the metal mesh layer on the surface of the metal lithium layer, and cannot be in the metal mesh layer. The top of the electrode gets electrons, so that lithium dendrites and dead lithium that exceed the thickness of the surface metal mesh layer are formed to avoid the appearance of dendrites on the top of the negative electrode conductor.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative electrodes, in particular to a three-dimensional structure composite metal lithium negative electrode and a preparation method thereof. Background technique [0002] Compared with the current commercial graphite anodes in Li-ion batteries, Li metal anodes can theoretically provide more capacity (3860mAh g-1, graphite anode: 372mAh g-1) and the most negative potential (-3.040V vs. , standard hydrogen electrode, graphite anode: ~1.0V vs.Li + / Li), which is expected to achieve larger applications in the next-generation portable electronic devices and electric vehicles. Lithium-sulfur batteries and lithium-air batteries with lithium metal as the negative electrode have gradually attracted the attention of researchers and have become a hot spot in academic and industrial research in recent years. However, there are still many problems in the research of lithium metal anode, the most ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38H01M4/66H01M4/74H01M10/0525
CPCH01M4/382H01M4/745H01M4/661H01M4/134H01M4/1395H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 许晓雄张秩华崔言明
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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