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A composite metal lithium negative electrode with filler and preparation method thereof

A technology of composite metal and lithium negative electrode, applied in the direction of negative electrode, active material electrode, battery electrode, etc., can solve complex and dangerous problems, and achieve the effect of improving cycle performance, simple operation, and slowing down the volume expansion effect.

Active Publication Date: 2021-01-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these methods are complicated and dangerous, and they also generate a lot of waste

Method used

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  • A composite metal lithium negative electrode with filler and preparation method thereof
  • A composite metal lithium negative electrode with filler and preparation method thereof
  • A composite metal lithium negative electrode with filler and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Using carbon paper as a skeleton material and polyacrylonitrile as a filler, a composite metal lithium negative electrode is obtained, which specifically includes metal lithium, carbon paper and polyacrylonitrile filled in the pore structure of the carbon paper. Prepare as follows:

[0035] (1) Dissolve polyacrylonitrile in N-methylpyrrolidone, stir evenly until polyacrylonitrile can be completely dissolved in the solvent, and the slurry is relatively viscous, and the obtained slurry is coated on carbon paper (average pore size 100 μm), baked After 6 hours of dry treatment, polyacrylonitrile fills the pores of the carbon paper to obtain the treated carbon paper; as figure 2 Shown is the SEM image of carbon paper after polyacrylonitrile filled pores, from figure 2 It can be seen that the pores of the carbon paper are completely filled by polyacrylonitrile.

[0036] (2) Align and stack the treated carbon paper obtained in step (1) and the lithium strip with a thicknes...

Embodiment 2

[0040]A composite metal lithium negative electrode is obtained by using copper mesh as a skeleton material (average pore diameter of 100 μm) and polyacrylonitrile as a filler, which specifically includes metal lithium, copper mesh and polyacrylonitrile filled in the copper mesh structure.

[0041] Prepare as follows:

[0042] (1) Dissolve polyacrylonitrile in N-methylpyrrolidone, polyacrylonitrile can be completely dissolved in the solvent, coat the resulting slurry on the copper grid, dry for 6 hours, and fill the polyacrylonitrile into the copper mesh structure , to obtain the processed copper mesh skeleton;

[0043] (2) Align and stack the treated copper mesh skeleton obtained in step (1) and the lithium strip with a thickness of 50 μm, and roll it through a rolling mill at a pressure of 8 MPa and a temperature of 60° C. A copper mesh / lithium ribbon composite metal lithium negative electrode with polyacrylonitrile-filled pores was obtained.

[0044] Such as image 3 The ...

Embodiment 3

[0050] Using carbon paper as the skeleton material and a mixture of polyacrylonitrile and polyethylene as the filler, a composite metal lithium negative electrode is obtained, which specifically includes metal lithium, carbon paper, and polyacrylonitrile and polyethylene filled in the carbon paper pore structure . Prepare as follows:

[0051] (1) Dissolve polyacrylonitrile and polyethylene in acetone, coat the resulting solution on carbon paper (average pore size 100 μm), dry for 6 hours, fill the pores of the carbon paper with polyacrylonitrile and polyethylene, and obtain Treated carbon paper skeleton;

[0052] (2) Align and stack the treated carbon paper obtained in step (1) and the lithium tape with a thickness of 33 μm, and press it through a punching machine at a pressure of 0.1 MPa and a temperature of 20°C; after stamping, the ultra-thin lithium tape is pasted with carbon paper combined to obtain a carbon paper / lithium ribbon composite metal lithium negative electrod...

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Abstract

The invention discloses a composite metal lithium negative electrode with filler and a preparation method thereof, and belongs to the technical field of secondary batteries. The composite metal lithium negative electrode comprises metal lithium, a framework material and a filler, wherein the filler is filled in a pore structure of the framework material; the pore structure of the framework material is filled with or not filled with the filler; and the metal lithium is combined with the framework material in a pressing mode such as rolling. According to the composite metal lithium negative electrode provided by the invention, the filler can regulate and control the deposition behavior of metal lithium in the macroporous structure of the framework material, inhibit the growth of lithium dendrites in the macroporous structure of the framework material, slow down the volume expansion effect and effectively improve the cycle performance of a battery.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, in particular to a composite metal lithium negative electrode with a filler and a preparation method thereof. Background technique [0002] Due to the development of electric vehicles and portable electronic devices, there is an increasing demand for high energy density batteries in contemporary society. Since the 1990s, lithium-ion battery systems based on graphite anodes have achieved great success, but after decades of development, the existing energy density of lithium-ion batteries is close to its theoretical energy density, which is relatively low The theoretical energy density limits its further application as a next-generation portable power source. Compared with graphite negative electrode, metal lithium has extremely high specific capacity (3860mAh g -1 ) and extremely low reduction potential (-3.040V relative to the standard hydrogen electrode), known as the "holy grail" ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/134H01M4/1395H01M4/362H01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 张强石鹏张学强
Owner TSINGHUA UNIV
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