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Composite metal lithium negative electrode with filler and preparation method thereof

A composite metal and lithium negative electrode technology, applied in the direction of negative electrodes, active material electrodes, battery electrodes, etc., can solve complex and dangerous problems, achieve the effects of improving cycle performance, making materials easy to use, and inhibiting the growth of lithium dendrites

Active Publication Date: 2020-03-27
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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  • Composite metal lithium negative electrode with filler and preparation method thereof
  • Composite metal lithium negative electrode with filler and preparation method thereof
  • 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, coat the obtained slurry on carbon paper (average pore size 100 μm), bake After dry treatment for 6h, polyacrylonitrile is filled in the pores of the carbon paper, that is, the treated carbon paper is obtained; such as figure 2 Shown is the SEM image of carbon paper after polyacrylonitrile filling the pores, from figure 2 It can be seen that the pores of the carbon paper are completely filled with polyacrylonitrile.

[0036] (2) Aligning and stacking the treated carbon paper obtained in step (1) and a lithium ...

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] like image 3 The SEM...

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

Claims

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Application Information

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Patent Type & Authority Applications(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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