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Preparation method of composite metal lithium negative electrode

A composite metal and lithium negative electrode technology, which is applied in electrode manufacturing, electrode rolling/calendering, battery electrodes, etc., can solve the problems of difficult industrialization, high cost and safety hazards, and achieves simple preparation methods, constant area, and consistency sexual effect

Inactive Publication Date: 2018-09-28
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process needs to melt solid metal lithium into a liquid state or gasify it into a gaseous state, which has high cost and safety hazards, and it is difficult to realize industrialization.

Method used

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  • Preparation method of composite metal lithium negative electrode
  • Preparation method of composite metal lithium negative electrode
  • Preparation method of composite metal lithium negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, the entrainment with a thickness of 0.5 mm prepared by coating technology using graphite powder and PTFE as raw materials is spread on the surface of lithium metal, and the lithium metal is bent 180° in the width direction by cold bending forming technology. Form a composite structure of lithium / entrainment / lithium, and then roll, and the deformation of the down-press is 20% to 50%, to obtain a composite material that has been rolled once, and then spread the entrainment on the surface of the composite material that has been rolled for the first time Perform cold bending and rolling, and repeat this step 3 to 20 times, so as to obtain a composite lithium metal negative electrode material with a multi-layer structure, and perform automatic winding at the end of the rolling machine. The metal lithium layer of the material has a thickness of 20um, and the content of inorganic materials in the metal lithium layer is less than 5%; the thickness of ...

Embodiment 2

[0036]The entrainment with a thickness of 1mm prepared by using titanium carbide nanowires and PVDF as raw materials and screen printing technology is flattened on the surface of lithium metal, and the lithium metal is bent 180° in the width direction by cold bending forming technology to form lithium metal. The composite structure of / entrainment / lithium is then rolled, and the deformation amount is 20% to 50% to obtain a composite material that has been rolled once, and then the entrainment is flatly spread on the surface of the composite material rolled for the first time for cooling. Bending, rolling, and repeating this step 3 to 20 times, so as to obtain a composite lithium metal negative electrode material with a multi-layer structure, and perform automatic winding at the end of the rolling machine. The metal lithium layer of the material has a thickness of 1um, and the content of inorganic materials in the metal lithium layer is less than 5%; the thickness of the entrain...

Embodiment 3

[0038] Using silica fiber and PTFE as raw materials, entrainment with a thickness of 0.3mm prepared by tape casting technology is spread on the surface of lithium metal, and lithium metal is bent 180° in the width direction by cold bending forming technology to form lithium metal. The composite structure of / entrainment / lithium is then rolled, and the compression deformation is 20% to 50%, so as to obtain the composite material after one rolling. Then spread the entrainment on the surface of the composite material rolled for the first time for cold bending and rolling, and repeat this step 3 to 20 times to obtain a composite lithium metal negative electrode material with a multi-layer structure, and roll it at the end of the rolling machine Perform automatic rewinding. The metal lithium layer of the material has a thickness of 10um, and the content of inorganic materials in the metal lithium layer is less than 5%; the thickness of the entrainment layer is 10um, and the content...

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Abstract

The invention provides a preparation method of a composite metal lithium negative electrode. The preparation method comprises the steps of pasting an inorganic material with a polymer adhesive to forma layered clamping tape; laying the clamping tape on a surface of lithium metal, bending the lithium metal for 180 degrees in a width direction by a cold roll formation technology to form a lithium / clamping tape / lithium composite structure; and performing rolling, pressing with deformation quantity by 20-50% to obtain a composite material rolled in one time, and repeating the step for 3-20 timesto obtain the composite metal lithium negative electrode material with a multi-layer structure. By the method, the lithium deposition morphology is improved, lithium dendrites growth is suppressed, sothat the cycle property and the safety of the battery are improved, and industrial and continuous production of the composite metal lithium negative electrode can be achieved.

Description

technical field [0001] The invention belongs to the field of lithium ion secondary batteries, and in particular relates to a preparation method of a composite metal lithium negative electrode. Background technique [0002] As people have higher and higher requirements for the capacity, battery life and cycle life of lithium-ion batteries, the current material system and structure can no longer meet the demand. Among the known electrode materials, the lithium metal anode has attracted extensive attention from researchers at home and abroad for its high capacity of 3860mAh / g and the most negative potential (-3.040V vs. standard hydrogen electrode). [0003] Although the metal lithium anode has excellent performance, due to the presence of metal lithium, dendritic dendrites will grow on the surface due to the uneven deposition of lithium ions during the charging and discharging cycle of the battery, resulting in the pulverization of the lithium anode, increasing the internal re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1395H01M10/0525
CPCH01M4/0435H01M4/1395H01M10/0525Y02E60/10
Inventor 张磊李艳红李洋彭祖玲
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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