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A method for improving the performance of lithium negative electrode

A lithium negative electrode and performance technology, applied in the field of lithium negative electrode preparation, can solve the problems of battery short circuit, safety issues, and restrictions on lithium-sulfur batteries, and achieve the effects of inhibiting the generation of lithium dendrites, reducing irreversible reactions, and improving Coulombic efficiency

Active Publication Date: 2020-04-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fatal defect of lithium anode restricts the practical application of next-generation batteries such as lithium-sulfur batteries and lithium-air batteries.
These defects are generated by lithium dendrites formed during lithium deposition: on the one hand, lithium dendrites may pierce the separator and short-circuit the battery, causing safety issues; on the other hand, lithium dendrites expose more than the surface, Accelerate the irreversible reaction between lithium and electrolyte, and easily produce "dead lithium" during the cycle, resulting in a decrease in Coulombic efficiency

Method used

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  • A method for improving the performance of lithium negative electrode
  • A method for improving the performance of lithium negative electrode
  • A method for improving the performance of lithium negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0027] The first step is to clean the copper foil current collector.

[0028] The quality copper foil was immersed in deionized water, ethanol and acetone in the ratio (v:v, 1:1:1) of the mixed solution prepared at room temperature, then ultrasonically treated for 30min, and finally taken out and dried at 80°C for 1h.

[0029] In the second step, Au is plated on one side of the copper foil.

[0030] Put the cleaned copper foil current collector into an ion sputtering / evaporation integrated coating device, and sputter and evaporate for 90s to obtain a gold-plated Au@Cu electrode on one side.

[0031] The third step is to assemble the battery.

[0032] The prepared single-sided gold-plated Au@Cu electrode was used as the working electrode, and the lithium sheet was used as the counter electrode to form a button battery. The separator was made of polypropylene film, and the gold-plated side was placed on the opposite side of the separator. The electrolyte is selected to contain...

Embodiment example 2

[0040] The first step, copper foil current collector cleaning

[0041] The quality copper foil was immersed in deionized water, ethanol and acetone in the ratio (v:v, 1:1:1) of the mixed solution prepared at room temperature, then ultrasonically treated for 20min, and finally taken out and dried at 70°C for 2h.

[0042] The second step is to plate gold on one side of the copper foil

[0043] Put the cleaned copper foil current collector into an ion sputtering / evaporation integrated coating device, and sputter and evaporate for 60s to obtain a gold-plated Au@Cu electrode on one side.

[0044] The third step is to assemble the battery.

[0045] The prepared single-sided gold-plated Au@Cu electrode was used as the working electrode, and the lithium sheet was used as the counter electrode to form a button battery. The separator was made of polypropylene film, and the gold-plated side was placed on the opposite side of the separator. The electrolyte is selected to contain 1M lith...

Embodiment example 3

[0047] The first step is to clean the copper foil current collector.

[0048] The quality copper foil was immersed in deionized water, ethanol and acetone in the ratio (v:v, 1:1:1) of the mixed solution prepared at room temperature, then ultrasonically treated for 15min, and finally taken out and dried at 60°C for 3h.

[0049] In the second step, Au is plated on one side of the copper foil.

[0050] Put the cleaned copper foil current collector into an ion sputtering / evaporation integrated coating device, and sputter and evaporate for 30s to obtain a gold-plated Au@Cu electrode on one side.

[0051] The third step is to assemble the battery.

[0052] The prepared single-sided gold-plated Au@Cu electrode was used as the working electrode, and the lithium sheet was used as the counter electrode to form a button battery. The separator was made of polypropylene film, and the gold-plated side was placed on the opposite side of the separator. The electrolyte contains 1M lithium hexa...

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Abstract

The invention discloses a method for improving the performance of a lithium negative electrode, belongs to the field of electrode materials, and is a very simple and effective method. In the present invention, a commercial copper foil is used as a current collector, and a layer of gold is plated on one side by a rotary evaporation method to obtain a gold-plated Au@Cu electrode on one side; when assembling a battery, a polypropylene film is used as a separator, and a lithium sheet is used as a counter electrode. The gold-plated Au@Cu electrode was used as the working electrode, where the gold-plated side was opposite to the separator. In the method adopted in the present invention, since the single-sided gold-plated Au@Cu electrode is used, lithium is selectively deposited on Au, and grows opposite to the diaphragm, preventing dendrites from piercing the diaphragm, which can effectively improve the safety performance of the lithium negative electrode; at the same time, When Li dendrites grow downward, due to the effect of resistance, lithium will be deposited more uniformly, effectively inhibiting the generation of lithium dendrites, and improving the Coulombic efficiency of lithium negative electrodes.

Description

technical field [0001] The invention belongs to the field of electrode materials, and relates to a preparation method of a lithium negative electrode and its application in batteries. Background technique [0002] The energy density of lithium-ion batteries is no longer sufficient to meet the needs of many applications in today's society, so next-generation batteries with higher energy densities (such as lithium-sulfur batteries, lithium-air batteries, etc.) have received extensive attention. In these batteries, lithium anodes are used as the anode, so it is necessary to study lithium anodes with high performance. [0003] Lithium negative electrode has many advantages, such as: (1) the lowest potential (-3.040V); (2) environmental friendliness; (3) ultra-high theoretical specific capacity up to 3860mAh / g, etc. However, the fatal defects of lithium anode restrict the practical application of next-generation batteries such as lithium-sulfur batteries and lithium-air batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M10/052H01M10/058H01M10/42
CPCH01M4/0426H01M4/134H01M4/1395H01M10/052H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 张凤祥郭峻岭赵淑鹏
Owner DALIAN UNIV OF TECH
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