A preparation method and application of a modified metal lithium negative electrode current collector

A current collector and metal lithium technology, which is applied in the field of improving the lithium affinity of the current collector surface, can solve the problems of high cost and complicated operation, and achieve the effect of low energy consumption, simple operation, and improved affinity with lithium

Active Publication Date: 2021-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modification methods reported so far are usually complicated and costly

Method used

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  • A preparation method and application of a modified metal lithium negative electrode current collector
  • A preparation method and application of a modified metal lithium negative electrode current collector

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Prepare a 20% mass fraction of potassium fluoride solution. The copper foam grown with copper hydroxide nanoarrays was placed in the solution, soaked at 25 °C for 120 min, washed and dried in vacuum. The 1,3 dioxolane / ethylene glycol dimethyl ether mixed solution containing bis(trifluoromethanesulfonyl)imide lithium and lithium nitrate was used as the electrolyte, and the lithium foil was used as the counter electrode, 0.1 mA cm -2 , 0.1 mAhcm -2 Under the test conditions, the Coulombic efficiency reaches 95%.

Embodiment 2

[0027] Prepare saturated sodium fluoride solution. The copper foam grown with copper hydroxide nanoarrays was placed in the above solution, soaked at 50 °C for 30 min, washed and dried in vacuum. The 1,3 dioxolane / ethylene glycol dimethyl ether mixed solution containing bis(trifluoromethanesulfonyl)imide lithium and lithium nitrate was used as the electrolyte, and the lithium foil was used as the counter electrode, 0.1 mA cm -2 , 0.1 mAh cm -2 Under the test conditions, the Coulombic efficiency is 94%.

Embodiment 3

[0029] The copper foam grown with copper hydroxide nanoarrays was placed in 1 M potassium chloride aqueous solution, soaked at 50 °C for 30 min, washed and dried in vacuum. The 1,3 dioxolane / ethylene glycol dimethyl ether mixed solution containing bis(trifluoromethanesulfonyl)imide lithium and lithium nitrate was used as the electrolyte, and the lithium foil was used as the counter electrode, 0.1 mA cm -2 , 0.1 mAh cm -2 Under the test conditions, the Coulombic efficiency is 90%.

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Abstract

The invention discloses a preparation method and application of a modified metal lithium negative electrode current collector. The method comprises the following steps: step 1, adding a halogen salt into a solvent, stirring and mixing evenly to obtain a halogen salt solution; step 2, The current collector to be modified is placed in the brine salt solution prepared in step 1 for soaking modification treatment. The present invention improves the lithium affinity of the surface of the metal lithium negative electrode current collector through a simple current collector surface modification treatment method, avoids dendrite growth, and thereby realizes the practical application of the lithium metal battery. The preparation method is simple to operate, low in energy consumption, and can be operated on a large scale, and can modify the current collector with the array / coating layer grown on the surface. The lithium metal battery with good cycle stability and safety performance can be prepared by using the modified metal lithium negative electrode collector of the present invention, and the practical process of high specific energy lithium metal battery is promoted.

Description

technical field [0001] The invention belongs to the technical field of metal lithium batteries, and relates to a preparation method and application of a modified current collector capable of inhibiting the generation of lithium dendrites, and in particular to a method for improving the lithium affinity of the current collector surface by treating the surface with a halogen salt solution method and its application. Background technique [0002] There is an increasing demand for high-density, high-security storage devices. Lithium metal batteries have a high theoretical specific capacity (3860 mAh g -1 ) and extremely low redox potential (−3.04 V vs. SHE) are considered ideal anode materials. Metal lithium anode is used in combination with various high-energy cathode materials such as oxygen and sulfur, which can significantly increase the overall energy density of the battery. However, lithium metal batteries have serious dendrite growth problems, making it difficult to cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/1395H01M4/04H01M10/052
CPCH01M4/661H01M4/663H01M4/667H01M4/1395H01M4/045H01M4/0483H01M10/052Y02E60/10
Inventor 张乃庆田达范立双
Owner HARBIN INST OF TECH
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