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Alkali metal surface in-situ treatment method and application thereof in secondary battery

An in-situ processing, metal technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of difficult application and high production cost, achieve continuous cracking and repair, solve safety problems, and improve ion channels. Effect

Active Publication Date: 2019-04-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the local high-concentration electrolyte contains a large amount of lithium salt, the production cost is too high, and it is difficult to apply it in actual production

Method used

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  • Alkali metal surface in-situ treatment method and application thereof in secondary battery
  • Alkali metal surface in-situ treatment method and application thereof in secondary battery
  • Alkali metal surface in-situ treatment method and application thereof in secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0052] In a high-purity argon atmosphere, immerse the polished lithium sheet in dimethyl sulfoxide solution containing 0.05M tin tetrachloride for 5 minutes and react at a temperature of 20°C. Put the lithium sheet in pure 1,4-diox The hexacyclic solution was washed and allowed to evaporate. The composite film with polyepoxy polymer / alloy phase of the present invention can be obtained. Such as figure 1 Shown is the scanning electron microscope image of the processed lithium sheet. It can be seen from the image that the thickness of the composite film formed is about 10 μm.

[0053] The above-mentioned lithium sheet with a protective film and the separator were assembled into a lithium-lithium symmetrical button cell in an argon-protected glove box, and the concentration of 1M bistrifluoromethanesulfonylimide lithium and 1% mass concentration of lithium nitrate were added. , 3-dioxolane and ethylene glycol dimethyl ether (volume ratio of 1:1) electrolyte.

[0054] Assemble t...

Embodiment 2

[0056] Other conditions are the same as in Example 1, except that the concentration of the treatment solution is 0.1M.

[0057] The button battery was assembled and tested in the same manner as in Example 1.

Embodiment 3

[0059] Other conditions are the same as in Example 1, except that the treatment liquid solute is tin dichloride.

[0060] The button battery was assembled and tested in the same manner as in Example 1.

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Abstract

The invention belongs to the field of energy storage batteries and more particularly to an alkali metal surface in-situ treatment method and application thereof in a secondary battery. The method protects the metal by in-situ treatment of an alkali metal sheet. A metal pole piece prepared by the method can be used for a high specific energy alkali metal secondary battery. The metal sheet obtainedby the method is prepared by generating a protective film on the surface of the metal based on a reaction of a treatment liquid having a small amount of metal salt with the surface of an alkali metalnegative electrode. The protective film is an organic / inorganic mixture having a mosaic-like solid electrolyte structure. The method is simple, easy to control, practical and economical. The alkali metal sheet is used for a secondary alkali metal negative electrode battery, can greatly improve the energy density and the cycle life of the alkali metal battery, and improve the performance of the alkali metal secondary battery, and has great application prospects.

Description

technical field [0001] The invention belongs to the field of energy storage batteries, and more specifically relates to an in-situ treatment method for alkali metal surfaces and its application in secondary batteries. Background technique [0002] With the emergence of energy crisis and environmental problems, new energy technologies have been fully developed. Among them, the demand for high-performance energy storage devices with high specific energy is increasing, and the current lithium-ion secondary batteries cannot meet the needs of electric vehicles, portable electronic devices, and energy storage conversion devices. Therefore, the exploration of high specific energy electrochemical energy storage systems such as lithium-sulfur, lithium-air, potassium, and sodium-ion batteries has been spawned. Among them, the use of pure metals as negative electrodes for such energy storage systems has obvious advantages, such as: metal lithium Because it has a higher specific capaci...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/134
CPCH01M4/134H01M4/366H01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 谢佳金留姜智鹏曾子琪孙玉龙
Owner HUAZHONG UNIV OF SCI & TECH
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