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Ultra-thin metal lithium complex, preparation method and application thereof

A technology of ultra-thin metals and composites, applied in the field of electrochemistry, can solve the problems of high cost and unfavorable large-scale preparation, and achieve the effects of improving performance, being suitable for large-scale applications, and having a high degree of practicality

Active Publication Date: 2019-06-11
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The various transition layers that have been reported so far are all inorganic coatings, and most of the preparation processes require nano-growth preparation technologies, such as CVD deposition or atomic layer deposition, which are not only costly but also unfavorable for large-scale preparation.

Method used

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  • Ultra-thin metal lithium complex, preparation method and application thereof
  • Ultra-thin metal lithium complex, preparation method and application thereof
  • Ultra-thin metal lithium complex, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, prepare ultra-thin lithium metal on foamed copper metal substrate

[0038] Weigh 5g rosin resin, dissolve it in 95g ethanol to form a uniform rosin solution, soak the copper foam in the rosin solution for 1 minute, remove the ethanol solvent and fully dry it, and form a uniform transition layer on the surface of the foam copper. The sample was moved into a glove box filled with argon, in which the water and oxygen values ​​were all ≤0.1ppm. Put lithium metal into a stainless steel container and heat it to 250°C and keep it warm to form molten lithium. The copper foam with transition layer and molten lithium are contacted for 20s. The results show that after the contact between foam copper with transition layer and molten metal lithium, the melting Lithium rapidly spreads on its surface to form a relatively uniform ultra-thin layer of lithium, such as figure 1 . From figure 1 It can be seen that the area of ​​lithium metal layer that can be obtained at o...

Embodiment 2

[0041] Embodiment 2, prepare ultra-thin lithium metal on carbon felt

[0042] Weigh 10g of citric acid, dissolve it in 90g of ethanol to form a uniform citric acid solution, soak the carbon felt in the citric acid solution for 1 minute, remove the ethanol solvent and fully dry it, forming a uniform transition layer on the surface of the carbon felt , Move the sample into a glove box filled with argon, in which the values ​​of water and oxygen are less than 0.1ppm. Put lithium metal into a stainless steel container and heat it to 250°C and keep it warm to form molten lithium. The carbon felt with transition layer is in contact with molten lithium for 20 seconds. The results show that after the sample with transition layer contacts with molten lithium metal, the molten lithium Spread quickly on its surface to form a relatively uniform thin layer of lithium, such as Figure 4A shown.

[0043] Analyze and confirm the crystal structure of product with powder X-ray diffractometer ...

Embodiment 3

[0047] Embodiment 3, preparation is immersed in the lithium metal layer inside carbon felt

[0048] Weigh 30g of citric acid, dissolve it in 70g of water to form a uniform citric acid solution, soak the carbon felt in the citric acid solution for 1 minute, remove the solvent and fully dry it, forming a uniform layer on the surface of the carbon felt and the internal pore wall. The transition layer, the sample is moved into a glove box filled with argon, in which the values ​​of water and oxygen are less than or equal to 0.1ppm. Put lithium metal into a stainless steel container and heat it to 250°C and keep it warm to form molten lithium. The carbon felt with a transition layer is in contact with the molten lithium for 20 seconds. The results are as follows: Figure 7 As shown, the molten metal lithium is immersed in the carbon felt, and the surface capacity is high, which can be as high as 30mAh / cm 2 , to form a symmetrical battery with a commercial lithium sheet, and measur...

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Abstract

The invention discloses an ultra-thin metal lithium complex, a preparation method and application thereof. The method comprises the following steps: an organic transition layer is prepared on a substrate in advance, under an argon protective atmosphere with the water value less than or equal to 0. 1 ppm and the oxygen value less than or equal to 0. 1 ppm, the substrate with the transition layer isin contact with molten-state lithium, and the molten-state metal lithium is rapidly spread on the surface of the substrate to form a lithium thin layer. The ultra-thin metal lithium can be pre-storedon a current collector in advance, can be used as a safe lithium negative electrode for inhibiting lithium dendrites and can also be used for a negative electrode lithium supplementing process, and also, extremely controllable preparation of the ultra-thin lithium layer can be realized by means of a patterned design of the transition layer on the substrate.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method and application of ultra-thin metal lithium. Background technique [0002] The rapid development of portable electronic devices and electric vehicles has put forward higher and higher requirements for the performance of lithium-ion batteries in the energy storage link. Lithium metal has a very high theoretical capacity (3860mA h g -1 ) and the lowest redox standard electrode potential have attracted the attention of battery researchers, and have become a research hotspot for the next generation of secondary batteries. The main obstacles in the commercialization of lithium metal negative electrodes are the uneven deposition of lithium and the side reactions between lithium metal and electrolyte, especially the lithium dendrites caused by the uneven deposition of lithium not only lead to a decrease in the coulombic efficiency of the battery, but als...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/134H01M10/052
CPCH01M4/134H01M4/1395H01M10/052Y02E60/10H01M4/382H01M4/0404H01M4/0483H01M4/62H01M4/661H01M4/663H01M4/664H01M4/808H01M4/806H01M4/80H01M2004/021H01M4/0471H01M2004/027H01M4/0416
Inventor 郭玉国王书华董为殷雅侠王春儒
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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