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Lithium metal anode and preparation method thereof

A lithium metal anode and lithium metal technology, applied in the direction of non-metallic elements, chemical instruments and methods, negative electrodes, etc., can solve the problems of low coulombic efficiency, high risk of battery failure, capacity loss, etc., to reduce the current density and strengthen the skeleton , the effect of preventing reunion

Pending Publication Date: 2022-07-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And these problems eventually lead to capacity loss, low Coulombic efficiency and high risk of battery failure

Method used

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  • Lithium metal anode and preparation method thereof
  • Lithium metal anode and preparation method thereof
  • Lithium metal anode and preparation method thereof

Examples

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preparation example Construction

[0056] Please refer to figure 1 , the embodiment of the present invention provides a preparation method of a lithium metal anode, comprising:

[0057] Step 1, preparing a carbon nanotube raw material, the carbon nanotube raw material is obtained by scraping directly from a carbon nanotube array;

[0058] Step 2, adding the carbon nanotube raw material to an organic solvent, and ultrasonically oscillating to form a flocculent structure;

[0059] Step 3, washing the flocculent structure with water;

[0060] Step 4: freeze-drying the washed flocculent structure in a vacuum environment to obtain a carbon nanotube sponge preform;

[0061] Step 5, carrying out carbon deposition on the carbon nanotube sponge preform to form a carbon deposit layer to obtain the carbon nanotube sponge;

[0062] In step 6, the molten lithium is placed in contact with the carbon nanotube sponge in an oxygen-free atmosphere, and the molten lithium is thermally injected into the carbon nanotube sponge and...

Embodiment 1

[0088] Provide a super-aligned carbon nanotube array, the carbon nanotubes in the carbon nanotube array have a diameter of 20 nanometers and a length of 300 micrometers; scrape 100 mg of carbon nanotube arrays, add them to 100 milliliters of ethanol and 100 milliliters In the ionized water mixture, the ultrasonic wave with a power of 400 watts was ultrasonically stirred for 30 minutes to form a floc structure; the floc structure was washed with water; the washed floc structure was placed in a freeze dryer, and quenched to -30°C, freeze for 12 hours; then raise the temperature to -10°C, evacuate to 10Pa, dry for 12 hours, then close the vacuum system, open the air inlet valve of the freeze dryer, take out the sample, and obtain the carbon nanotube sponge Preform; transfer the carbon nanotube sponge preform into a reactor, pass acetylene (flow rate of 10sccm) and argon, and heat to 800 ° C to decompose the acetylene, and carry out carbon nanotube sponge preform in the carbon nano...

Embodiment 2

[0100] Symmetric cells were assembled in a glove box (M. Braun Inert Gas Systems GmbH, Germany) under an argon atmosphere. The working electrode and the counter electrode of the symmetrical cell are lithium metal anodes. 1M LiPF6 with 2 wt% VC in EC:DMC:DEC (1:1:1:1 by volume) was used as electrolyte.

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Abstract

A lithium metal anode comprises a carbon nano tube sponge and a lithium metal material, the carbon nano tube sponge comprises a plurality of carbon nano tubes and a plurality of micropores, the surfaces of the carbon nano tubes are coated with carbon deposition layers, and the micropores are formed by the carbon nano tubes with the surfaces coated with the carbon deposition layers. And the lithium metal material is filled in the plurality of micropores and coats the carbon nanotubes coated by the carbon deposition layer. The invention also relates to a preparation method of the lithium metal anode.

Description

technical field [0001] The invention relates to a lithium metal anode and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, portable electronic devices, etc. The negative electrode of the conventional lithium-ion battery is graphite, and the theoretical capacity is 372mAh g -1 , unable to meet the growing demand for higher lithium-ion battery capacity. Due to its high theoretical capacity of 3860 mAh g-1 and low redox potential of -3.04 V, lithium metal anodes are considered to be the "holy grail" electrodes for next-generation rechargeable batteries. [0003] However, existing lithium metal anodes have some problems that hinder their practical application. Li deposition during cycling is non-uniform, and non-uniform deposition will lead to the growth of lithium dendrites. The chemical reaction between lithium and the liquid electrolyte constitutes a solid electrolyte interface (SEI) on the lithium met...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M4/1395H01M10/0525C01B32/168
CPCH01M4/362H01M4/382H01M4/62H01M4/628H01M4/134H01M4/1395H01M10/0525C01B32/168Y02E60/10H01M4/808H01M4/663H01M10/052H01M2004/027C01B32/174C01P2006/10
Inventor 王菁王佳平范守善
Owner TSINGHUA UNIV
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