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A kind of preparation method of lithium foil

A technology of lithium foil and carbon nanotubes, applied in structural parts, filament/wire forming, negative electrodes, etc., can solve the problems of unseen commercial applications, lithium dendrites piercing the diaphragm, uneven deposition, etc., to achieve inhibition Generation of dead lithium, excellent cycle performance, and the effect of inhibiting lithium dendrites

Active Publication Date: 2021-11-09
JINGMEN YIMEI IND DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the metal lithium negative electrode has a very high theoretical specific capacity (3861mAh / g), it can increase the energy density of the battery when used as a lithium battery negative electrode, but it is different from the lithium ion intercalation and extraction process in the graphite sheet when the graphite negative electrode is charged and discharged. The process of chemical deposition and dissolution of lithium occurs during charging and discharging of lithium metal negative electrode. This deposition and dissolution process will bring about a considerable volume change, and uneven deposition will occur, resulting in lithium dendrites piercing the separator, resulting in short circuit accident
Therefore, although lithium metal anodes have been extensively studied, their commercial applications have not yet been seen.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of lithium foil, comprising the steps of:

[0030] (1) Acidification of carbon nanotubes: add carbon nanotubes to mixed acid, heat to 70°C, keep warm for 2 hours, filter, wash and dry to obtain acidified carbon nanotubes, and the mixed acid is mixed with concentrated nitric acid and concentrated sulfuric acid made;

[0031] (2) Preparation of spinning solution: adding the acidified carbon nanotubes in step (1) into the polyacrylonitrile solution, and ultrasonically dispersing to obtain a spinning solution for later use;

[0032] (3) Spinning to form a film: Electrospinning the spinning solution obtained in step (2) to obtain a nanofiber film;

[0033] (4) Carbonization: carbonizing the nanofiber membrane to obtain a carbon nanofiber membrane;

[0034] (5) Electrodeposition: the lithium foil is obtained by using the carbon nanofiber film as the cathode and the lithium metal sheet as the anode by immersing in the electrolyte solution for electrodepo...

Embodiment 2

[0043] A preparation method of lithium foil, comprising the steps of:

[0044] (1) Acidification of carbon nanotubes: add carbon nanotubes to mixed acid, heat to 60°C, keep warm for 3 hours, filter, wash, and dry to obtain acidified carbon nanotubes. The mixed acid is mixed with concentrated nitric acid and concentrated sulfuric acid made;

[0045](2) Preparation of spinning solution: adding the acidified carbon nanotubes in step (1) into the polyacrylonitrile solution, and ultrasonically dispersing to obtain a spinning solution for later use;

[0046] (3) Spinning to form a film: Electrospinning the spinning solution obtained in step (2) to obtain a nanofiber film;

[0047] (4) Carbonization: carbonizing the nanofiber membrane to obtain a carbon nanofiber membrane;

[0048] (5) Electrodeposition: the lithium foil is obtained by using the carbon nanofiber film as the cathode and the lithium metal sheet as the anode by immersing in the electrolyte solution for electrodepositi...

Embodiment 3

[0057] A preparation method of lithium foil, comprising the steps of:

[0058] (1) Acidification of carbon nanotubes: add carbon nanotubes to mixed acid, heat to 80°C, keep warm for 1 hour, filter, wash and dry to obtain acidified carbon nanotubes, and the mixed acid is mixed with concentrated nitric acid and concentrated sulfuric acid made;

[0059] (2) Preparation of spinning solution: adding the acidified carbon nanotubes in step (1) into the polyacrylonitrile solution, and ultrasonically dispersing to obtain a spinning solution for later use;

[0060] (3) Spinning to form a film: Electrospinning the spinning solution obtained in step (2) to obtain a nanofiber film;

[0061] (4) Carbonization: carbonizing the nanofiber membrane to obtain a carbon nanofiber membrane;

[0062] (5) Electrodeposition: the lithium foil is obtained by using the carbon nanofiber film as the cathode and the lithium metal sheet as the anode by immersing in the electrolyte solution for electrodepos...

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Abstract

The invention relates to the technical field of lithium foil, in particular to a preparation method of lithium foil, comprising the following steps: (1) carbon nanotube acidification; (2) preparation of spinning solution; (3) spinning into film; (4) Carbonization; (5) Electrodeposition. The present invention uses a three-dimensional carbon nanofiber film as a matrix, and deposits lithium powder on the carbon nanofiber film by electrodeposition. Compared with a conventional lithium foil, the impedance of the SEI film on the surface is significantly reduced, and the lithium battery using the matrix as a negative electrode has high Energy density and excellent cycle performance; in addition, the present invention mixes carbon nanotubes in the carbon nanofiber film, and the carbon nanotube is embedded in the network structure of the carbon nanofiber film, and the current uniformity of the carbon nanofiber film is improved during electrodeposition to realize lithium The uniform deposition of carbon nanofiber film can effectively suppress the generation of lithium dendrites and dead lithium as a negative electrode of lithium batteries.

Description

technical field [0001] The invention relates to the technical field of lithium foil, in particular to a preparation method of lithium foil. Background technique [0002] Lithium-ion battery is a rechargeable battery composed of positive electrode, negative electrode, separator and electrolyte or electrolyte. It is widely used in mobile communication equipment, notebook computers, digital Electronic products such as cameras, and gradually play a role in the field of electric vehicles and energy storage. At present, graphite is mostly used as the anode material of lithium-ion batteries. Due to the limited theoretical specific capacity of graphite, as the market demands higher and higher energy density of batteries, metallic lithium anodes have been extensively studied as a negative electrode with high theoretical specific capacity. [0003] Although the metal lithium negative electrode has a very high theoretical specific capacity (3861mAh / g), it can increase the energy densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62D04H1/728D01D5/00
CPCD01D5/0015D04H1/728H01M4/362H01M4/382H01M4/583H01M4/625H01M2004/027Y02E60/10
Inventor 许厚成
Owner JINGMEN YIMEI IND DESIGN CO LTD
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