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Preparation method of lithium foil

A technology of lithium foil and carbon nanotubes, applied in the direction of negative electrodes, electrical components, non-woven fabrics, etc., can solve the problems of unseen commercial applications, lithium dendrites piercing the diaphragm, uneven deposition, etc., and achieve uniform conductivity Performance, improvement of current uniformity, and uniform deposition effect

Active Publication Date: 2019-09-03
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 foils, in particular to a preparation method of a lithium foil. The preparation method of the lithium foil comprises the following steps of: (1)acidifying a carbon nano tube; (2) preparing a spinning solution; (3) performing spinning to form a film; (4) performing carbonizing; (5) performing electrodeposition. According to the invention, a three-dimensional carbon nanofiber membrane is used as a matrix, lithium powder is deposited on the carbon nanofiber membrane through electrodeposition, the impedance of a surface SEI membrane is obviously reduced compared with that of a conventional lithium foil, and the lithium battery by using the matrix as an anode has high energy density and an excellent cycle performance; in addition, the carbon nano tube is mixed into the carbon nanofiber membrane and is inlaid in the network structure of the carbon nanofiber membrane, so that the current uniformity of the carbon nanofiber membrane is improved during electrodeposition, and the uniform deposition of lithium on the carbon nanofiber membrane is achieved, so that the carbon nanofiber membrane can be used as the anode of a lithium batteryto effectively inhibit the generation of lithium dendrites and dead lithium.

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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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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