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Sodium battery current collector as well as preparation method and application thereof

A technology for current collectors and sodium batteries, which is applied to the coating of electrode collectors, batteries, battery electrodes, etc. It can solve the problems of electrode volume change limitations, unstable interfaces, and complicated methods, and achieve improved wettability and easy scale. The effect of chemical production and growth inhibition

Pending Publication Date: 2022-02-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as the growth of Na dendrites, unstable interfaces, and volume changes of electrodes limit the development and application of metal Na anodes.
At present, some strategies for modifying metal sodium anodes have been reported, but the inventors found that most of the strategies have problems such as complex methods, high toxicity, and high cost

Method used

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  • Sodium battery current collector as well as preparation method and application thereof
  • Sodium battery current collector as well as preparation method and application thereof
  • Sodium battery current collector as well as preparation method and application thereof

Examples

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preparation example Construction

[0030] A method for preparing a current collector of a sodium battery, comprising: coating a layer of gallium-based liquid metal at room temperature on the surface of metal aluminum, and then standing still for diffusion reaction to form an aluminum-gallium alloy layer on the surface of metal aluminum to obtain the current collector.

[0031] The sodium battery current collector prepared by the above preparation method comprises: metal aluminum and an aluminum-gallium alloy layer attached to the surface of the metal aluminum.

[0032] A highly stable sodium metal electrode, depositing a certain amount of sodium metal on the current collector by electrodeposition to form a sodium metal electrode.

[0033] The application of the above metal sodium electrode in the manufacture of sodium batteries, smart grids, electronic products, electric vehicles, and mobile energy storage equipment.

[0034] In some typical embodiments, the aluminum metal includes, but is not limited to: any o...

Embodiment 1

[0046] A preparation of a sodium battery current collector that inhibits the growth of sodium dendrites, comprising the steps of ( figure 1 ):

[0047] (1) Wipe the surface of the aluminum foil with absolute ethanol to remove impurities such as oil and dust. Its scanning electron microscope image is shown in figure 2 shown.

[0048] (2) Quickly apply a layer of GaInSnZn liquid metal on the surface of the cleaned aluminum foil with a small brush, and let it stand for 1 hour to react. Gallium loading on aluminum foil is 0.2mg / cm 2 . Its scanning electron microscope image is shown in image 3 shown.

[0049] (3) With the aluminum foil modified by GaInSnZn liquid metal as the current collector, and the metal sodium sheet as the counter electrode, assemble the CR2032 button cell in an inert atmosphere, and use 0.2mA / cm 2A current density of 2mAh / cm is deposited on the current collector 2 of sodium metal. Electrolyte is 1M NaPF 6 - EC / DEC (volume ratio 1:1) + 5% FEC. Its...

Embodiment 2

[0052] A preparation of a sodium battery current collector that inhibits the growth of sodium dendrites, comprising the steps of:

[0053] (1) Wipe the surface of the aluminum foil with absolute ethanol to remove impurities such as oil and dust.

[0054] (2) Quickly apply a layer of GaInSn liquid metal on the surface of the cleaned aluminum foil with a small brush, and let it stand for 1 hour to react. Gallium loading on aluminum foil is 0.2mg / cm 2 .

[0055] (3) Use the aluminum foil modified by GaInSn liquid metal as the current collector, and the metal sodium sheet as the counter electrode, assemble the CR2032 button battery in an inert atmosphere, and use 0.2mA / cm 2 A current density of 2mAh / cm is deposited on the current collector 2 of sodium metal. Electrolyte is 1M NaPF 6 - EC / DEC (volume ratio 1:1) + 5% FEC. The structure of the button cell includes positive electrode casing (stainless steel), negative electrode casing (stainless steel), gasket (stainless steel),...

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Abstract

The invention relates to a sodium battery current collector as well as a preparation method and application thereof. According to the method, the surface of an aluminum-based current collector is modified by using room-temperature gallium-based liquid metal, the wettability of the current collector to metal sodium is improved, the nucleation overpotential of sodium is reduced, and the growth of sodium dendrites is inhibited. The method comprises the following steps that: the surface of metal aluminum is coated with a layer of room-temperature gallium-based liquid metal; and liquid metal diffusion reaction is carried out, and the sodium battery current collector is obtained. According to the sodium battery current collector as well as the preparation method and application thereof of the invention, the gallium-based liquid metal is applied on the surface of the metal aluminum, and an aluminum gallium alloy layer with sodium affinity is spontaneously formed on the surface of the metal aluminum, so that the nucleation overpotential of the metal sodium is reduced, the growth of the sodium dendrites is inhibited, the cycling stability of a sodium battery is improved, the service life of the sodium battery is prolonged, and the coulombic efficiency of the sodium battery is improved.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a current collector of a sodium battery and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Na-ion batteries are considered to be one of the most promising new battery systems due to the widespread storage of sodium resources worldwide. Metal sodium is an excellent anode material for sodium ion batteries, which has the advantages of high theoretical specific capacity (1165mAh / g), low electrochemical potential (-2.37V), and good conductivity. However, problems such as the growth of Na dendrites, unstable in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/04H01M4/134H01M10/054
CPCH01M4/0404H01M4/667H01M4/661H01M4/662H01M4/0452H01M4/134H01M10/054H01M2220/20H01M2220/30Y02E60/10
Inventor 冯金奎魏传亮
Owner SHANDONG UNIV
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