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High-stability long-service-life metal lithium negative electrode material as well as preparation method and application thereof

A negative electrode material, metal lithium technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of large pollution and complexity, and achieve the effects of good conductivity, accelerated electrochemical kinetics, and good fluidity

Active Publication Date: 2020-10-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors have found that these methods often have problems such as complexity and large pollution

Method used

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  • High-stability long-service-life metal lithium negative electrode material as well as preparation method and application thereof
  • High-stability long-service-life metal lithium negative electrode material as well as preparation method and application thereof
  • High-stability long-service-life metal lithium negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation of a highly stable and long-life metal lithium negative electrode material comprises the following steps:

[0046] (1) Take the fresh lithium sheet out of the argon inert atmosphere and place it in a dry air atmosphere at room temperature (about 25°C).

[0047] (2) Clean the oil and impurities on the surface of the lithium sheet in step (1) with a dry paper towel.

[0048] (3) Quickly and evenly coat a layer of gallium indium tin zinc liquid metal (melting point 3 ℃) on the upper and lower surfaces of the cleaned lithium sheet with a clean small brush, and the loading capacity is 1 mg / cm 2 ,Such as Figure 1-3 shown.

[0049](4) Put the liquid metal-coated lithium sheet in step (3) into an argon inert atmosphere quickly, carry out an alloying reaction at a reaction temperature of 25° C., and the reaction time is 24 hours to obtain the highly stable and long-lived lithium metal anode materials such as Figure 4 and 5 shown.

[0050] (5) Use CR2032 b...

Embodiment 2

[0052] The preparation of a highly stable and long-life metal lithium negative electrode material comprises the following steps:

[0053] (1) Take the fresh lithium sheet out of the argon inert atmosphere and place it in a dry air atmosphere at room temperature (about 25°C).

[0054] (2) Clean the oil and impurities on the surface of the lithium sheet in step (1) with a dry paper towel.

[0055] (3) Quickly and evenly coat a layer of gallium indium tin liquid metal (melting point 5°C) on the upper and lower surfaces of the cleaned lithium sheet with a clean small brush, and the loading capacity is 1 mg / cm 2 .

[0056] (4) Put the liquid metal-coated lithium sheet in step (3) into an argon inert atmosphere quickly, carry out an alloying reaction at a reaction temperature of 25° C., and the reaction time is 24 hours to obtain the highly stable and long-lived lithium metal Negative material.

[0057] (5) Use CR2032 button battery in 1M LiPF 6 -EC / EMC (volume ratio 1:1) liquid...

Embodiment 3

[0059] The preparation of a highly stable and long-life metal lithium negative electrode material comprises the following steps:

[0060] (1) Take the fresh lithium sheet out of the argon inert atmosphere and place it in a dry air atmosphere at room temperature (about 25°C).

[0061] (2) Clean the oil and impurities on the surface of the lithium sheet in step (1) with a dry paper towel.

[0062] (3) Use a clean small brush to quickly and evenly coat a layer of gallium-zinc liquid metal (melting point 25°C) on the upper and lower surfaces of the cleaned lithium sheet, with a loading capacity of 1 mg / cm 2 .

[0063] (4) Put the liquid metal-coated lithium sheet in step (3) into an argon inert atmosphere quickly, carry out an alloying reaction at a reaction temperature of 25° C., and the reaction time is 24 hours to obtain the highly stable and long-lived lithium metal Negative material.

[0064] (5) Use CR2032 button battery in 1M LiPF 6 -EC / EMC (volume ratio 1:1) liquid ele...

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Abstract

The invention relates to the technical field of lithium ion batteries, and particularly relates to a high-stability long-service-life metal lithium negative electrode material and a preparation methodthereof, and more particularly relates to a method for passivating the surface of metal lithium by utilizing low-temperature gallium-based liquid metal, reducing the reaction activity of the metal lithium and stabilizing a metal lithium negative electrode. The high-stability long-service-life lithium metal negative electrode material is lithium metal with an optimized lithium-based alloy passivation layer. The method comprises the steps of coating the surface of metal lithium with a layer of low-temperature gallium-based liquid metal, and then carrying out alloying reaction in an inert atmosphere so as to obtain the product. The low-temperature gallium-based liquid metal which is low in melting point, good in flowability, good in conductivity, lithium-friendly and non-toxic is used for coating the surface of the metal lithium with high reaction activity; and a lithium-based alloy passivation layer with good lithium affinity, corrosion resistance and high ion diffusion coefficient is formed on the surface of the metal lithium, so that the nucleation barrier of lithium is reduced, the electrochemical dynamics of an electrode interface is accelerated, the cycling stability of the metal lithium is improved, and the service life of the metal lithium is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a highly stable and long-life lithium metal negative electrode material and a preparation method thereof, and more specifically relates to a method of using low-temperature gallium-based liquid metal to passivate the surface of lithium metal to reduce its reactivity. Methods for stabilizing lithium metal anodes. 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] The rapid development of electric vehicles and grids places higher demands on battery systems. Traditional electrode materials need to be innovated. Lithium metal has high theoretical specific ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 冯金奎魏传亮
Owner SHANDONG UNIV
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