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A kind of composite lithium metal negative electrode and its preparation method and application

A metal negative electrode and composite lithium technology, which is applied in electrode manufacturing, electrode rolling/calendering, battery electrodes, etc., can solve the problems of lack of preparation methods for composite lithium metal negative electrodes, achieve excellent cycle stability, inhibit the growth of dendrites, The effect of good affinity

Active Publication Date: 2022-02-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical solution applies monoaryl silane to the surface of the lithium metal layer so that a protective interfacial layer comprising an ordered stack of monomolecular layers is formed above the main surface of the lithium metal layer, but dendrites grow in the lithium metal negative electrode problems still exist
[0005] Therefore, the prior art still lacks a method for preparing a composite lithium metal negative electrode capable of inhibiting dendrite growth.

Method used

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  • A kind of composite lithium metal negative electrode and its preparation method and application
  • A kind of composite lithium metal negative electrode and its preparation method and application
  • A kind of composite lithium metal negative electrode and its preparation method and application

Examples

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Effect test

Embodiment 1

[0034] A composite lithium metal negative electrode, such as figure 1 As shown, it is prepared by the following method:

[0035] (1) The silver nanowire ink having a concentration of 0.5 mg / ml is prepared, and the diameter is 12mm. The copper network is 200 destination, then the copper net is immersed in 200 μL of silver nanowire ink, soaked for 5 seconds, take it out Drying treatment in an oven at 40 ° C, which is made of copper networks loaded with silver nanowires;

[0036] (2) In the argon atmosphere conditions, the copper network loaded with silver nanowires is paved on the metal lithium foil, and then the two are placed in the roller press to carry out the roller pressure, remove the copper web, to obtain recombination lithium Metal negative electrode.

Embodiment 2

[0038]The present embodiment is mainly different from the first embodiment in that the concentration of the silver nanowire ink and the objective number of the copper network are different, as described below.

[0039] A composite lithium metal negative electrode, prepared by the following method:

[0040] (1) First formulate silver nanowire ink having a concentration of 2 mg / ml, preparing a diameter of 12mm and a copper network of 300 destination, then impiltrate the stainless steel net into 200 μL of silver nanowire ink, soak 5 seconds, take it out to 50 Drying treatment in ° C oven, resulting in a stainless steel net with silver nanowire;

[0041] (2) In the argon atmosphere conditions, the stainless steel nets loaded with silver nanowires are paved on the metal lithium foil, and then the two are placed in the roller press for rolling, and the stainless steel net can be obtained. Metal negative electrode.

Embodiment 3

[0043] The present embodiment is mainly different from the first embodiment in that the concentration of the silver nanowire ink and the objective number of the copper network are different, as described below.

[0044] A composite lithium metal negative electrode, prepared by the following method:

[0045] (1) The silver nanowire ink having a concentration of 3.5 mg / ml is prepared, and the diameter is 12mm and a copper net of 400 destination, then the copper net is immersed in 200 μL of silver nanowire ink, soak for 5 seconds, take it out Drying treatment in an oven at 60 ° C, and the copper network having a silver nanowire is made;

[0046] (2) In the argon atmosphere conditions, the stainless steel net of the silver nanowire is paved on the metal lithium foil, and then the two are placed in the roller press for rolling, and the copper web can be obtained. Metal negative electrode.

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Abstract

The invention belongs to the field of secondary lithium metal batteries, and more specifically relates to a composite lithium metal negative electrode and a preparation method thereof. The preparation method of the present invention comprises the following steps: (1) preparing conductive metal nanowire ink, immersing a metal mesh in the metal nanowire ink, taking out the metal mesh and drying to obtain a metal mesh loaded with conductive metal nanowire; 2) placing the metal mesh loaded with the conductive metal nanowires flat on the metal lithium foil, rolling by a roller press, and removing the metal mesh to obtain a composite lithium metal negative electrode. In the present invention, the metal mesh is used to press the array channel pattern on the metal lithium foil. On the one hand, the mechanical strength of the metal mesh is greater than that of lithium, and it is easy to carry out effective rolling to construct the channel. Compared with the flat lithium foil, the obtained composite lithium metal negative electrode has extremely Low polarization voltage and excellent cycle stability have great application value in the field of lithium metal secondary batteries.

Description

Technical field [0001] The invention belongs to the field of secondary lithium metal cells, and more particularly to a composite lithium metal negative electrode and its preparation method thereof. Background technique [0002] Based on the metal-lithium secondary battery has been put into the motor vehicle, laptop and mobile phone and other markets, however, electric cars are in a hot and mobile phone explosion, but it is often uncommon, which is mainly caused by unstable lithium metal negatives in the charging and discharge process. Metal lithium is a very lively metal of chemical properties. It is extremely easily generated in the charge and discharge process to generate metal lithium dendrites, and the lacege crystals that continue to grow will pierce the diaphragm, resulting in short circuit inside the battery, which may cause serious safety. Issue, and the sediment growth of metal lithium dendrites causes huge volume expansion and negative electrode powder, affecting the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/04H01M4/134H01M10/0525
CPCH01M4/1395H01M4/0435H01M4/134H01M10/0525Y02E60/10
Inventor 黄云辉王华李真袁利霞
Owner HUAZHONG UNIV OF SCI & TECH
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