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Lithium metal battery negative electrode and preparation method and application thereof

A lithium metal battery and negative electrode technology, which is applied in the field of lithium metal battery negative electrode and its preparation, can solve problems such as difficult to improve and low ion conductivity, and achieve the effects of improved cycle life, low charge density, and uniform charge distribution

Pending Publication Date: 2022-05-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3) Solid electrolyte: The ionic conductivity of solid electrolyte is low, and it is generally difficult to improve;

Method used

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  • Lithium metal battery negative electrode and preparation method and application thereof
  • Lithium metal battery negative electrode and preparation method and application thereof
  • Lithium metal battery negative electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A lithium metal battery negative pole, its preparation method comprises the following steps:

[0037] 1) Add 0.4g of bacterial cellulose (PBC) to 300mL of zinc acetate solution with a concentration of 0.1mol / L, sonicate for 30min, dry to remove the solvent, and then place it in a nitrogen atmosphere for calcination at 500°C for 3h to obtain nanoparticles loaded with zinc oxide The porous carbon matrix (denoted as PBC-ZnO);

[0038] 2) The porous carbon matrix loaded with zinc oxide nanoparticles was calcined in an ammonia atmosphere at 400 °C for 3 h to obtain a three-dimensional current collector (denoted as PBC-ZnO-NH 3 );

[0039] 3) Composite 0.001g of the three-dimensional current collector and 0.03g of metal lithium through a melting method to obtain the negative electrode of the lithium metal battery.

[0040] Performance Testing:

[0041] 1) PBC-ZnO-NH in the present embodiment 3 The scanning electron microscope (SEM) image of figure 1 shown.

[0042] Depe...

Embodiment 2

[0048] A lithium metal battery negative pole, its preparation method comprises the following steps:

[0049] 1) Add 0.4 g of bacterial cellulose to 300 mL of zinc nitrate solution with a concentration of 0.1 mol / L, sonicate for 30 min, dry to remove the solvent, and place in a nitrogen atmosphere for calcination at 500°C for 3 h to obtain porous carbon loaded with zinc oxide nanoparticles matrix;

[0050] 2) Calcining the porous carbon matrix loaded with zinc oxide nanoparticles in an ammonia atmosphere at 500°C for 3 hours to obtain a three-dimensional current collector;

[0051] 3) Composite 0.001g of the three-dimensional current collector and 0.03g of metal lithium through a melting method to obtain the negative electrode of the lithium metal battery.

[0052] Performance Testing:

[0053] 1) Through SEM testing, it is found that the morphology of the three-dimensional current collector in this example is highly similar to the three-dimensional current collector in Example...

Embodiment 3

[0056] A lithium metal battery negative pole, its preparation method comprises the following steps:

[0057] 1) Add 0.4 g of bacterial cellulose to 300 mL of zinc nitrate solution with a concentration of 0.2 mol / L, sonicate for 60 min, dry to remove the solvent, and place in a nitrogen atmosphere for calcination at 500°C for 2 h to obtain porous carbon loaded with zinc oxide nanoparticles matrix;

[0058] 2) Calcining the porous carbon matrix loaded with zinc oxide nanoparticles in an ammonia atmosphere at 400°C for 3 hours to obtain a three-dimensional current collector;

[0059] 3) Composite 0.001g of the three-dimensional current collector and 0.03g of metal lithium through a melting method to obtain the negative electrode of the lithium metal battery.

[0060] Performance Testing:

[0061] 1) Through SEM testing, it is found that the morphology of the three-dimensional current collector in this example is highly similar to the three-dimensional current collector in Examp...

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Abstract

The invention discloses a lithium metal battery negative electrode and a preparation method and application thereof. The lithium metal battery negative electrode comprises a three-dimensional current collector and metal lithium, the three-dimensional current collector comprises a porous matrix and loaded lithium-loving particles, and the porous matrix is formed by interweaving nitrogen-doped carbon fibers. The lithium-philic particles are metal elementary substance nano-particles or metal alloy nano-particles or metal compound nano-particles formed by at least one of zinc, silver, gold, cobalt, molybdenum and magnesium. The preparation method of the negative electrode of the lithium metal battery comprises the following steps: 1) preparing a porous carbon matrix loaded with lithium-loving particles; 2) preparing a three-dimensional current collector; and 3) compounding the three-dimensional current collector and metal lithium. The negative electrode of the lithium metal battery can effectively adjust the growth of lithium dendrites and reduce the generation of dead lithium, so that the cycling stability, coulombic efficiency and safety performance of the lithium metal battery assembled by the negative electrode can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a lithium metal battery negative electrode and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of portable electronic products and electric vehicles, people have higher and higher requirements for the energy density of lithium batteries, and it is urgent to develop electrode materials with high capacity and suitable working voltage. The lithium metal anode has a very high theoretical capacity (3860mAh / g) and the most negative potential (-3.040V vs standard hydrogen electrode), known as the "Holy Grail" electrode, which has attracted great attention from researchers. However, due to the low surface energy and high diffusion barrier of lithium metal, it is easy to cause the growth of dendrites, which will intensify the side reactions, increase the volume expansion of the electrode and the polari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M10/052Y02E60/10
Inventor 宋慧宇刘美玲陶梦丽
Owner SOUTH CHINA UNIV OF TECH
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