A three-dimensional metal lithium negative electrode and its preparation method and application

A metal lithium, three-dimensional technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of increasing manufacturing cost and complexity, reducing the electronic conductivity of the main 3D skeleton, and achieving high rate performance and long cycle life , the effect of long-term cycle stability

Active Publication Date: 2021-09-24
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating process increases fabrication cost and complexity, and may reduce the electronic conductivity at the Li interface of the host 3D framework

Method used

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  • A three-dimensional metal lithium negative electrode and its preparation method and application
  • A three-dimensional metal lithium negative electrode and its preparation method and application
  • A three-dimensional metal lithium negative electrode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The three-dimensional copper foam was immersed in 2M NaOH solution and 0.1M (NH 4 ) 2 S 2 o 8 15 minutes in the mixture to form 3DCu(OH) 2 nanowire structure. After rinsing with deionized water and drying in a vacuum oven for 12 h, the 3D Cu(OH) 2 The foam is cut into discs. It was then placed in a tube furnace and heated to 180 °C under Ar flow for 2 h, then washed with 10% H 2 The airflow raised the temperature by 265 °C for 3.5 h. After allowing the tube furnace to cool down to room temperature, the resulting 3D CuNWs were quickly transferred into an argon-filled glove box. For the lithium infusion process, the Li foil was placed in a stainless steel container and heated to 350 °C. The 3D CuNWs are placed in contact with molten Li, where Li is injected into the structure to form the final 3D Li@CuLi electrode. Lithium melting process control time is less than 20 seconds.

Embodiment 2

[0040] Metal copper is sputtered on the three-dimensional copper foam by magnetron sputtering. The sputtering time is controlled to obtain nano-copper thin layers with different thicknesses. The Li foil was then placed in a stainless steel container and heated to 350 °C. The 3D Cu electrode is then placed in contact with the molten Li, where the Li is injected into the structure to form the final 3D Li@CuLi electrode. Lithium melting process control time is less than 20 seconds.

experiment example 1

[0042] The schematic diagram of the three-dimensional framework structure modified by metal nanowires and the principle of melting lithium is shown in figure 1 A (different stages of electrode fabrication) is shown. figure 1 B is the injection of molten Li into 3D CuNW electrodes within 20 s. Inject molten Li directly into the three-dimensional copper foam without infiltration, see figure 1 c.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a three-dimensional metal lithium negative electrode and a preparation method and application thereof. The three-dimensional metallic lithium negative electrode includes a three-dimensional foamed copper framework, and metallic copper nanowires are grown on the surface of the foamed copper. Using copper nanowires to modify the three-dimensional (3D) foamed copper framework, a "lithophilic" surface is obtained, thereby melting metal lithium into the metal framework, and realizing a three-dimensional metal lithium anode. In addition, in the process of melting lithium, metal lithium will react with copper to form Li-Cu alloy. The invention can suppress the formation of dendrite lithium in the metal lithium negative electrode, and realize the stable circulation of the metal lithium negative electrode. Compared with conventional metal lithium sheets, the invention can make the metal lithium battery have better cycle stability and higher rate performance. It is of great value to realize the commercial application of metal lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a three-dimensional lithium-friendly skeleton structure used for metal lithium negative electrode protection. Background technique [0002] With the rapid development of battery vehicles and large-scale energy storage systems, the development of lithium batteries with high energy density has received extensive attention. Due to the high theoretical specific capacity (3680mAh / g) and low electrochemical potential (-3.040vs SHE) of the metal lithium negative electrode, the lithium battery (metal lithium battery) using metal lithium as the negative electrode has a high energy density. It has broad application prospects in electric vehicles and large-scale energy storage systems. However, due to the presence of dendrite lithium in metal lithium anodes, the huge volume change and other problems hinder its commercial application. [0003] To address the risk ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/66H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/661H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 孙学良科甘·亚岱尔王长虹赵阳卢世刚张立赵尚骞
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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