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Three-dimensional metal lithium negative electrode and preparation method and application thereof

A lithium metal, three-dimensional technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of reducing the electronic conductivity of the main 3D framework, increasing the manufacturing cost and complexity, achieving high rate performance, and solving dendrites. Effects of lithium formation, long cycle life

Active Publication Date: 2019-07-26
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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  • Three-dimensional metal lithium negative electrode and preparation method and application thereof
  • Three-dimensional metal lithium negative electrode and preparation method and application thereof
  • Three-dimensional metal lithium negative electrode and preparation method and application thereof

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 vessel 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 present invention belongs to the technical field of lithium ion batteries, and particularly relates to a three-dimensional metal lithium negative electrode and a preparation method and an application thereof. The three-dimensional metal lithium negative electrode comprises a three-dimensional copper foam framework. Metal copper nanowires grow on the surface of the copper foam. By modifying thethree-dimensional (3D) copper foam framework with the copper nanowires, a surface with lithium affinity is obtained, thereby metal lithium is melted into the metal framework and the three-dimensionalmetal lithium negative electrode is realized. In addition, in the process of melting lithium, metal lithium reacts with copper to form Li-Cu alloy. The invention can inhibit the formation of dendritic lithium in the metal lithium negative electrode, and realizes a stable cycle of the metal lithium negative electrode. Compared with the conventional metal lithium plate, the present invention makesthe metal lithium battery have better cycle stability and higher rate performance, and is of great value for realizing 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 Applications(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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