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Al-Cu eutectic alloy electrode with lamellar structure, preparation method of Al-Cu eutectic alloy electrode and application of Al-Cu eutectic alloy electrode in water-based secondary aluminum ion battery

A eutectic alloy and lamellar technology, which is applied in the field of electrode materials for water-based secondary aluminum-ion batteries, can solve problems that restrict the development of water-based secondary aluminum-ion batteries, hydrogen evolution and passivation batteries, and failure, and achieve high electrochemical activity and structural stability, the effect of simple preparation method

Active Publication Date: 2021-11-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aluminum foil negative electrodes used in traditional aluminum-ion batteries are prone to hydrogen evolution and passivation in aqueous solution, making the batteries invalid, which greatly reduces the development of water-based secondary aluminum-ion batteries.
At the same time, in the long-term cycle, the aluminum foil anode will also show dendrite growth and serious self-discharge problems

Method used

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  • Al-Cu eutectic alloy electrode with lamellar structure, preparation method of Al-Cu eutectic alloy electrode and application of Al-Cu eutectic alloy electrode in water-based secondary aluminum ion battery
  • Al-Cu eutectic alloy electrode with lamellar structure, preparation method of Al-Cu eutectic alloy electrode and application of Al-Cu eutectic alloy electrode in water-based secondary aluminum ion battery
  • Al-Cu eutectic alloy electrode with lamellar structure, preparation method of Al-Cu eutectic alloy electrode and application of Al-Cu eutectic alloy electrode in water-based secondary aluminum ion battery

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Experimental program
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Effect test

Embodiment 1

[0030] The preparation process and steps in this embodiment are as follows:

[0031] A. Weigh 15g of pure aluminum block (Al, purity 99.994%) and 7.46g of pure copper block (Cu, purity 99.996%), and remove the surface oxide layer.

[0032] B. Put the two metals together into the smelting furnace for deoxidation treatment.

[0033] C. Heat to 1700°C for 2 minutes to ensure that the metal is completely melted and mixed evenly.

[0034] D. Use circulating water in the mold to rapidly cool the high-temperature liquid metal to room temperature at a speed of 300K / s.

[0035] E. Cut the completely cooled metal block into thin slices with a thickness of 200-300 μm on a diamond wire cutting machine, and grind to remove the oxide layer on the surface.

Embodiment 2

[0037] A. Weigh 668g of pure aluminum block (Al, purity 99.994%) and 332g of pure copper block (Cu, purity 99.996%), and remove the surface oxide layer.

[0038] B. Put the two metals together in the smelting furnace for deoxidation treatment.

[0039] C. Heat to 1150°C for 2 hours to ensure that the metal is completely melted and mixed evenly.

[0040] D. Use circulating water in the mold to rapidly cool the high-temperature liquid metal to room temperature at a speed of 100K / s.

[0041] E. Cut the completely cooled metal block into thin slices with a thickness of 200-300 μm on a diamond wire cutting machine, and grind to remove the oxide layer on the surface.

[0042] Verified by laser confocal microscopy, the sheet thickness distribution of the high-temperature liquid metal at a cooling rate of 300K / s is between 0.35-0.5μm, concentrated around 0.42μm.

[0043] Morphological and structural characterization of materials

[0044] The smelted Al-Cu alloy samples exhibited la...

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Abstract

The invention provides an Al-Cu eutectic alloy electrode with a lamellar structure, a preparation method of the Al-Cu eutectic alloy electrode and application of the Al-Cu eutectic alloy electrode in a water-based secondary aluminum ion battery, which belong to the technical field of water-based secondary aluminum ion battery electrode materials. The Al-Cu eutectic alloy electrode with the lamellar structure is formed by alternately arranging and stacking an aluminum layer and an Al2Cu intermetallic compound layer, the thickness of the aluminum layer is 0.18 mum, and the thickness of the Al2Cu intermetallic compound layer is 0.24 mum. The Al-Cu eutectic alloy electrode with the lamellar structure has a unique surface passivation film and a lamellar micro galvanic couple structure, so that the Al-Cu eutectic alloy electrode has higher conductivity and maintains higher stability in a metal surface stripping and deposition process, and the problem of dendritic crystals which are extremely easy to appear when an aluminum foil negative electrode affects long-term circulation is solved.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for water-based secondary aluminum-ion batteries, and in particular relates to the preparation of an Al-Cu eutectic alloy electrode with a lamellar structure and its application in water-based secondary aluminum-ion batteries. Background technique [0002] Lithium-ion batteries have dominated the global commercial battery segment owing to their high energy density. However, the development of lithium-ion batteries is limited by their limited reserves and high prices, and the safety of organic electrolytes has always been difficult to solve. Because of this, there is increasing interest in multivalent ion batteries such as Al-, Zn-, and Mg-ion batteries. Compared with lithium ions, these multivalent ions have higher charge loading capacity, smaller ionic radius and lower deposition potential, and these multivalent batteries can use safer and better performance water as electrolyte. Am...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/46H01M10/36C22C1/02C22C21/12
CPCH01M4/463H01M4/366H01M10/36C22C21/12C22C1/026H01M2004/027Y02P70/50
Inventor 郎兴友冉清韩丽平时航文子赵明蒋青
Owner JILIN UNIV