A method for preparing a corrosion-resistant current collector applied to aluminum-ion batteries

Abstract

The invention belongs to the field of electrochemical materials, and in particular relates to a corrosion-resistant current collector applied to an aluminum ion battery and a preparation method thereof. The current collector includes a metal foil and an amorphous nickel sulfide layer electroplated on the surface; the amorphous nickel sulfide layer wraps the metal foil; the thickness of the amorphous nickel sulfide layer is 1-1.5 microns. The preparation method of the current collector is to electroplate the metal foil for 15-20 minutes in an environment with a current density of 1-2 milliamperes per square centimeter; the electroplating solution includes boric acid, thiourea, nickel sulfate hexahydrate, and a solvent medium. The preparation method only needs common and cheap electroplating chemicals and electroplating equipment, and has low price, readily available raw materials and easy preparation. The prepared current collector has high conductivity, and the aluminum ion battery system containing the current collector has stable electrochemical performance, and the oxidation initiation potential in the electrolyte solution can reach 2.7V.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, and in particular relates to an electrolytic solution corrosion-resistant current collector applied to an aluminum ion battery and a preparation method thereof. Background technique [0002] As an efficient energy storage and conversion device, electrochemical energy storage devices have greatly promoted the development of human society. Among them, aluminum-ion batteries have many advantages such as safety and stability, abundant and cheap aluminum resources, etc., which are gradually becoming a research hotspot in the field of electrochemical energy storage. However, the electrolyte in aluminum-ion batteries exhibits high-strength Lewis acidity, and metal current collectors commonly used in the field of electrochemical energy storage, such as stainless steel, copper, iron, nickel, etc., will undergo severe corrosion and dissolution when used as current collectors for aluminum-ion batter...

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Problems solved by technology

[0004] Current collector materials that have been verified to be applicable can be classified into three categories. The first category is rare and precious metals: molybdenum, tungsten, and tantalum. They are expensive and scarce in output, making it difficult to commercialize them.

The second type is carbon current collectors. This kind of current collectors has a complicated process and is only suitable for small-scale experimental production in laboratories. It is not suitable for large-scale promotion. Moreover, carbon materials have low strength and low electrical conductivity, and there are many problems as current collector materials.

The third category is semiconductor materials, such as titanium nitride, chromium nitride, indium tin oxide, etc. These materials require expensive equipment such as inert atmosphere tube furnaces and magnetron sputtering, and the prepared materials are expensive and have low conductivity , all below 10^5S / m, it is not ideal as a current collector material

However, its protective layer is titanium-carbon compound, titanium-nitrogen compound, boron-titanium compound, carbon-tungsten compound, silicon-carbon compound or titanium-carbon-oxygen compound, the preparation process requires relatively expensive equipment, and the conductivity is low

[0007] In this regard, in the prior art, there is a lack of a current collector material for aluminum ion batteries that is cheap, easy to obtain raw materials, easy to prepare, high conductivity, and suitable for large-scale commercialization.

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