Rechargeable-dischargeable aluminum ion battery taking copper-selenium compound as positive electrode

Abstract

The invention discloses a rechargeable-dischargeable aluminum ion battery taking a copper-selenium compound as a positive electrode, and relates to the aluminum ion battery. The positive electrode material is a copper-selenium compound; the material comprises Cu2-xSe in a non-stoichiometry state and CuSe2, CuSe and Cu2Se and the like in a stoichiometry state; the negative electrode material is high-purity aluminum or an aluminum-containing alloy; and electrolyte is a non-aqueous electrolyte comprising aluminium ions. The aluminum ion battery provided by the invention has the advantages of high charging-discharging specific capacity, high cycling stability, inexpensive raw materials, simple preparation process and the like, so that the aluminum ion battery is suitable for the industrial large-scale production; the charging specific capacity in the initial cycle can reach 342mAh g<-1>, after 19 cycles, the charging specific capacity is 259mAh g<-1>, and the capacity retention ratio is 76%; and the aluminum ion battery can be widely applied in many fields of electronic communication, an electric vehicle and the like.

Description

technical field [0001] The invention relates to an aluminum ion battery, in particular to a rechargeable and dischargeable aluminum ion battery with a copper selenium compound as the positive electrode. Background technique [0002] Since 1990, lithium-ion batteries have been widely promoted and applied all over the world because of their advantages such as long cycle life, no memory effect, high energy density, and high working potential. Facing the bad news of the depletion of lithium resources for decades, it is imminent to develop a new battery system to replace lithium-ion batteries. [0003] In recent years, multivalent ion batteries represented by aluminum ion batteries have attracted wide attention. Aluminum is rich in resources and is the most abundant metal in the earth's crust. Furthermore, the volume specific energy density of aluminum negative electrodes is much higher than that of lithium, and aluminum-ion batteries also have the advantages of strong bendabil...

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Problems solved by technology

However, in previous reports, the research on aluminum-ion batteries has encountered many problems, such as the decomposition of positive electrode materials, low battery voltage, poor cycle performance, and difficult selection of electrolytes, etc., all of which need to be solved urgently

Of course, these articles also introduced a series of new electrode materials for Al-ion batteries, such as V 2 o 5 (Wang, H.et al.Binder-free V2O5cathode forgreener rechargeable aluminum battery[J].ACS applied materials&interfaces,2015), TiO 2 (He,Y.et al.Black mesoporous anatase TiO2nanoleaves:a high capacity and high rate anode for aqueous Al-ion batteries[J].J.Mater.Chem.A,2014), graphite fluoride (Rani,J.et al .Fluorinated Natural Graphite Cathode for Rechargeable I

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