Preparation method of zinc/carbon nanotube foam composite material

Abstract

The invention discloses a preparation method of a zinc / carbon nanotube foam composite material. The preparation method comprises: placing the carbon nanotube aggregates in a reaction chamber and introducing a carbon source, thereby depositing carbon particles on the surface and / or inside of the carbon nanotube aggregates to obtain carbon nanotube foams; and performing cyclic voltammetry The carbon nanotube foam is modified by the method to obtain the modified carbon nanotube foam; the modified carbon nanotube foam and the zinc electrode are respectively used as the cathode and the anode into the solution containing zinc ions, and the carbon nanotube foam is deposited on the carbon by the electrodeposition method. Zinc is deposited on the surface and / or inside of the nanotube foam to obtain a zinc / carbon nanotube foam composite material. The preparation method provided by the present invention has strong controllability of the electrodeposition technology, and the method is simple, and can be applied to mass production of composite electrodes; and, the raw materials used in the preparation process are all low-toxic and non-toxic reagents, and the aqueous solution is also It meets the policy requirements of green environmental protection and low energy consumption.

Description

technical field [0001] The present invention relates to a zinc / carbon nanotube foam composite material and its preparation method and application, in particular to a zinc / carbon nanotube foam composite material with a three-dimensional structure and high discharge depth which is suitable for neutral water-based zinc-ion batteries and The preparation method and application thereof belong to the technical field of nanometer materials. Background technique [0002] The depletion of fossil resources such as petroleum and coal and the increasingly serious environmental pollution have made the development of green, efficient and sustainable new energy sources the top priority of the current society. Among them, aqueous zinc-ion batteries have attracted the attention of researchers. As a negative electrode material, zinc is not only rich in resource reserves on the earth, but also non-toxic, environmentally friendly, and safe. It has a high negative electrode potential (standard e...

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Problems solved by technology

[0004] At present, most reports use constant current deposition of zinc and carbon nanotube films as flexible electrodes, or the existing technology of directly casting foam structure zinc by using abrasive tools does not fundamentally solve the problems caused by dendrite growth. It has the problem of forming zinc dendrites during the charge-discharge cycle, which leads to short circuit, zinc stripping and deactivation, which greatly reduces the cycle life and stability of the electrode and battery; In the process, non-reactive substances (such as zinc oxide) are formed or dendrites are exfoliated and deactivated, which reduces the actual working specific surface area of ​​the electrode, and the electrode density will naturally increase, resulting in polarization, thus making the cycle stable. In addition, the zinc composite electrode in the prior art cannot realize a stable cycle at a high depth of discharge (> 40% DOD), and will be damaged rapidly under a deep discharge situation (80% DOD); no Composite substrates (such as pure zinc flakes) cannot achieve 100% DOD charge and discharge; in addition, due to the low cost of zinc metal itself, the existing zinc anode technology is used in a consumable manner, and long-term normal operation can be maintained by supplementing and replacing new zinc anodes The way of circular operation causes a lot of waste, which runs counter to the development trend of low energy consumption in society

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