Flexible MXene self-supporting membrane/metal composite material and preparation method and application thereof

Abstract

The invention provides a preparation method for forming an electrode sheet on a flexible MXene self-supporting membrane through electroplating micro-nanometer metal particles. The invention belongs tothe preparation field of battery negative electrode materials. The technical scheme adopted by the invention is as follows: (1) etching stripping MAX with lithium fluoride and hydrochloric acid, centrifuging, washing, shaking and recentrifuging to obtain MXene suspension. (2) Flexible MXene self-supporting membrane was obtained by vacuum filtration. (3) Plating a layer of micro / nanometer metal particles on MXene film in electroplating bath at constant current or voltage. The flexible MXene self-supporting membrane prepared by the invention has good mechanical properties, It can not only simplify the process, save the cost and meet the needs of industrialization, but also can be used as negative electrode material to obtain batteries with high specific capacity, good cycling stability andbetter conductivity.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a flexible MXene self-supporting film / metal composite material and a preparation method and application thereof. Background technique [0002] The development of new energy materials has brought hope to solve energy and environmental problems, played an important role in the development of new energy, and at the same time gave birth to a number of new energy storage systems and their industries. In the composition of battery materials, electrode materials are important factors that determine their safety performance, electrochemical performance and future development. The electrode materials currently used all have problems such as low conductivity and surface activity, severe direct contact with the electrolyte, causing the electrode material to dissolve in the electrolyte, resulting in material damage, poor structure and electrochemical stability, etc., which seri...

AI Technical Summary

Problems solved by technology

Put the electrode material into the solvent and stir evenly, then add MXene and stir to obtain a uniform mixed solution, then use a spray dryer to spray and granulate to obtain MXene-coated electrode material powder, and then sinter and cool to obtain the electrode material, which effectively improves the electrode material. Conductivity, reduce the dissolution of ions in the electrolyte and the self-discharge effect, but the preparation process of this method is relatively complicated, and it cannot be directly made into electrode sheets

[0005] Patent CN 108091862A discloses a composite material of MXene and metal particles Sb / Bi used as a negative electrode of lithium batteries. In this method, MAX powder is put into a mixed solution of metal salt particles and hydrofluoric acid and stirred, then the product is centrifuged and washed, and dried to obtain a solid Powder, then mixed with binder and paste on copper foil as lithium battery negative electrode material, using high theoretical specific capacity Sb / Bi as active material and high conductivity MXene to effectively improve the cycle and specific capacity of the battery, However, the method not only has the safety problem of hydrofluoric acid used, but also obtains the product as powder, and the traditional pulping and slurry coating process is required to prepare the negative electrode sheet of the battery, and the preparation method is complicated.

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