Sodium-ion intercalated Ti3C2 MXene material and preparation method thereof

Abstract

The invention relates to a sodium-ion intercalated Ti3C2 MXene material and a preparation method thereof. The technical scheme includes that the preparation method includes the steps: matching materials titanium aluminum carbon powder, hydrochloric acid solution and lithium fluoride powder according to the weight ratio of (1.0-2.0):(2.0-4.0):1, performing water bath stirring in a polyethylene plastic container, and ultrasonically and centrifugally treating mixture to obtain solid I; alternately washing the solid I by the aid of deionized water and ethyl alcohol until liquid supernatant is neutral, and filtering mixture to prepare the Ti3C2 MXene material; placing the Ti3C2 MXene material into NaOH solution to perform water bath stirring, ultrasonically and centrifugally treating mixture, alternately washing the mixture by the aid of deionized water and ethyl alcohol until liquid supernatant is neutral, and performing vacuum drying to prepare the sodium-ion intercalated Ti3C2 MXene material. The preparation method has the advantages of mild preparation condition and easiness in control, and the prepared sodium-ion intercalated Ti3C2 MXene material is wide interlayer spacing and large in specific surface area and has higher mass specific capacity when being applied to lithium and sodium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of MXene. Specifically relate to a kind of sodium ion intercalation Ti 3 C 2 MXene material and its preparation method. Background technique [0002] MXene is a new type of two-dimensional transition metal carbide or carbonitride with a graphene-like structure and its chemical formula is M n+1 x n T z (n=1, 2, 3), where M is an early transition metal element, X is carbon or nitrogen, and T is F - , OH - and other surface-linked reactive functional groups. The precursor for preparing MXene is the MAX phase, and the A element in MAX can be selectively etched away by the chemical liquid phase method to obtain the corresponding MXene phase. At present, the MXene phases that have been successfully prepared include Ti 2 CT x 、Ti 3 C 2 T x , (Ti 0.5 ,Nb 0.5 ) 2 CT x 、Ti 3 CNT x , V 2 CT x There are more than 60 kinds. MXene phase has a unique two-dimensional morphology and chemical compositio...

AI Technical Summary

Problems solved by technology

This method can reduce the hazards in the hydrogen fluoride etching process, but because NaHF 2 Easy to deliquescence and pyrolysis (160°C), it needs to be protected during the experiment, which increases the complexity of the experiment process

and NaHF 2 In the liquid phase reaction, etching and intercalation are carried out at the same time, so there will be a problem of incomplete etching reaction, and incomplete etching reaction will cause the material layer spacing to be small, resulting in a decrease in the number of sodium ions that can be inserted, and then leading to a decrease in its electrochemical performance