A sodium ion intercalation ti 3 c 2 MXene material and its preparation method

Abstract

The invention relates to a sodium ion intercalation Ti 3 C 2 MXene material and its preparation method. Its technical scheme is: according to the mass ratio of titanium aluminum carbon powder: hydrochloric acid solution: lithium fluoride powder is (1.0~2.0): (2.0~4.0): 1 batching, stir in a water bath in a polyethylene plastic container, ultrasonic treatment and centrifugation to obtain solid I, then alternately wash solid I with deionized water and ethanol until the supernatant is neutral, and filter to obtain Ti 3 C 2 MXene material. the Ti 3 C 2 The MXene material was placed in NaOH solution, stirred in a water bath, and then subjected to ultrasonic treatment and centrifugation, alternately washed with deionized water and ethanol until the supernatant was neutral, and dried in vacuum to obtain sodium ion intercalated Ti 3 C 2 MXene material. The invention has the characteristics of mild preparation conditions and easy control; the prepared sodium ion intercalation Ti 3 C 2 MXene material has a large interlayer spacing and a large specific surface area, and it has a high mass specific capacity when used in lithium / 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