Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (1): 35-41.doi: 10.19799/j.cnki.2095-4239.2022.0513

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Sodium storage anode based on titanium-based MXene and its performance regulation mechanism

Wenshu ZHANG(), Fangyuan HU, Hao HUANG, Xudong WANG, Man YAO()   

  1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2022-09-08 Revised:2022-10-13 Online:2023-01-05 Published:2023-02-08
  • Contact: Man YAO E-mail:zws0719@163.com;yaoman@dlut.edu.cn

Abstract:

One class of sodium-ion battery anode materials that has received a lot of attention is two-dimensional MXene materials with significant and controllable interlayer spacing. The titanium-based carbide, MXene, is chosen as the study's target material to investigate the mechanisms that control how well these materials store sodium. The first-principle calculation prediction and experimental verification method is used to investigate the effects of composition and structure regulation on sodium storage performance. While structural regulation entails creating a heterostructure of Ti3C2T x MXene and transition metal chalcogenides, composition regulation entails functional group substitution and nitrogen replacement with carbon. According to findings, heterostructures and the functional group -O can increase the interlayer space and prevent the MXene from stacking its interlayers; N can be replaced to improve charge transfer, which helps to increase stability and conductivity and raise the material's specific capacity. Among them, the creation of heterostructures has the most notable improvement in terms of all-around performance. This study provides a theoretical framework for choosing anode materials for sodium-ion batteries, which are helpful in creating high-performance MXene-based sodium storage anode materials. Additionally, the analysis method suggested in this work can be expanded to the research on the structure and characteristics of electrode materials for metal-ion batteries.

Key words: anode materials, MXene, regulation methods, first principles, Na storage mechanism

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