Few-Layer MXenes Delaminated via High-Energy Mechanical Milling for Enhanced Sodium-Ion Batteries Performance

作者：Wu, Yuting; Nie, Ping; Wang, Jiang; Dou, Hui; Zhang, Xiaogang^*

来源：ACS Applied Materials & Interfaces, 2017, 9(45): 39610-39617.

DOI：10.1021/acsami.7b12155

• MXene
• few layers
• high-energy mechanical milling
• DMSO
• anode
• sodium-ion batteries

The global availability of sodium makes the exploration of superior sodium-ion batteries attractive for energy storage application. MXenes, as one of the most promising anodes for sodium-ion batteries, have been reported to have many advantages, such as high electronic conductivity and a hydrophilic surface. However, the compact multilayer structure and deficient delamination significantly inhibits their application, requiring high energy and showing decreased storage capacity and poor rate capabilities. Few-layer MXene has been proved to benefit superior electrochemical properties with a better ionic conductivity and two-dimensional layer structure. Herein, we report scale delamination of few-layer MX enenanosheets as anodes for sodium-ion batteries, which are prepared via an organic solvent assist high-energy mechanical-milling method. This approach efficiently prevents the oxidation of MXene and produces few-layer nanosheets structure, facilitating fast electron transport and Na+ diffusion. Electrochemical tests demonstrate that the few-layer MXenes show high specific capacity, excellent cycle stability, and good rate performance. Specifically, few-layer MXene nanosheets deliver a high reversible capacity of 267 mA h(-1). at a current density of 0.1 A g(-1). After cycling 1500 cycles at a high rate of 1 A g(-1), a reversible capacity of 76 mA h g(-1) could be maintained.

• 出版日期2017-11-15
• 单位南京航空航天大学