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Affiliation of Author(s):材料科学与技术学院

Journal:ACS Appl. Mater. Interfaces

Abstract: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 MXene nanosheets 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 g-1at 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-1could be maintained. © 2017 American Chemical Society.

ISSN No.:1944-8244

Translation or Not:no

Date of Publication:2017-11-15

Co-author:吴宇婷,聂平,王江,Zhang Xiaogang

Correspondence Author:Zhang Xiaogang,Dou Hui