MXenes公司
材料科学
电化学
阳极
储能
化学工程
图层(电子)
分层(地质)
钠
离子
纳米技术
电极
有机化学
化学
冶金
生物
构造学
物理
工程类
物理化学
古生物学
功率(物理)
量子力学
俯冲
作者
Yuting Wu,Ping Nie,Jiang Wang,Hui Dou,Xiaogang Zhang
标识
DOI:10.1021/acsami.7b12155
摘要
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–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.
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