MoS2 Nanoflowers with Expanded Interlayers as High-Performance Anodes for Sodium-Ion Batteries

被引：721

作者：

Hu, Zhe ^{[1
]}

Wang, Lixiu ^{[1
]}

Zhang, Kai ^{[1
]}

Wang, Jianbin ^{[1
]}

Cheng, Fangyi ^{[1
]}

Tao, Zhanliang ^{[1
]}

Chen, Jun ^{[1
]}

机构：

[1] Nankai Univ, Key Lab Adv Energy Mat Chem, Collaborat Innovat Ctr Chem Sci & Engn, Minist Educ, Tianjin 300071, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2014年 / 53卷 / 47期

关键词：

electrochemical exfoliation; expanded layers; MoS2; pseudocapacitance; sodium-ion batteries; EXCELLENT ELECTROCHEMICAL PERFORMANCE; HIGH-CAPACITY; SINGLE-LAYER; LITHIUM; NANOCOMPOSITES; MECHANISM; STORAGE; NANOWIRES; ELECTRODE; CATHODE;

D O I：

10.1002/anie.201407898

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

MoS2 nanoflowers with expanded interlayer spacing of the (002) plane were synthesized and used as high-performance anode in Na-ion batteries. By controlling the cut-off voltage to the range of 0.4-3 V, an intercalation mechanism rather than a conversion reaction is taking place. The MoS2 nanoflower electrode shows high discharge capacities of 350 mAhg(-1) at 0.05 Ag-1, 300 mAhg(-1) at 1 Ag-1, and 195 mAhg(-1) at 10 Ag-1. An initial capacity increase with cycling is caused by peeling off MoS2 layers, which produces more active sites for Na+ storage. The stripping of MoS2 layers occurring in charge/discharge cycling contributes to the enhanced kinetics and low energy barrier for the intercalation of Na+ ions. The electrochemical reaction is mainly controlled by the capacitive process, which facilitates the high-rate capability. Therefore, MoS2 nanoflowers with expanded interlayers hold promise for rechargeable Na-ion batteries.

引用

页码：12794 / 12798

页数：5