Article Title

Preparation and electrochemical characterization of ultrathin WO_3−x /C nanosheets as anode materials in lithium ion batteries

Authors

Keyan Bao, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China Department of Chemistry, Tsinghua University, Beijing 100084, China
Wutao Mao, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
Guangyin Liu, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
Liqun Ye, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
Haiquan Xie, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
Shufang Ji, Department of Chemistry, Tsinghua University, Beijing 100084, China
Dingsheng Wang, Department of Chemistry, Tsinghua University, Beijing 100084, China
Chen Chen, Department of Chemistry, Tsinghua University, Beijing 100084, China
Yadong Li, Department of Chemistry, Tsinghua University, Beijing 100084, China

Keywords

WO3−x/C, one-pot process, O-vacancies, lithium-ion batteries, anodes

Abstract

ABSTRACT Ultrathin two-dimensional (2D) nanomaterials offer unique advantages compared to their counterparts in other dimensionalities. O-vacancies in such materials allow rapid electron diffusion. Carbon doping often improves the electric conductivity. Considering these merits, the WO3−x/C ultrathin 2D nanomaterial is expected to exhibit excellent electrochemical performance in Li-ion batteries. Here, ultrathin WO3−x/C nanosheets were prepared via an acid-assisted one-pot process. The as-prepared WO3−x/C ultrathin nanosheets showed good electrochemical performance, with an initial discharge capacity of 1,866 mA·h·g−1 at a current density of 200 mA·g−1. After 100 cycles, the discharge and charge capacities were 662 and 661 mA·h·g−1, respectively. The reversible capacity of the WO3−x/C ultrathin nanosheets exceeded those of WO3 and WO3−x nanosheets. The electrochemical testing results demonstrated that WO3−x/C ultrathin nanosheets are promising alternative anode materials for Li-ion batteries.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-016-1373-6

Publisher

Tsinghua University Press

Recommended Citation

Keyan Bao,Wutao Mao,Guangyin Liu,Liqun Ye,Haiquan Xie,Shufang Ji,Dingsheng Wang,Chen Chen,Yadong Li, Preparation and electrochemical characterization of ultrathin WO3−x /C nanosheets as anode materials in lithium ion batteries. NanoRes.2017, 10(6): 1903–1911