Facile synthesis of Bi2MoO6/reduced graphene oxide composites as anode materials towards enhanced lithium storage performance

Xiangang Zhai; Jianping Gao; Ruinan Xue; Xiaoyang Xu; Luyao Wang; Qiang Tian; Yu Liu

doi:10.1016/j.jcis.2018.02.012

Facile synthesis of Bi₂MoO₆/reduced graphene oxide composites as anode materials towards enhanced lithium storage performance

J Colloid Interface Sci. 2018 May 15:518:242-251. doi: 10.1016/j.jcis.2018.02.012. Epub 2018 Feb 7.

Authors

Xiangang Zhai¹, Jianping Gao¹, Ruinan Xue¹, Xiaoyang Xu², Luyao Wang¹, Qiang Tian¹, Yu Liu³

Affiliations

¹ Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, PR China.
² School of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, PR China.
³ Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, PR China. Electronic address: tjly@tju.edu.cn.

PMID: 29471201
DOI: 10.1016/j.jcis.2018.02.012

Abstract

Bi₂MoO₆/reduced graphene oxide (Bi₂MoO₆/rGO) composites were fabricated by a facile one-pot hydrothermal approach, in which Bi₂MoO₆ nanosheets and rGO were simultaneously obtained. The structure and composition of the as-synthesized Bi₂MoO₆ and Bi₂MoO₆/rGO materials were characterized via FT-IR, BET, TGA, XRD, TEM, SEM and XPS analyses, and the electrochemical performance of Bi₂MoO₆/rGO as an anode in a lithium-ion battery was investigated. Compared with pristine Bi₂MoO₆, the Bi₂MoO₆/rGO composites have higher capacities, better cycle stability and higher rates. For a current density of 100 mA g^-1, the initial discharge capacities of the Bi₂MoO₆/rGO-20 and pristine Bi₂MoO₆ were 1049.6 mAh g^-1 and 528.5 mAh g^-1, respectively. After 100 cycles, the capacity retention for the Bi₂MoO₆/rGO-20 and pristine Bi₂MoO₆ were respectively 80.4% and 30.7% using the 2nd cycle capacities (895.8 and 402.4 mAh g^-1) as references. The enhanced electrochemical performance can be ascribed to the synergistic effect of the Bi₂MoO₆ and rGO sheets, which dramatically improves the conductivities of the Bi₂MoO₆/rGO anodes. In addition, the rGO sheets also supply electron transfer routes for the anode and suppress volume changes of Bi₂MoO₆ nanosheets during the charge-discharge cycles.

Keywords: Anode materials; Bismuth molybdate; Hydrothermal approach; Lithium-ion batteries; Reduced graphene oxide.