Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4767755 | Electrochimica Acta | 2016 | 9 Pages |
Abstract
We demonstrate a facile hydrothermal synthesis of SnO2/MoO3-x nanocomposites with ultrafine SnO2 crystallites uniformly embedded into an amorphous MoO3-x matrix, which demonstrate superior electrochemical performance as anodes for lithium ion batteries, including long-term cycling stability (953 mA h/g after 100 cycles at 200 mA/g), high rate capability (668.0 mA h/g after 1000 cycles at 1000 mA/g) and high initial Coulombic efficiency (81.3% at 200 mA/g). Synergistic effects of the both components SnO2 and MoO3-x on the lithium storage are revealed by electrochemical characterization and supported by TEM and XPS analysis performed at the different discharge/charge states of the respective electrodes. SnO2 nanocrystallites confined within the amorphous MoO3-x matrix efficiently buffer the volume changes of Li-Sn alloying-dealloying upon cycling, while the metallic Mo in situ generated by a conversion reaction of MoO3-x promotes the reversible reaction SnO2 + Li+ â Sn + Li2O. In addition, the amorphous MoO3-x with bulk or surface defects allows for a better lithium insertion and thus enhanced capacity.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Daxian Cao, Hongkang Wang, Beibei Li, Chao Li, Sanmu Xie, Andrey L. Rogach, Chunming Niu,