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- Title
Sponge-Like Cathode Material Self-Assembled from Two-Dimensional V<sub>2</sub>O<sub>5</sub> Nanosheets for Sodium-Ion Batteries.
- Authors
Zhu, Kai; Zhang, Chaofeng; Guo, Shaohua; Yu, Haijun; Liao, Kaiming; Chen, Gang; Wei, Yingjin; Zhou, Haoshen
- Abstract
A sponge-like V2O5 nanomaterial is prepared by a freeze-drying method and evaluated as a cathode material for sodium-ion batteries. The sponge-like structure is self-assembled from V2O5 nanosheets that can sustain high pressure (400 times their own weight), thus leading to a high structure stability. The numerous macropores in the spongy structure can effectively soak up the electrolyte. Moreover, the exposed (001) facet of the nanosheets is favorable for charge transfer at the electrolyte/electrode interface. The thin nanosheets along the [001] axis provide short diffusion pathways for sodium ions. Electrochemical experiments show that the material has a high discharge capacity of 216 mAh g−1 at a current density of 20 mA g−1. In addition, the material shows a good capacity retention of 73 % in 100 charge-discharge cycles at a current density of 100 mA g−1.
- Subjects
NANOSTRUCTURED materials; CATHODES; SODIUM ions; MACROPORES (Catalysis); ELECTROLYTES; ELECTROCHEMICAL analysis
- Publication
ChemElectroChem, 2015, Vol 2, Issue 11, p1660
- ISSN
2196-0216
- Publication type
Article
- DOI
10.1002/celc.201500240