期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 50, 页码 43681-43687出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b13944
关键词
V2O5; sisal-like morphology; hierarchical structure; cathode materials; lithium-ion batteries
资金
- National Natural Science Foundation of China [21373107]
- Colleges and Universities in Henan Province Key Science and Research Project [16A530007]
- Henan Natural Science Foundation of China [162300410200]
- Guangdong special support program [2015TQ01N401]
- Production-Study Research Cooperation Project Of Guangdong Province [2014B090901021]
Vanadium pentoxide (V2O5) is considered a promising cathode material for advanced lithium-ion batteries due to its high specific capacity and low cost. However, the application of V2O5-based electrodes has been hindered by their inferior conductivity, cycling stability and power performance. Herein, hierarchical sisal-like V2O5 microstructures consisting of primary one-dimension (1D) nanobelt with [001] facets orientation growth and rich oxygen vacancies are synthesized through a facile hydrothermal process using polyoxyethylene-20-cetyl-ether as surface control agent, and followed by calcination. The primary 1D nanobelt shortens the transfer path of electrons and ions, and the stable {001} facets could reduce the side reaction at the interface of electrode/electrolyte, simultaneously. Moreover, the formation of low valence state vanadium would generate the oxygen vacancies to facilitate the lithium ion diffusion. As a result, the sisal-like V2O5 manifests excellent electrochemical performances, including high specific capacity (297 mAh g(-1) at a current of 0.1 C) and robust cycling performance (capacity fading 0.06 % per cycle). This work develops a controllable method to craft the hierarchical sisal-like V2O5 microstructures with excellent high rate and long-term cyclic stability.
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