Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-00211-5
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Funding
- National Key Research and Development Program of China [2016YFA0202603]
- National Basic Research Program of China [2013CB934103]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- National Natural Science Foundation of China [51521001, 11404230]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Foundation of Science and Technology Bureau of Sichuan Province [2013JY0085]
- Fundamental Research Funds for the Central Universities [WUT: 2016III001, 2017III009]
- project of Innovative group for low cost and long cycle life Na ion batteries R&D and industrialization of Guangdong Province [2014ZT05N013]
- China Scholarship Council [201606955096]
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The abundance of sodium resources indicates the potential of sodium-ion batteries as emerging energy storage devices. However, the practical application of sodium-ion batteries is hindered by the limited electrochemical performance of electrode materials, especially at the anode side. Here, we identify alkaline earth metal vanadates as promising anodes for sodium-ion batteries. The prepared calcium vanadate nanowires possess intrinsically high electronic conductivity (>100 S cm(-1)), small volume change (<10%), and a self-preserving effect, which results in a superior cycling and rate performance and an applicable reversible capacity (>300 mAh g(-1)), with an average voltage of similar to 1.0 V. The specific sodium-storage mechanism, beyond the conventional intercalation or conversion reaction, is demonstrated through in situ and ex situ characterizations and theoretical calculations. This work explores alkaline earth metal vanadates for sodium-ion battery anodes and may open a direction for energy storage.
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