A New High-Energy Cathode for a Na-Ion Battery with Ultrahigh Stability

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Large-scale electric energy storage is a key enabler for the use of renewable energy. Recently, the room-temperature Na-ion battery has been rehighlighted as an alternative low-cost technology for this application. However, significant challenges such as energy density and long-term stability must be addressed. Herein, we introduce a novel cathode material, Na1.5VPO4.8F0.7, for Na-ion batteries. This new material provides an energy density of similar to 600 Wh kg(-1), the highest value among cathodes, originating from both the multielectron redox reaction (1.2 e(-) per formula unit) and the high potential (similar to 3.8 V vs Na+/Na) of the tailored vanadium redox couple (V3.8+/V5+). Furthermore, an outstanding cycle life (similar to 95% capacity retention for 100 cycles and similar to 84% for extended 500 cycles) could be achieved, which we attribute to the small volume change (2.9%) upon cycling, the smallest volume change among known Na intercalation cathodes. The open crystal framework with two-dimensional Na diffusional pathways leads to low activation barriers for Na diffusion, enabling excellent rate capability. We believe that this new material can bring the low-cost room-temperature Na-ion battery a step closer to a sustainable large-scale energy storage system.
Publisher
AMER CHEMICAL SOC
Issue Date
2013-09
Language
English
Article Type
Article
Keywords

SODIUM RECHARGEABLE BATTERIES; ELECTROCHEMICAL PROPERTIES; ELECTRODE PERFORMANCE; LITHIUM BATTERIES; STORAGE MECHANISM; FLUOROPHOSPHATE; PYROPHOSPHATE; CONDUCTIVITY; NA3V2(PO4)3; DIFFRACTION

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.135, no.37, pp.13870 - 13878

ISSN
0002-7863
DOI
10.1021/ja406016j
URI
http://hdl.handle.net/10203/189496
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