Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 135, Issue 37, Pages 13870-13878Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja406016j
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Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20124010203320, 20112010100140]
- World Premier Materials grant
- Korea government Ministry of Trade, Industry and Energy
- Supercomputing Center/Korea Institute of Science and Technology Information [KSC-2012-C2-78]
- Research Center Program of IBS (Institute for Basic Science) in Korea
- NRF (National Research Foundation of Korea)
- Korean Government
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037920, 20112010100140, 20124010203320] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS EM1301] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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