期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms6280
关键词
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资金
- Global Climate and Energy Project at Stanford
- US Department of Energy (DOE) Office of Electricity Delivery and Energy Reliability
- Pacific Northwest National Laboratory
- DOE [DEA C05-76RL01830]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [NRF-2012R1A6A3A03038593]
- Fondazione Oronzio e Niccolo De Nora
- National Science Foundation Graduate Research Fellowship
- National Defense Science and Engineering Fellowship
- US DOE [DE-AC02-06CH11357]
Potential applications of sodium-ion batteries in grid-scale energy storage, portable electronics and electric vehicles have revitalized research interest in these batteries. However, the performance of sodium-ion electrode materials has not been competitive with that of lithium-ion electrode materials. Here we present sodium manganese hexacyanomanganate (Na2MnII[Mn-II(CN)(6)]), an open-framework crystal structure material, as a viable positive electrode for sodium-ion batteries. We demonstrate a high discharge capacity of 209 mAh g(-1) at C/5 (40 mA g(-1)) and excellent capacity retention at high rates in a propylene carbonate electrolyte. We provide chemical and structural evidence for the unprecedented storage of 50% more sodium cations than previously thought possible during electrochemical cycling. These results represent a step forward in the development of sodium-ion batteries.
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