期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 7, 页码 2658-2664出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja512383b
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资金
- Advanced Research Projects Agency-Energy, United States Department of Energy [DE-AR0000297]
- United States Department of Energy, the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies [DE-AC02-98CH10886, DE-SC0012704]
- United States Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886, DE-SC0012704]
- Scientific User Facilities Division, Office of Basic Energy Sciences, United States Department of Energy
Sodium is globally available, which makes a sodium-ion rechargeable battery preferable to a lithium-ion battery for large-scale storage of electrical energy, provided a host cathode for Na can be found that provides the necessary capacity, voltage, and cycle life at the prescribed charge/discharge rate. Low-cost hexacyanometallates are promising cathodes because of their ease of synthesis and rigid open framework that enables fast Na+ insertion and extraction. Here we report an intriguing effect of interstitial H2O on the structure and electrochemical properties of sodium manganese(II) hexacyanoferrates(II) with the nominal composition Na2MnFe(CN)(6)(.)zH(2)O (Na-2-delta MnHFC). The newly discovered dehydrated Na2-delta MnHFC phase exhibits superior electrochemical performance compared to other reported Na-ion cathode materials; it delivers at 3.5 V a reversible capacity of 150 mAh g(-1) in a sodium half cell and 140 mAh g(-1) in a full cell with a hard-carbon anode. At a charge/discharge rate of 20 C, the half-cell capacity is 120 mAh g(-1), and at 0.7 C, the cell exhibits 75% capacity retention after 500 cycles.
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