Removal of interstitial H2O in hexacyanometallates for a superior cathode of a sodium-ion battery.
By Jie I. Song, Longde Wang, Yuhao Lu, Jue Liu, Bingkun Guo, Penghao Xiao, Jong-Jan Lee, Xiao‐Qing Yang, Graeme Henkelman, John B. Goodenough. Journal of the American Chemical Society, 2015
783 citations recorded by the source corpus.
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·zH2O (Na2-δMnHFC). The newly discovered dehydrated Na2-δMnHFC 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.
Subfields: Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/88b79c13d7cfd5b9574e85cde222ea8487cdd4a6
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.