Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 6, Pages 2164-2167Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b12598
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Funding
- U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering [DE-SC0005397]
- U.S. National Science Foundation [CBET-1438007]
- Lawrence Berkeley National Lab BMR Program [7223523]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1438007] Funding Source: National Science Foundation
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Potassium has as rich an abundance as sodium in the earth, but the development of a K-ion battery is lagging behind because of the higher mass and larger ionic site of K+ than that of Li+ and Na+, which makes it difficult to identify a high-voltage and high capacity intercalation cathode host. Here we propose a cyanoperovskite KxMnFe(CN)(6) (0 <= x <= 2) as a potassium cathode: high-spin Mn-III/Mn-II and low-spin Fe-III/F-II couples have similar energies and exhibit two close plateaus centered at 3.6 V; two active K+ per formula unit enable a theoretical specific capacity of 156 mAh g(-1); Mn and. Fe are the two most-desired transition metals for electrodes because they are cheap and; environmental friendly. As a powder prepared by an inexpensive precipitation method, the cathode delivers a specific capacity of 142 mAh g(-1). The observed voltage, capacity, and its low cost make it competitive In large-scale electricity storage applications.
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