skip to main content

DOE PAGESDOE PAGES

Title: Low-Cost High-Energy Potassium Cathode

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 size 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 K xMnFe(CN) 6 (0 ≤ x ≤ 2) as a potassium cathode: high-spin Mn III/Mn II and low-spin Fe III/Fe 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. Lastly, the observed voltage, capacity, and its low cost make it competitive in large-scale electricity storage applications.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [2] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Univ. of Texas, Austin, TX (United States). Texas Materials Inst.
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-20899
Journal ID: ISSN 0002-7863
Grant/Contract Number:
AC52-06NA25396l; SC0005397; CBET-1438007; 7223523
Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 139; Journal Issue: 6; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; Material Science
OSTI Identifier:
1352429