Low-Cost High-Energy Potassium Cathode

Leigang Xue, Yutao Li, Hongcai Gao, Weidong Zhou, Xujie Lü, Watchareeya Kaveevivitchai, Arumugam Manthiram, John B. Goodenough

Research output: Contribution to journalArticlepeer-review

282 Citations (Scopus)

Abstract

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 KxMnFe(CN)6 (0 ≤ x ≤ 2) as a potassium cathode: high-spin MnIII/MnII and low-spin FeIII/FeII 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.

Original languageEnglish
Pages (from-to)2164-2167
Number of pages4
JournalJournal of the American Chemical Society
Volume139
Issue number6
DOIs
Publication statusPublished - 2017 Feb 15

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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