化学
阴极
钾
插层(化学)
电化学
公式单位
钠
离子键合
电池(电)
过渡金属
无机化学
电极
离子
结晶学
晶体结构
物理化学
热力学
有机化学
物理
催化作用
功率(物理)
作者
Leigang Xue,Yutao Li,Hongcai Gao,Weidong Zhou,Xiaofeng Lu,Watchareeya Kaveevivitchai,Arumugam Manthiram,John B. Goodenough
摘要
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.
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