Liquid K-Na Alloy Anode Enables Dendrite-Free Potassium Batteries.

Xue, Leigang; Gao, Hongcai; Zhou, Weidong; Xin, Sen; Park, Kyusung; Li, Yutao; Goodenough, John B · Adv Mater · 2016

basic_science · Level V

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Abstract

A K-Na liquid alloy allows a dendrite-free high-capacity anode; its immiscibility with an organic liquid electrolyte offers a liquid-liquid anode-electrolyte interface. Working with a sodiated Na<sub>2</sub> MnFe(CN)<sub>6</sub> cathode, the working cation becomes K<sup>+</sup> to give a potassium battery of long cycle life with an acceptable capacity at high charge/discharge rates.