Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Postersession KFM

KFM 14.6: Poster

Wednesday, April 3, 2019, 16:00–18:30, Poster C

A low cost potassium Prussian blue cathode for potassium ion batteries — •Chenglin Zhang, Yang Xu, Long Liu, and Yong Lei — Institute für Physics & IMN MacroNano (ZIK), Technische Universität Ilmenau, Ilmenau 98693, Germany

Potassium-ion batteries (PIBs) have attracted increasing attention as a promising alternative to lithium-ion batteries. The hydrated potassium Prussian blue, K0.220Fe[Fe(CN)6]0.805, as a potential cathode material is first demonstrated in PIBs. The cathode exhibits a large reversible capacity within a high and flat potassiation potential of 3.1~3.4 V as well as a great cyclability. Electrochemical reaction mechanism analysis identifies the carbon-coordinated FeIII/FeII couple as redox-active site and proves structural stability of the cathode during charging/discharging. Furthermore, we present a PIB full-cell by coupling the Prussian blue nanoparticles with commercial carbon materials, which confirms the value of practical applications.[1] Considering the low cost and material sustainability, this work is of great significance for the future research and commercial applications of PIBs electrode materials.

[1] Chenglin Zhang, Yang Xu, Min Zhou, Liying Liang, Huishuang Dong, Minghong Wu, Yi Yang, and Yong Lei*[J] Adv. Funct. Mater. (2017):1604307.