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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Organic Photovoltaics and Electronics II (joint session CPP/DS/HL, organized by HL)

CPP 39.10: Vortrag

Mittwoch, 22. März 2017, 17:30–17:45, POT 81

Potassium Prussian Blue Nanoparticles: A Low-cost Cathode Material for Potassium-ion Batteries — •Yang Xu, Min Zhou, Liying Liang, and Yong Lei — Institute für Physics & IMN MacroNano (ZIK), Technische Universität Ilmenau, Ilmenau 98693, Germany

Potassium-ion batteries (KIBs) in organic electrolytes hold great promise owing to the abundance of potassium, close redox potential to lithium, and similar electrochemistry with lithium system. Investigations of KIB cathodes have been scarcely reported so far. We for the first time report hydrated potassium Prussian blue K0.220Fe[Fe(CN)6]0.805 nanoparticles as a potential cathode material. The cathode exhibits a high discharge voltage of 3.1~3.4 V, high reversible capacity of 73.2 mAh g-1, and great cyclability with a very small capacity decay rate of ~0.09% per cycle. Electrochemical reaction mechanism analysis identifies the carbon-coordinated FeIII/FeII couple as redox-active site and proves structural stability of the cathode during charge/discharge. Furthermore, we present a KIB full-cell by coupling the nanoparticles with commercial carbon materials. The full-cell delivers a capacity of 68.5 mAh g-1 at 100 mA g-1 and retains 93.4% of the capacity after 50 cycles. Considering the low cost and material sustainability, this work may trigger future attention on rechargeable KIBs.

Reference

C. Zhang, Y. Xu, M. Zhou, L. Liang, H. Dong, M. Wu, Y. Yang, Y. Lei, Adv. Funct. Mater. 2016, DOI: 10.1002/adfm.201604307.