Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 19: Battery Materials

MM 19.2: Talk

Tuesday, March 13, 2018, 10:30–10:45, H 0106

Low-cost K0.220Fe[Fe(CN)6]0.805 as Cathode Material for Potassium-ion Batteries — •Chenglin Zhang, Yang Xu, Min Zhou, Long Liu, and Yong Lei — Institute für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, Ilmenau 98693, Germany

Benefiting from the abundance of potassium, close redox potential to lithium, and similar electrochemistry to lithium system, potassium-ion batteries (PIBs) have attracted increasing attention as an important alternative to lithium-ion batteries. Since development of PIBs is just at its infancy stage, suitable electrode materials are rather limited. We demonstrated Prussian blue K0.220Fe[Fe(CN)6]0.805 nanoparticles as a potential cathode material. It delivered a capacity of 74.5 mAh/g at 50 mA/g and a high discharge voltage of 3.1~3.4 V as well as excellent cycling stability with retention over 98% after 50 cycles. Ex-situ XRD, Raman, and XPS characterizations confirmed that the C-coordicated FeIII/FeII couple is the redox-active site and responsible for K+ storage. Furthermore, we presented a PIB full-cell by coupling the nanoparticles with commercial carbon materials. The full-cell delivered a capacity of 68.5 mAh g-1 at 100 mA g-1 and retained 93.4% of the capacity after 50 cycles. Our work highlights the potentials of future commercialization of PIBs owing to the low cost and sustainability of both electrode materials.

[1] C. Zhang, Y. Xu, M. Zhou, L. Liang, H. Dong, M. Wu, Y. Yang, Y. Lei, Adv. Funct. Mater. 2017, 1604307.