Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Materials for Energy Storage

KFM 9.7: Vortrag

Dienstag, 2. April 2019, 12:10–12:30, PHY 5.0.21

Tungsten sulfide: An intercalation-type anode material for potassium-ion battery — •Yuhan Wu, Yang Xu, Chenglin Zhang, and Yong Lei — Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

The intercalation-type materials have rarely been discovered as anodes for potassium-ion batteries (PIBs) except graphite and conventional transition metal oxides. Here we reported the first two-dimensional transition metal dichalcogenide (2D TMD), WS2, as an intercalation-type anode material for PIBs. It is found for the first time that the WS2 undergoes an unexpected intercalation dominated K storage at deep-discharge condition (0.01 V vs. K+/K), attributing to the facilitation of K+ transport derived from the intercalation reaction that is confirmed by a kinetic study. Electrochemical characterizations reveal that WS2 exhibited a reversible capacity of 103 mAh/g at 0.1 A/g after 100 cycles. It also delivered a high rate capability (62 mAh/g at 0.8 A/g) and long-term stability at high rate (90% retention at 0.5 A/g after 400 cycles). Furthermore, a full-cell with intercalation-type WS2 as anode and Prussian blue as cathode exhibited a charge plateau around 3.3 V and a discharge slope between 1.5 and 3.2 V, delivering a reversible capacity of 60 mAh/g at 0.1 A/g after 50 cycles. This work highlights the unusual electrochemical properties when replacing Li+ and Na+ with K+ for the battery application, and may induce more future work in this regard.