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Design and Synthesis of Cubic K~3−2~ ~x~ Ba ~x~ SbSe~4~ Solid Electrolytes for K–O~2~ Batteries by Jieren Shao; Huiling Ao; Lei Qin; Jocelyn Elgin; Curtis E. Moore; Yehia Khalifa; Songwei Zhang; Yiying Wu is a Engineering article available to read on EtoBox.

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## Abstract Developing K‐ion conducting solid‐state electrolytes (SSEs) plays a critical role in the safe implementation of potassium batteries. In this work, a chalcogenide‐based potassium ion SSE is reported, K~3~SbSe~4~, which adopts a trigonal structure at room temperature. Single‐crystal structural analysis reveals a trigonal‐to‐cubic phase transition at the low temperature of 50 °C, which is the lowest among similar compounds and thus provides easy access to the cubic phase. The substitution of barium for potassium in K~3~SbSe~4~ leads to the creation of potassium vacancies, expansion of lattice parameters, and a transformation from a trigonal phase to a cubic phase. As a result, the maximum conductivity of K~3−2~__~x~__Ba__~x~__SbSe~4~ reaches around 0.1 mS cm^−1^ at 40 °C for K~2.2~Ba~0.4~SbSe~4~, which is over two orders of magnitude higher than that of undoped K~3~SbSe~4~. This novel SSE is successfully employed in a K–O~2~ battery operating at room temperature where a polymer‐laminated K~2.2~Ba~0.4~SbSe~4~ pellet serves as a separator between the oxygen cathode and the potassium metal anode. Effective protection of the K metal anode against corrosion caused by O~2~ is de

Who reads Design and Synthesis of Cubic K~3−2~ ~x~ Ba ~x~ SbSe~4~ Solid Electrolytes for K–O~2~ Batteries?

Author

Jieren Shao; Huiling Ao; Lei Qin; Jocelyn Elgin; Curtis E. Moore; Yehia Khalifa; Songwei Zhang; Yiying Wu

Publisher

Wiley

Published

2023

Language

EN

Field

Engineering (Physical Sciences)