The Quest for Stable Potassium‐Ion Battery Chemistry

Wu, Xianyong; Qiu, Shen; Liu, Yao; Xu, Yunkai; Jian, Zelang; Yang, Jihui; Ji, Xiulei; Liu, Jun

doi:10.1002/adma.202106876

Title: The Quest for Stable Potassium‐Ion Battery Chemistry

Journal Article · Fri Dec 10 00:00:00 EST 2021 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202106876· OSTI ID:1835390

Wu, Xianyong ^[1]; Qiu, Shen ^[2]; Liu, Yao ^[2]; Xu, Yunkai ^[3]; Jian, Zelang ^[3]; Yang, Jihui ^[2]; Ji, Xiulei ^[3];

^[4]

Materials Science and Engineering Department University of Washington Seattle WA 98105 USA, Department of Chemistry Oregon State University Corvallis OR 97331 USA
Materials Science and Engineering Department University of Washington Seattle WA 98105 USA
Department of Chemistry Oregon State University Corvallis OR 97331 USA
Materials Science and Engineering Department University of Washington Seattle WA 98105 USA, Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99252 USA

Abstract Potassium‐ion batteries (KIBs) have attracted wide interest for energy storage because of the abundance of the electrode materials involved; however, their electrochemical performances are far behind what can be achieved from lithium‐ion batteries (LIBs) or sodium‐ion batteries (SIBs). Herein, key promising electrode and electrolyte materials for potassium‐ion batteries are identified, the coupled electrochemical reactions in the cell are investigated, and the compatibility between different materials is demonstrated to play the most important role. K ₂ Mn[Fe(CN) ₆ ] cathode can deliver a high capacity of ≈125 mAh g ⁻¹ and exceptional cycling stability over 61 000 cycles (≈9 months) if the side reactions from the anode can be prevented. Graphite is a good anode material but is subjected to degradation in traditional carbonate electrolytes. New concentrated electrolytes are developed and evaluated. A stable KIB system is demonstrated by coupling a stable K ₂ Mn[Fe(CN) ₆ ] cathode, a prepotassiated graphite anode with a concentrated electrolyte to achieve a high energy density of ≈260 Wh kg ⁻¹ (based on the active mass of cathode and anode) and good cycling of over 1000 cycles.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC05‐76RLO1830

OSTI ID:: 1835390

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Vol. 34 Journal Issue: 5; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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