Synthesis, Structure, and Ion Conduction of Potassium Carbazolides for Potassium Ion Solid‐State Electrolytes

Published

September 20, 2024

Author(s)

Jiaquan Guo, Yang Yu, Khai Chen Tan, Qijun Pei, Zhao Li, Yuting Wang, Alexis Munyentwali, Hui Wu, Teng He, Ping Chen

Abstract

Potassium ion batteries gradually have aroused worldwide interest due to the limited lithium resource. However, the research on the solid-state potassium-ion batteries is at its very early stage. The lack of electrolytes with high ionic conductivity and interfacial stability is the major obstacle. In this work, a new phase of potassium carbazolide (KC12H8N, -KCZ) is synthesized and expected to be less rigid in the stacking layers than the reported -KCZ, indicating weaker cation− interactions. Upon complexing KCZ with THF, a new type of potassium solid-state electrolyte is successfully developed (KxCZ-yTHF), particularly, an optimal composition K0.9CZ-0.7THF reveals an ionic conductivity as high as 4.2 × 10−4 S cm−1 at 100 °C, which is among the top K+ conductors at this temperature. Furthermore, KxCZ-yTHF also demonstrates a remarkable electrochemical stability window of 3.1 V, as well as outstanding interfacial stability and compatibility against K2S electrode during a 400-h electrochemical cycling test. Other advantages of this electrolyte include cold pressing for molding, ease for scaling up, and high safety upon exposure to air. To the best of the knowledge, this is the first report that a potassium organic compound is employed as potassium solid-state electrolyte.

Citation

Advanced Functional Materials

Volume

35

Issue

1

Pub Type

Journals

Download Paper

https://doi.org/10.1002/adfm.202412005

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Keywords

potassium solid-state electrolyte, potassium-ion battery, fast ion conduction, potassium carbazolide

Citation

Guo, J. , Yu, Y. , Chen Tan, K. , Pei, Q. , Li, Z. , Wang, Y. , Munyentwali, A. , Wu, H. , He, T. and Chen, P. (2024), Synthesis, Structure, and Ion Conduction of Potassium Carbazolides for Potassium Ion Solid‐State Electrolytes, Advanced Functional Materials, [online], https://doi.org/10.1002/adfm.202412005, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958404 (Accessed October 27, 2025)