Synthesis, Structure and Ion Conduction of Potassium Carbazolides for Potassium Ionic 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 aroused worldwide interest due to the limited lithium resource. However, the lack of electrolytes with high ionic conductivity and interfacial stability is the major obstacle for the development of all solid-state potassium-ion batteries. In this work, a new phase of potassium carbazolide (KC12H8N, β-KCZ) was synthesized and expected to be less rigid in the stacking layers than the reported α-KCZ, indicating weaker cation−π interactions. Upon complexing KCZ with THF, a new type of potassium solid-state electrolyte was successfully developed, particularly, an optimized composition K0.9CZ-0.7THF with electrochemical stability window of 3.0 V can achieve 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. It exhibits outstanding interfacial stability and compatibility against K2S electrode in 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 our knowledge, this is the first report that a potassium organic compound was employed as potassium solid-state electrolyte.

Citation

Advanced Functional Materials

Pub Type

Journals

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 Ionic Solid-State Electrolytes, Advanced Functional Materials (Accessed October 19, 2024)