Résumé
To meet future energy demands, developing beyond-lithium energy storage technologies have become a major part of global research activities. Potassium-ion batteries (KIBs) represent a promising technology thanks to their chemical and economic advantages 1–3 . The majority of the work on layered transition oxide was done on the K x MnO 2 family 4,5 due to their safety and price advantage. Interestingly, KFeO 2 structure is not a layered structure as for LiFeO 2 or NaFeO 2 ; this structure is defined as FeO 4 tetrahedral linked by their corners. In electrochemistry, a reversible capacity of 60 mAh/g (for 0.3K + ) was delivers 6 . In our presentation, we will detail the electrochemical behaviour of KFeO 2 and discuss the structure/properties relationship of this family of materials, showing the interest in the exploration of such a system. Xu, Y. et al. 2023 roadmap for potassium-ion batteries. J. Phys. Energy 5 , 021502 (2023). Tian, Y. et al. Promises and Challenges of Next-Generation “Beyond Li-ion” Batteries for Electric Vehicles and Grid Decarbonization. Chem. Rev. 121 , 1623–1669 (2021). Zhang, W., Liu, Y. & Guo, Z. Approaching high-performance potassium-ion batteries via advanced design strategies and engineering. Sci. Adv. 5 , eaav7412 (2019). Kim, H. et al. Investigation of Potassium Storage in Layered P3-Type K0.5MnO2 Cathode. Adv. Mater. 29 , 1702480 (2017). Liu, C., Luo, S., Huang, H., Zhai, Y. & Wang, Z. Layered potassium-deficient P2- and P3-type cathode materials KxMnO2 for K-ion batteries. Chem. Eng. J. 356 , 53–59 (2019). Han, S. C., Park, W. B., Sohn, K.-S. & Pyo, M. KFeO2 with corner-shared FeO4 frameworks as a new type of cathode material in potassium-ion batteries. J. Solid State Electrochem. 23 , 3135–3143 (2019).