Journal
BATTERIES & SUPERCAPS
Volume 3, Issue 5, Pages 450-455Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.201900170
Keywords
polyanionic compound; amorphous KFePO4; C; electrochemically active; high reversibility; potassium-ion batteries
Funding
- School of Materials and Energy, Guangdong University of Technology, P.R. China
- Australian Research Council (ARC) Discovery & Linkage projects
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Pristine KFePO4 is electrochemically inactive towards potassium, which suggests that K+ ion migration is unfavorable in the KFePO4 structure. Therefore, it is a challenge to create a reactive structure of KFePO4 towards reversible potassium insertion/extraction. In this study, we have fabricated reactive KFePO4 phase by adopting high-energy ball milling technique where tiny nanoparticles (similar to 1.0-1.5 nm) of KFePO4 are created and embedded in the Super P carbon black matrix, which provides conductivity and helps to stabilize the electrode structure. The combination of nano-sizing and the conductive matrix appears to activate electrochemical reactivity. The obtained carbon incorporated KFePO4 material appears to be amorphous. The electrode produces an average operational potential of similar to 2.5 V (vs K+/K) with high capacity retention of 90 mAh g(-1). It is anticipated that this work could pave the way for further studies on cathodes and generate huge attention to the role of ball milling and particle size control on electrochemical activity of KFePO4 materials for the development of PIBs.
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