K‐Ion Battery Cathode Design Utilizing Trigonal Prismatic Ligand Field

The intrinsic physical and chemical properties of materials are largely governed by the bonding and electronic structures of their fundamental building units. The majority of cathode materials contain octahedral TMO6 (TM = transition metal), which dominates the redox chemistry during electrochemical...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2021-06, Vol.33 (24), p.e2101788-n/a
Main Authors: Wu, Nanzhong, Zhou, Xiaolong, Kidkhunthod, Pinit, Yao, Wenjiao, Song, Tianyi, Tang, Yongbing
Format: Article
Language:English
Subjects:
Batteries
cathode design
Cathodes
Chemical properties
Electrode materials
Fine structure
geometric and electronic structures
K‐ion batteries
Ligands
Material properties
Synchrotrons
TMO 6 motif
Transition metals
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Summary:The intrinsic physical and chemical properties of materials are largely governed by the bonding and electronic structures of their fundamental building units. The majority of cathode materials contain octahedral TMO6 (TM = transition metal), which dominates the redox chemistry during electrochemical operation. As a less symmetric form of TMO6, the trigonal prismatic geometry is not a traditionally favored coordination configuration as it tends to lose the crystal‐field stabilization energy and thus generate large ligand repulsion. Herein, a K‐ion battery cathode design, K2Fe(C2O4)2, is shown​, where the TMO6 trigonal prism (TP) is not only electrochemically active but stable enough to allow for excellent cycling stability. Detailed synchrotron X‐ray absorption spectroscopy measurements reveal the evolution of localized fine structure, evidencing the electrochemical activity, reversibility, and stability of the TP motif. The findings are expected to expand the toolbox for the rational design of electrode materials by taking advantage of TP as a structural gene. The electrochemistry of a trigonal‐prismatic (TP) TMO6 unit is revealed in a K‐ion battery cathode. The activity, reversibility, and stability of TP FeO6 based on comprehensive synchrotron X‐ray absorption spectroscopy analyses demonstrate it is a feasible structural gene for electrode design and exploration. Further materials lattice and electronic structure manipulation are expected.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202101788