Titanium-based potassium-ion battery positive electrode with extraordinarily high redox potential

The rapid progress in mass-market applications of metal-ion batteries intensifies the development of economically feasible electrode materials based on earth-abundant elements. Here, we report on a record-breaking titanium-based positive electrode material, KTiPO 4 F, exhibiting a superior electrode...

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Published in:Nature communications 2020-03, Vol.11 (1), p.1484-1484, Article 1484
Main Authors: Fedotov, Stanislav S., Luchinin, Nikita D., Aksyonov, Dmitry A., Morozov, Anatoly V., Ryazantsev, Sergey V., Gaboardi, Mattia, Plaisier, Jasper R., Stevenson, Keith J., Abakumov, Artem M., Antipov, Evgeny V.
Format: Article
Language:English
Subjects:
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Anions
Coated electrodes
Electrochemistry
Electrode materials
Electrode potentials
Electrodes
Humanities and Social Sciences
Ion migration
Lithium
Metal ions
multidisciplinary
Playgrounds
Potassium
Rechargeable batteries
Redox potential
Science
Science (multidisciplinary)
Titanium
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Summary:The rapid progress in mass-market applications of metal-ion batteries intensifies the development of economically feasible electrode materials based on earth-abundant elements. Here, we report on a record-breaking titanium-based positive electrode material, KTiPO 4 F, exhibiting a superior electrode potential of 3.6 V in a potassium-ion cell, which is extraordinarily high for titanium redox transitions. We hypothesize that such an unexpectedly major boost of the electrode potential benefits from the synergy of the cumulative inductive effect of two anions and charge/vacancy ordering. Carbon-coated electrode materials display no capacity fading when cycled at 5C rate for 100 cycles, which coupled with extremely low energy barriers for potassium-ion migration of 0.2 eV anticipates high-power applications. Our contribution shows that the titanium redox activity traditionally considered as “reducing” can be upshifted to near-4V electrode potentials thus providing a playground to design sustainable and cost-effective titanium-containing positive electrode materials with promising electrochemical characteristics. The Ti 4+ /Ti 3+ redox couple is usually a good choice for anodes due to its low potential. Here, the authors show that the potential can be increased to nearly 4.0 V in KTiPO 4 F, which serves as a high-performance cathode for K-ion batteries.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-15244-6