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

Stanislav S. Fedotov (), Nikita D. Luchinin, Dmitry A. Aksyonov, Anatoly V. Morozov, Sergey V. Ryazantsev, Mattia Gaboardi, Jasper R. Plaisier, Keith J. Stevenson, Artem M. Abakumov and Evgeny V. Antipov
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Stanislav S. Fedotov: Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology
Nikita D. Luchinin: Lomonosov Moscow State University
Dmitry A. Aksyonov: Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology
Anatoly V. Morozov: Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology
Sergey V. Ryazantsev: Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology
Mattia Gaboardi: Elettra Sincrotrone Trieste S.C.p.A, Area Science Park
Jasper R. Plaisier: Elettra Sincrotrone Trieste S.C.p.A, Area Science Park
Keith J. Stevenson: Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology
Artem M. Abakumov: Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology
Evgeny V. Antipov: Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract 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, KTiPO4F, 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.

Date: 2020
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DOI: 10.1038/s41467-020-15244-6

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