Nason, Charlie AF;
Vijaya Kumar Saroja, Ajay P;
Ren, Wanjun;
Mei, Yingkangzi;
Sarguroh, Asma;
Han, Yupei;
Lu, Yi;
... Xu, Yang; + view all
(2025)
Enhanced ion intercalation in NiₓK₁₋₂ₓTiNbO₅ enabled by redox active Ni exchange for potassium-ion batteries.
Chemical Science
, 16
(41)
, Article 19140. 10.1039/d5sc04984a.
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Abstract
The ultimate goal of potassium-ion batteries (KIBs) is to become a serious competitor to lithium-ion batteries (LIBs). Achieving this requires the development of high energy density negative electrode materials, with transition metal oxides emerging as the most promising candidates. However, despite their high theoretical capacities, most transition metal oxides still struggle to achieve high performance, often necessitating substantial nanostructuring. Ion-exchange presents a facile and effective process for enhancing material properties, yet the demonstration of the exchanged ions undergoing redox activity has not been previously reported for KIBs. Herein, this work reports Ni0.25K0.5TiNbO5, synthesized through the ion-exchange between K+ and Ni2+, as a novel negative electrode material for KIBs. The ion-exchanged material achieves a specific capacity of 304 mAh g−1 in the first cycle and 162 mAh g−1 after 10 cycles, corresponding to a 240% and 156% increase compared to the pristine, unexchanged KTiNbO5 at the same cycle numbers. The structure–performance relationship was investigated in detail, shedding light on the previously unknown relationships between the level of hydration, degree of exchange and the performance of ion-exchanged materials. Furthermore, the exchanged Ni was demonstrated to be reversibly redox active, contributing to the observed capacity and representing a first for ion-exchanged materials in the KIB literature.
| Type: | Article |
|---|---|
| Title: | Enhanced ion intercalation in NiₓK₁₋₂ₓTiNbO₅ enabled by redox active Ni exchange for potassium-ion batteries |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d5sc04984a |
| Publisher version: | https://doi.org/ 10.1039/d5sc04984a |
| Language: | English |
| Additional information: | © The Author(s), 2025. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/ |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10216399 |
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