Manipulating O3/P2 phase ratio in bi-phasic sodium layered oxides via ionic radius control
Date
02/02/2023Grant ID
ep/l017008/1
ep/l017008/1
EP/T019298/1
EP/T005602/1
Metadata
Show full item recordAbstract
Bi-phasic O3/P2 sodium layered oxides have emerged as leading candidates for the commercialisation of next-generation sodium-ion batteries. However, beyond simply altering the sodium content, rational control of the O3/P2 ratio in these materials has proven particularly challenging despite being crucial for the realization of high-performance electrode materials. Here, using abundant elements, we manipulate the O3/P2 ratio using the average ionic radius of the transition metal layer and different synthesis conditions. These methods allow deterministic control over the O3/P2 ratio, even for constant Na contents. In addition, tuning the O3/P2 ratio yields high-performing materials with different performance characteristics, with a P2-rich material achieving high rate capabilities and excellent cycling stability (92% retention, 50 cycles), while an O3-rich material displayed an energy density up to 430 Wh kg−1, (85%, 50 cycles). These insights will help guide the rational design of future high-performance materials for sodium-ion batteries.
Citation
Maughan , P A , Naden , A B , Irvine , J T S & Armstrong , A R 2023 , ' Manipulating O3/P2 phase ratio in bi-phasic sodium layered oxides via ionic radius control ' , Communications Materials , vol. 4 , no. 1 , 6 . https://doi.org/10.1038/s43246-023-00337-8
Publication
Communications Materials
Status
Peer reviewed
ISSN
2662-4443Type
Journal article
Description
Funding: This work was supported by the Faraday Institution (Grant number FIRG018). The authors would like to thank Dr. David Rochester at Lancaster University for conducting the ICP-OES experiments. A.B.N. would like to acknowledge funding by the Engineering and Physical Sciences Research Council under grant numbers EP/L017008/1, EP/R023751/1, and EP/T019298/1 for the electron microscopy analysis.Collections
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