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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Na2.4Al0.4Mn2.6O7 anionic redox cathode material for sodium ion batteries - a combined experimental and theoretical approach to elucidate its charge storage mechanism Cindy Soares , Begoña Silvan , Yong-Seok Choi , Veronica Celorrio , Giannantonio Cibin , David O. Scanlon , Nuria Tapia-Ruiz Journal Of Materials Chemistry A DOI: 10.1039/D1TA05137G Diamond Proposal Number(s): [21847] Open Access Show Abstract ▼ Abstract: Here we report the synthesis via ceramic methods of the high-performance Mn-rich Na2.4Al0.4Mn2.6O7 oxygen-redox cathode material for Na-ion batteries which we use as a testbed material to study the effects of Al substitution and subsequent Na excess in the high-capacity, anionic redox-based cathode material Na2Mn3O7. The material shows a stable electrochemical performance, with a specific capacity of 200 mAh g-1 in the 1.5 - 4.7 voltage window at C/20 and capacity retention of 90 % after 40 cycles. Using a combination of electrochemical and structural analysis together with hybrid density functional theory calculations we explain the behaviour of this material with changes in Mn/anionic redox reactions and associated O2 release reactions occurring in the material during electrochemical cycling (Na insertion/extraction) and compare these findings to Na2Mn3O7. We expect that these results will advance understanding of the effect of dopants in Mn-rich cathode materials with oxygen redox activity to pave their way towards real applications in high-performing sodium-ion battery applications.	Dec 2021

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B18-Core EXAFS

Na2.4Al0.4Mn2.6O7 anionic redox cathode material for sodium ion batteries - a combined experimental and theoretical approach to elucidate its charge storage mechanism

Cindy Soares , Begoña Silvan , Yong-Seok Choi , Veronica Celorrio , Giannantonio Cibin , David O. Scanlon , Nuria Tapia-Ruiz

Journal Of Materials Chemistry A

DOI: 10.1039/D1TA05137G

Diamond Proposal Number(s): [21847]