Investigation of K modified P2 Na 0.7 Mn 0.8 Mg 0.2 O 2 as a cathode material for sodium-ion batteries

dc.contributor.authorSehrawat, Den_AU
dc.contributor.authorCheong, Sen_AU
dc.contributor.authorRawal, Aen_AU
dc.contributor.authorGlushenkov, AMen_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorCowie, BCCen_AU
dc.contributor.authorGonzalo, Een_AU
dc.contributor.authorRojo, Ten_AU
dc.contributor.authorNaeyaert, PJPen_AU
dc.contributor.authorLing, CDen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorSharma, Nen_AU
dc.description.abstractSodium-ion batteries (NIBs) are emerging as a potentially cheaper alternative to lithium-ion batteries (LIBs) due to the larger abundance of sodium and in some cases the similar intercalation chemistry to LIBs. Here we report the solid state synthesized K-modified P2 Na0.7Mn0.8Mg0.2O2 which adopts hexagonal P63/mmc symmetry. The second charge/discharge capacity for the as-prepared material is 115/111 mA h g−1 between 1.5–4.2 V at a current density of 15 mA g−1, which reduces to 61/60 mA h g−1 after 100 cycles. Scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy (STEM-EDS) analysis shows a heterogeneous distribution of K and solid state 23Na NMR illustrates that the presence of K perturbs the local environment of Na within the P2 Na0.7Mn0.8Mg0.2O2 crystal structure. Larger scale X-ray absorption near-edge structure (XANES) data on the K L-edge also illustrate that K is present on the surface of electrodes in preference to the bulk. In situ synchrotron X-ray diffraction (XRD) data illustrates that the P2 structural motif is preserved, featuring a solid solution reaction for most of charge–discharge except at the charged and discharged states where multiple phases are present. The K-modified sample of P2 Na0.7Mn0.8Mg0.2O2 is compared with the K-free samples in terms of both structural evolution and electrochemical performance. © The Royal Society of Chemistry 2019en_AU
dc.identifier.citationSehrawat, D., Cheong, S., Rawal, A., Glushenkov, A. M., Brand, H. E. A., Cowie, B., Gonzalo, E., Rojo, T., Naeyaert, P. J. P., Ling, C. D., Avdeev, M., & Sharma, N. (2019). Investigation of K modified P2 Na 0.7 Mn 0.8 Mg 0.2 O 2 as a cathode material for sodium-ion batteries. CrystEngComm, 21(1), 172-181. doi:10.1039/C8CE01532Een_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectSodium ionsen_AU
dc.subjectElectric batteriesen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectCrystal structureen_AU
dc.subjectSolid solutionsen_AU
dc.subjectPhase transformationsen_AU
dc.titleInvestigation of K modified P2 Na 0.7 Mn 0.8 Mg 0.2 O 2 as a cathode material for sodium-ion batteriesen_AU
dc.typeJournal Articleen_AU
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
1.63 KB
Item-specific license agreed upon to submission