Somerville, James W. and House, Rob A and Tapia-Ruiz, Nuria and Sobkowiak, Adam and Ramos, Silvia and Chadwick, Alan V. and Roberts, Matthew R. and Maitra, Urmimala and Bruce, Peter G. (2018) Identification and characterisation of high energy density P2-type Na2/3[Ni1/3−y/2Mn2/3−y/2Fey]O2 compounds for Na-ion batteries. Journal of Materials Chemistry. ISSN 0959-9428
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Abstract
The composition space between MnO2, NaFeO2, and Na[Ni1/2Mn1/2]O2 has been explored with the goal of identifying Earth-abundant single-phase P2 cathode materials. This has led to the identification of two compounds, P2-Na2/3[Ni1/3−y/2Mn2/3−y/2Fey]O2 (y = 1/6, 1/3) which exhibit state of the art specific energies. These materials were further evaluated through galvanostatic cycling and X-ray absorption spectroscopy.