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NaNi1/3Fe1/3Co1/3O2 is synthesized by solid-state methods and investigated as a positive electrode material for sodium ion batteries. Galvanostatic cycling of NaNi1/3Fe1/3Co1/3O2 between 2.0 and 4.2 V provides ~ 165 mAh/g of reversible capacity at C/20. This material also demonstrates great rate-capability and is able to de-intercalate 80 mAh/g even at 30C. First principles calculations are used to determine the order of transition metal oxidation within the system and provide lattice parameters with close proximity to the experimental.
Vassilaras et al. (Thu,) studied this question.