High voltage Mg-doped Na0.67Ni0.3-xMgxMn0.7O2 (x = 0.05, 0.1) Na-ion cathodes with enhanced stability and rate capability

By Gurpreet Singh, N. Tapia‐Ruiz, J. L. Amo, U. Maitra, J. W. Somerville, A. Armstrong, Jaione Martinez de Ilarduya, Teo, lo Rojo, P. Bruce. 2016

286 citations recorded by the source corpus.

Magnesium substituted P2-structure Na0.67Ni0.3Mn0.7O2 materials have been prepared by a facile solid-state method and investigated as cathodes in sodium-ion batteries. The Mg-doped materials described here were characterized by X-ray diffraction (XRD), 23Na solid-state nuclear magnetic resonance (SS-NMR), and scanning electron microscopy (SEM). The electrochemical performance of the samples was tested in half cells vs Na metal at room temperature. The Mg-doped materials operate at a high average voltage of ca. 3.3 V vs Na/Na+ delivering specific capacities of ∼120 mAh g–1, which remain stable up to 50 cycles. Mg doping suppresses the well-known P2–O2 phase transition observed in the undoped composition by stabilizing the reversible OP4 phase during charging (during Na removal). GITT measurements showed that the Na-ion mobility is improved by 2 orders of magnitude with respect to the parent P2–Na0.67Ni0.3Mn0.7O2 material. The fast Na-ion mobility may be the cause of the enhanced rate performance.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/b8436c8d8f940d08f5821504bfc56acb770e48f1

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Citations in the corpus

Rational design of layered oxide materials for sodium-ion batteries (2020, background): “However, replacing Ni 2+ with Mg in P2-Na2/3Ni1/3Ti2/3O2, facilitated by their similar ionic radii(16), leads to Na2/3Mg1/3Ti2/3O2 for which the cationic potential predicts the O3-type structure, which is difficult to predict even with complex electrostatic energy calculations(15).”