title: A comparative study of layered transition metal oxide cathodes for application in sodium-ion battery.
abstract: Herein, we report a study on P-type layered sodium transition metal-based oxides with a general formula of NaxMO2 (M = Ni, Fe, Mn). We synthesize the materials via coprecipitation followed by annealing in air and rinsing with water, and we examine the electrodes as cathodes for sodium-ion batteries using a propylene carbonate-based electrolyte. We fully investigate the effect of the Ni-to-Fe ratio, annealing temperature, and sodium content on the electrochemical performances of the electrodes. The impact of these parameters on the structural and electrochemical properties of the materials is revealed by X-ray diffraction, scanning electron microscopy, and cyclic voltammetry, respectively. The suitability of this class of P-type materials for sodium battery application is finally demonstrated by cycling tests revealing an excellent electrochemical performance in terms of delivered capacity (i.e., about 200 mAh g(-1)) and charge-discharge efficiency (approaching 100%).
authors.affiliation: Department of Chemistry, Sapienza University of Rome , Piazzale Aldo Moro, 5, 00185 Rome, Italy.
authors.forename: Ivana
authors.initials: I
authors.lastname: Hasa
authors.forename: Daniel
authors.initials: D
authors.lastname: Buchholz
authors.forename: Stefano
authors.initials: S
authors.lastname: Passerini
authors.forename: Jusef
authors.initials: J
authors.lastname: Hassoun
keywords: NaxMO2 (M = Ni,Fe,Mn); P2−P3-type layered structure; battery; cathode; sodium-ion