New Cathode Materials in the Fe-PO₄ -F Chemical Space for High-Performance Sodium-Ion Storage.

ABSTRACT: Sodium and iron make up the perfect combination for the growing demand for sustainable energy storage systems, given the natural abundance and sustainability of the two building block elements. However, most sodium-iron electrode chemistries are plagued by intrinsic low energy densities with continuous ongoing efforts to solve this. Herein, the chemical space of a series of (meta)stable, off-stoichiometric Fe-PO₄ -F phases is analyzed. Some are found to display markedly improved electrochemical activity for sodium storage, as compared to the amorphous or thermodynamically stable phases of equivalent composition. The metastable crystalline Na_1.2 Fe_1.2 PO₄ F_0.6 delivers a reversible capacity of more than 140 mAh g^-1 with an av

SUBMITTER: Liu X 

PROVIDER: S-EPMC9353465 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature