Fluoride Ion Storage and Conduction Mechanism in Fluoride Ion Battery Positive Electrode, Ruddlesden–Popper-Type Layered Perovskite La_1.2Sr_1.8Mn₂O₇ Crystal

Abstract

for an allsolid-state fluoride ion battery positive electrode with a high volumetric capacity surpassing those of lithium-ion ones have been revealed using the Rietveld method and maximum entropy method. In La 1.2 Sr 1.8 Mn 2 O 7 , once the F − ions are taken into the NaCl slabs in its crystal through the charging process, it forms two stable fluoride compounds, La 1.