Characterization of Li2FeS2 from Li/FeS2 Electrochemical Systems

Abstract

This work surveys the complex and multi-phase discharge mechanism of Li/Fe₂S thermal batteries looking into the morphology and response to the current density of the main intermediary compounds of this electrochemical cathodic system, namely Li₂FeS₂. Discharged cells of high power density battery were submitted to examination and characterization through SEM/EDS analysis. Those analyses allowed access to the materials distribution layers discrimination together identification of the cathodic interface. The work wraps-up concluding needle-like-structures, characteristic of the Li₂FeS₂ compound, have their growth closely related to the current density drained from the battery. The elucidation of these phenomena will bridge the understanding of the cathodic mechanism leading to the optimization of this system.