Iron disulphide molten salt electrochemical cells are among the most promising technological options for batteries. The electrochemical behaviour of pyrite allies excellent cathodic characteristics to optimal performance and low operational costs. The cathodic iron disulphide mechanism involves many processes, encompassing from polysulphides formation to the reduction of iron to the metallic state. The use of X-ray diffraction together with scanning electronic microscopy analysis on cells of the Li/KCl-LiCl/FeS 2 system made possible to identify intrinsic and extrinsic parameters to the electrochemical process involved in the establishment of the polysulphides stoichiometry. It is necessary to note that the augmentation of the cell's internal resistance and loss of electrical capacity are directly related with the formation of these same substances. Researches in the electrochemistry of these phenomena aim to elucidate the cathodic interphase processes and the effect of every reaction in the global mechanism.Keywords: pyrite; molten salts; thermal batteries.
IntroduçãoO comportamento eletroquímico da pirita vem apresentando crescente interesse devido as excelentes características catódicas, aliando requisitos de ótima performance e baixos custos operacionais, destacando-se o nível tóxico baixo e a facilidade de obtenção e manuseio. O dissulfeto de ferro pode ser obtido pela purificação da pirita mineral ou por métodos químicos na forma de pó. Nos
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