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Mechanochemically synthesized pyrite and its electrochemical behavior as cathode for lithium batteries

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This study presents a simple and scalable synthesis of pyrite (FeS2) starting from S and Fe powders, which involves high-energy ball milling of precursor powders followed by a thermal treatment.… Click to show full abstract

This study presents a simple and scalable synthesis of pyrite (FeS2) starting from S and Fe powders, which involves high-energy ball milling of precursor powders followed by a thermal treatment. The formation of the desired product was confirmed by X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. After the synthesis, spherical FeS2 nanoparticles of ~ 85 nm in size were obtained, with a highly crystalline face-centered cubic structure and no secondary phases. The synthesized material was tested as cathode material for lithium batteries. The cathodes delivered good electrochemical lithium storage properties, such as a reversible capacity as high as 470 mAh g−1 even after 120 cycles and a good rate capability. Furthermore, aspects regarding the reaction mechanism and common electrochemical features of Li/FeS2 batteries are discussed.

Keywords: pyrite electrochemical; synthesized pyrite; lithium batteries; lithium; mechanochemically synthesized; spectroscopy

Journal Title: Journal of Solid State Electrochemistry
Year Published: 2019

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