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Glibo, Albina
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article
Synthesis and comparative performance study of crystalline and partially amorphous nano-sized SnS2 as anode materials for lithium-ion batteries
Abstract
<p>A facile, time effective, and energy efficient precipitation reaction method was developed to synthesize amorphous/nano crystalline SnS<sub>2</sub> using SnCl<sub>4</sub>·5H<sub>2</sub>O and thioacetamide (C<sub>2</sub>H<sub>5</sub>NS) as Sn and S sources, respectively. As a comparison, nano-crystalline SnS<sub>2</sub> was also synthesized via the already established hydrothermal method using the same Sn- and S precursors. The crystal structure, chemical composition, and morphology of both obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The electrochemical performance properties of the as-synthesized SnS<sub>2</sub> samples were investigated using galvanostatic cycling with potential limitation, cyclic voltammetry, electrochemical impedance spectroscopy and electrochemical in-situ dilatometry. The results show that SnS<sub>2</sub> prepared via the precipitation reaction method electrochemically outperforms that from the hydrothermal method. This is due to the formation of thicker Li<sub>2</sub>S layers on the particle surfaces, which drastically limits the volume expansion of the Sn particles during the alloying reaction with lithium.</p>