DOI: 10.3724/SP.J.1077.2014.13514

Journal of Inorganic Materials (无机材料学报) 2014/29:7 PP.747-752

Hydrothermal Preparation and Electrochemical Properties of Co-S alloys

The Co-S alloys were prepared by a hydrothermal method and the process parameters were optimized. The surface morphology and phase structure of Co-S alloys were characterized by SEM and XRD. The electrochemical properties of Co-S alloys were investigated by galvanostatic charge and discharge tests, cyclic voltammetry and AC impedance. The results indicated that the as-prepared Co-S alloy, which was synthesized using a 70% packing volume of the reaction solution at 160℃ for 12 h, showed good crystallinity. This alloy consisted of metallic Co and Co9S8 phases with a cross-linked lamellar morphology of about 50 nm in thickness. It possessed a maximum discharge capacity of 536 mAh/g at charge and discharge current density of 150 mA/g and a good cycling stability with capacity retention rate of 77.4% after 50 cycles. The redox reactions between Co and Co(OH)2 were the main reaction during charge and discharge. Partial dissolution of Co reduced the active material and led to capacity decay.

Key words:hydrothermal method,Co-S alloy,process parameters,electrochemical properties

ReleaseDate:2016-07-11 11:25:04

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