Nano-Sized SnSbAgx Alloy Anodes Prepared by Reductive Co-Precipitation Method Used as Lithium-Ion Battery Materials
Abstract:Nano-sized SnSbAgx alloy anode materials are prepared by reductive co-precipitation method combining with the aging treatment in water bath at 80 °C. The microstructure, morphology and electrochemical properties of synthesized SnSbAgx alloy powders are evaluated by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), galvanostatical cycling tests and electrochemical impedance spectroscopy (EIS). The XRD results indicate that the phases are composed of -Sn, Sb, Ag3Sb, Ag3Sn and SnSb in the SnSbAgx alloy. The existence of inactive element Ag and the complex multi-step reaction mechanism in SnSbAgx alloy anodes are propitious to improve the structure stability and thus improve the cycling performance. When cycled at a constant current density of 0.1 mA·cm−2 between 0.1 and 1.50 V, SnSbAg alloy shows better performance that the first discharge capacity is 794 mAh·g−1 and the reversible capacity of 20th cycle attains to 327 mAh·g−1. EIS results show that the semicircle relates to the passivation on the surface in the higher frequency zone and the bias relates to the diffusion in the lower frequency zone.
Document Type: Research Article
Publication date: November 1, 2010
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