Nano-Sized SnSbAgx Alloy Anodes Prepared by Reductive Co-Precipitation Method Used as Lithium-Ion Battery Materials
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.
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Document Type: Research Article
Publication date: 2010-11-01
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