Electrochemical performance of La–Co–Sn alloys as anode materials for Li-ion batteries

✍ Scribed by G. Wang; Z.W. Lu; X.P. Gao; X.J. Liu; J.Q. Wang

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 892 KB
• Volume: 189
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2008.09.055

✦ Synopsis

Sn-rich La-Co-Sn ternary alloys were obtained by arc-melting process and subsequent ball-milling. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to determine the structure and morphology of the obtained alloys. In addition, the galvanoststic discharge/charge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were carried out to characterize the electrochemical properties of these alloys as anode materials for Li-ion batteries. It is found that all the as-cast La-Co-Sn ternary alloys have the same main phase of La 3 Co 4 Sn 13 and low electrochemical capacities. Among these alloys, the as-cast LaCoSn 4 alloy exhibits the best electrochemical performance. The ball-milling process results in the reduced cystallinity, and the enhanced electrochemical capacities as compared to the as-cast alloy. In particular, the LaCoSn 4 alloy, obtained after ball-milling for 16 h, provides the higher reversible discharge capacity and the better cycle stability.