| In this work, the developments of lithium-ion battery and anode materials were reviewed. At present, carbon materials have been used as anodic materials in Li-ion batteries, but the development of electric vehicles and electronic devices presents higher demands to anodic materials in capacity, safty, cost, stability etc. The research and development of anodic materials has been focused on and Tin-based alloy anodic material is a alternative candidates. Tin-based alloy film materials were prepared by magnetron sputtering method, and X-ray diffraction (XRD), scanning electron microscop (SEM) and electrochemical measurements have been carried out to determine the structure and morphology, and electrochemical properties of these samples.Sn film electrode showed initial discharge capacity, 823 mAh/g and coulomb efficiency 92.7% at the first cycle, but the capacity decay was severe at the following cycling. After heat-treatment, a Cu3Sn intermetallic compound was formed in the sample, which showed better cycle life, but low first cycle capacity and coulomb efficiency. The discharge capacity of hest-treated Sn eldctrode was 470 mAh/g for the first cycle, and the coulomb efficiency was 76.8%.A ternary Cu-Sn-Zn film was prepared by magnetron sputtering method and followed heat-treatment. A Cu3Sn intermetallic composite was formed after heat-treatment, and the adhesion between SnZn layer and Cu substrate was improved. The SEM result showed that the alloy film was composed of alloy particles with the size of around 5μm, and the alloy particle was composed of smaller particles with size of around 50 nm. The alloy film anode showed high charge-discharge capacity and columbic efficiency, and good cyclic stability. The discharge capacity remained over 300 mAh·g-1 after 200 cycles, the columbic efficiency was over 98.0%. These results should be attributed to the unique structure of the alloy film anode composed of intermetallic composite, thin film and nano-sized active materials. |
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