WANG Hong,WU Yunwen,LI Ming,et al.Electrodeposition of Si-Sn Alloy Anode for Lithium-Ion Batteries[J].Plating & Finishing,2020,(7):1-6.[doi:10.3969/j.issn.1001-3849.2020.07.0010]
锂电池硅锡合金负极的电沉积制备
- Title:
- Electrodeposition of Si-Sn Alloy Anode for Lithium-Ion Batteries
- 文献标志码:
- A
- 摘要:
- 采用恒电位共沉积方法从有机溶剂中制备不同Sn含量的Si-Sn合金负极，在100 mA/cm2的电流下进行100次充放电循环后，仍具有0.151 mAh/cm2的高面积比容量，比Si负极提升了73%。X射线衍射结果表明Si-Sn合金中Sn为β-Sn，Sn颗粒的嵌入不仅使Si-Sn合金负极比电沉积Si负极具有更好的导电性，提升了单位面积Si、Sn的沉积量；而且缓解了非晶Si的体积效应，从而提高了循环性能。不同Sn含量的容量曲线表明5%Sn含量的Si-Sn合金比容量最高，在500次循环后仍能保持859 mAh/g。
- Abstract:
- Si-Sn alloy anodes with different proportion of Sn is prepared by constant potential co-deposition method from organic solvents. After 100 charge and discharge cycles at a current of 100 mA/cm2, its large capacity is able to attain 0.151 mAh/cm2, 73% higher than Si anode. X-ray diffraction results show that Sn in the Si-Sn alloy is β-Sn. Sn particles embedded Si anode has a lower resistance than Si composite anode, which enhances the deposition amount of Si and Sn the Sn particles stabilizes the amorphous Si which improves cycle performance. The capacity curves of different proportion of Sn show that the Si-Sn alloy with 5% Sn has the highest specific capacity (859 mAh/g) after 500 cycles.
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备注/Memo
收稿日期： 2019-12-18；修回日期： 2020-01-03
通信作者： 杭弢，hangtao@sjtu.edu.cn
基金项目： 国家自然科学基金资助项目（21972091）