| 三维多孔Sn-Co合金负极制备及其电化学性能研究 |
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| 引用本文： | 薛连杰,黄令,柯福生,魏国祯,郑小美,李君涛,樊小勇,孙世刚.三维多孔Sn-Co合金负极制备及其电化学性能研究[J].电化学,2010,16(2):161. |
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| 作者姓名： | 薛连杰 黄令 柯福生 魏国祯 郑小美 李君涛 樊小勇 孙世刚 |
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| 作者单位： | 厦门大学化学化工学院化学系;厦门大学固体表面物理化学国家重点实验室; |
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| 摘 要： | 采用化学镀方法制备三维多孔铜.以其作为集流体,借助电沉积制备三维多孔Sn-Co合金电极.X-射线衍射(XRD),扫描电镜(SEM)分析表明,以多孔铜为集流体制备的SnCo合金电极主要存在CoSn2相和纯Sn相,为三维多孔结构.充放电结果显示,三维结构SnCo合金电极比平面铜集流体上镀得的SnCo合金电极表现出更优越的充放电性能.前者的首次放电(嵌锂)容量为636.3mAh/g,充电(脱锂)容量为528.7mAh/g,首次库仑效率为83.1%,70周后容量为529.5mAh·g-1,保持率为82.6%.此外,还应用电化学阻抗初步研究了三维Sn-Co合金电极在充放电过程发生的嵌脱锂过程.
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| 关 键 词： | 多孔铜 锂离子电池 Sn-Co合金 负极 电化学阻抗谱 |
| 收稿时间： | 2010-05-28 |
Preparation and Electrochemical Performance of Three-Dimensional Porous SnCo Alloy Electrode |
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| Abstract: | Three-dimensional porous Cu film was prepared by electroless plating,and used as a current collector for preparation of three-dimensional structured SnCo alloy electrode,which was mainly prepared by an electrodeposition method,and composed of pure Sn and CoSn2 phases. Electrochemical experimental results show that three-dimensional structured SnCo alloy electrode exhibits much better cycleability than planar SnCo alloy electrode,with first discharge capacity and charge capacity of 636. 3 and 528. 7 mAh·g-1,respectively. After 70th cycling,capacity retention is 83. 1% with 529. 5 mAh·g-1. The lithiation process during first discharge was investigated by electrochemical impedance spectroscopy |
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| Keywords: | porous Cu lithium ion batteries SnCo alloy electrode anode electrochemical impedance spectroscopy |
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