| 非晶态Fe-P合金电极的电沉积制备及其储锂性能 |
| Electrodeposition and Lithium Storage Performance of Amorphous Fe-P Alloy Electrodes |
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| 摘要: 应用电沉积技术制备了Fe-P合金电极材料。采用X射线衍射(XRD)和扫描电子显微镜(SEM)分析了该合金材料的相结构和表面形貌。XRD分析结果表明电沉积的Fe-P合金具有非晶态结构。电化学性能测试表明：平面结构的Fe-P合金电极首次放电(脱锂)容量达542 mAh·g-1，首次循环的库仑效率为60%；50周循环之后放电容量为366 mAh·g-1。用非原位的XRD和SEM对电极的充放电机理进行了初步研究，结果表明，首次充电(嵌锂)过程中形成Li3P相，电极表面生成纳米棒结构铁-磷合金，它能有效缓解锂嵌入/脱出时引起的合金结构变化，抑制合金材料的体积膨胀，从而提高该合金电极的充放电效率和循环性能。 |
| 关键词: 电沉积 锂离子电池 非晶态 Fe-P合金电极 |
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| Abstract: The planar structural Fe-P alloy deposits were prepared by electroplating. The structure and electrochemical performance of the electroplated Fe-P alloys have been investigated in detail. XRD results showed that Fe-P alloy deposit exhibits an amorphous state. Electrochemical tests showed that the Fe-P alloy composite electrodes can deliver a discharge capacity of 542 mAh·g-1 in the first cycle and the coulombic efficiency of 60%. At the 50th cycle the discharge capacity was 366 mAh·g-1. The Fe-P electrodes with nanorods structure obtained during cycling was beneficial in reducing the irreversible capacity of Fe-P alloy electrode at initial charge-discharge, and in relaxing the volume expansion during cycling, which improved the cycleability of Fe-P alloy electrode. They are also beneficial to diffusion of Li inset/out of materials, and improve coulombic efficiency in charge-discharge cycle. |
| Keywords: electrodeposition lithium ion battery amorphous Fe-P alloyelectrode |
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| 郑小美,黄 令,吴允狮,薛连杰,柯福生,孙世刚.非晶态Fe-P合金电极的电沉积制备及其储锂性能[J].无机化学学报,2009,25(2):317-320. |
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