Silver-coated silicon microchannel plates for three-dimensional lithium-ion batteries anodes
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摘要: 采用光辅助电化学刻蚀和无电镀银方法,制备出一种可用于三维锂离子电池的覆银硅微通道板(Ag/Si-MCP)负极结构. 利用XRD和扫描电镜(SEM)对材料特性进行表征;并在氩气氛保护下以锂片为对电极封装为CR2025半电池,采用恒流充放电测试、循环伏安法(CV)及交流阻抗法(EIS),对银覆盖层对电极性能的影响进行了细致的分析. 在0.02 V~1.5 V电位(vs. Li+/Li)范围内以10 mAg-1电流密度进行恒流充放电测试. 样品在首次充电(硅的锂合金化)过程中获得高达3 484.7 mAhg-1的比容量值,且在首次充放电循环中库仑效率达到95.97%. 并在随后的循环中,表现出优于未经覆银处理的硅微通道电极的性能.Abstract: In this work, a three-dimensional (3-D) anode using a silver-coated Si microchannel plate (Si-MCP) as the active materials was prepared by photo-assisted electrochemical etching followed by electroless deposition. Using lithium foils as the counter electrodes, representative half-cells are fabricated and tested. In galvanostatic charge-discharge (C-D) measurements at 10 mAg-1 between 0.02 and 1.5 V, our anode exhibits a charge capacity of 3484.7 mAhg-1 with a coulombic efficiency close to 95.97% in the initial cycle. Based on the cyclicvoltammetry (CV) and the electrochemical impedance spectroscopy (EIS) data, the mechanism about the lithiation of Ag-coated Si-MCP was also studied.
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