化学镀铜法制备硅铜复合材料及其在锂离子电池中的应用

采用胶体钯溶液为活化液、次磷酸钠为还原剂的镀液体系，对硅粉表面进行化学镀铜，通过正交实验确定了较佳施镀工艺，对Si-Cu复合粉体进行物相和形貌分析，并将其作为锂离子电池负极进行充放电测试. 结果表明，复合粉体出现了铜的晶面衍射峰，硅颗粒表面镀覆了一层致密均匀的铜颗粒；Si-Cu复合材料作为负极的锂离子电池首次放电比容量达1185 mA×h/g, 30次循环后逐渐降至457 mA×h/g, 60次循环后仍保持在350 mA×h/g，一定程度上缓冲了硅在脱/嵌锂时的体积效应，改善了电极循环性能.

Preparation of Si-Cu Composite with Electroless Copper Plating and Its Application in Lithium-ion Battery

Electroless copper plating on silicon particles was carried out with colloid palladium solution as activation liquid and NaH2PO2×H2O as reducing agent. The optimal coating conditions were obtained through orthogonal experiments. Phase analysis was run by XRD, SEM and TEM, and performance of electrochemistry examined by charging and discharging test. The results show that silicon surface is coated with a layer of dense copper particles. The Si-Cu composite anode of lithium-ion batteries shows good electrochemical performance, the initial discharge specific capacity reaches 1185 mA×h/g, after 30 cycles, the capacity gradually is reduced to 457 mA×h/g and can maintain 350 mA×h/g in the next 30 cycles. Therefore, Si-Cu composite can inhibit the volume effect of Si and improve the cycle performance of the electrode.