【摘要】 实验对比了分别以化学还原法、球磨法和机械合金法所制备的Sn-Sb、Cu-Sn及Cu-Sn-Sb三种材料的电化学性能,相比之下,Cu-Sn-Sb三元复合材料具有较优越的综合电化学性能。未经热处理电极的电化学性能较差,而电极经热处理改性后具有良好的循环性能,首次锂脱出容量为534mAh·g-1,电极循环80次后容量还能维持在207mAh·g-1。材料的嵌锂态阻抗谱研究表明,随着嵌锂电位的降低,活性物质颗粒表面的SEI膜呈增厚趋势,并且电极内电荷的转移也经历从容易到困难再变得容易的过程。更多还原

【Abstract】 Three kinds of negative electrode materials for lithium ion batteries: Cu-Sn-Sb ternary composite material prepared by mechanical alloying for 60 h, Cu-Sn alloy prepared by ball milling for 50 h and Sn-Sb alloy synthesized by chemical reduction were examined. Cu-Sn-Sb ternary composite material showed the best electrochemical performance. Electrodes which were annealed exhibited better performance than electrode not annealed. Electrode annealed at 300 ℃ for 8 h delivered a capacity of 534 mAh·g-1 in preliminary test. After 80 cycles, a reversible capacity of 207 mAh·g-1 was kept. EIS for lithiation material shows that thickness of SEI film increased with the decrease of potential and charge transfer went through a process of easiness at the beginning, then difficulty, finally easiness.更多还原