【摘要】 采用在加温的水溶液中电沉积然后烧结方法制备锂离子电池的纳米Co3O4PTFE复合负极材料。XRD分析表明,电沉积的物质在245℃真空热处理后转变为Co3O4PTFE。SEM观察可以发现,Co3O4PTFE中的Co3O4呈现蜂窝结构,其厚度为30～50nm;PTFE则形成交联的柱状体吸附在片状Co3O4两侧,其直径为50～100nm。这种纳米Co3O4PTFE复合沉积层具有结构稳定、抗粉化的特点。充放电实验结果表明,Co3O4掺杂PTFE可明显提高负极材料的可逆比容量和循环性能,其首次放锂比容量为920.1mAh·g-1,20次循环后放锂比容量为685.6mAh·g-1;而没有掺杂PTFE的试样对应的数据分别为865.1mAh·g-1和180.4mAh·g-1。更多还原

【Abstract】 A Co₃O₄-PTFE composite negative electrode used for lithium-ion batteries was prepared by electrochemical-deposition in heated aqueous solution and then sintered at elevated temperature in vacaum. XRD analysis illustrates that the deposited layer Co（OH）\-2 transforms to Co₃O₄-PTFE after sintering in vacuum at 245℃. The SEM images show that the Co₃O₄ phase appears a morphology of honeycomb with thickness of 30～50nm and the PTEF,which adsorbs on the surfaces of Co₃O₄, forms a cross-linked columnar structure with a diameter about 50～100nm in Co₃O₄-PTFE electrode material.Such nano Co₃O₄-PTFE composite layer is stable and resistant to be powdered. The results of charge-discharge tests show that the cycle life and reversible specific capacity of the Co₃O₄ electrode doped with PTFE are improved obviously. The first discharging specific capacity of the Co₃O₄-PTFE electrode is 920.1 mAh·g^-1, and its discharging specific capacity is 685.6 mAh·g^-1 after 20 cycles. However, the first discharging specific capacity of the Co₃O₄ electrode is 865.1 mAh·g^-1, and its charging specific capacity is 180.4 mAh·g^-1 after 20 cycles without doped with PTFE.更多还原