电沉积-烧结制备Co_3O_4锂离子电池负极及电性能

Co_3O_4 Negative Electrode for Lithium-Ion Batteries Prepared by Electrochemical Deposition-Sintering Processes and Its Capacitance Performance

采用电沉积 -烧结方法制备Co3O4 锂离子电池负极。X射线衍射XRD分析表明 ,电沉积的物质是Co(OH) 2 相 ,30 0℃烧结后均转变为Co3O4 相。扫描电镜SEM观察发现获得的Co3O4 具有花瓣形貌 ,其花瓣厚度约 2 0nm。在 30 0℃分别烧结 30、4 5、6 0min制备的Co3O4 组装的Co3O4 Li电池 ,在充放电循环中的首次嵌锂比容量分别为 136 1 7、14 5 7 6和 1345 0mAh g,首次脱锂比容量分别为 75 7 7、90 5 0和 794 8mAh g ,10次循环后 ,脱锂比容量分别上升到 815 5、96 9 0和 890 1mAh g。

The Co3O4 negative-electrode for lithium-ion batteries was prepared by electrochemical deposition and sintering processes. XRD analysis illustrates that the essential phase of the electrochemical deposited product is Co(OH)2, which transforms to Co3O4 after sintering at 300°C. From SEM observation, it is found that Co3O4 is the image of a leaves morphology with sizes of 20 - 30 nm in thickness. Co3O4/Li batteries were made by Co3O4, which was sintered at 300°C for 30, 45 and 60 min, respectively. During the first charge-discharge cycle, it is found that the specific capacities of Li ions insertion are 1361.7, 1457.6 and 1345.0 mAh/g and the specific capacities of Li ions extraction are 757.7 mAh/g, 905.0 mAh/g and 794.8 mAh/g, respectively. The specific capacities of discharge increase to 815.5 mAh/g, 969.0 mAh/g and 890.1 mAh/g after 10 cycles, respectively.