Li-Mn-○化合物的电性能与锂离子迁移性研究

Study on electrochemical performance and Li-ion transfer of Li-Mn-○ compound

采用天冬氨酸法合成Li-Mn-O化合物,对前驱体在400℃和750℃煅烧得到的样品进行X射线衍射分析(XRD),并对750℃煅烧样品进行电化学性能检测。结果表明:400℃制得的样品以纯尖晶石LiMn2O4存在,750℃下制得样品的首次充放电比容量分别为123.8mAh/g和122.5mAh/g,循环20次后放电比容量仍能达到121.0mAh/g,为初始放电比容量的98.77%。

Lithium manganese oxide, Li-Mn-O, was synthesized by the aspartic acid method. The samples calcined at 400 ℃ and 750 ℃ were investigated by XRD, and the sample synthesized at 750 ℃ was investigated by electrochemical performance. The results show that the phase-pure spinel LiMn2O4exists at 400℃. The initial charge and discharge capacity are 123.8 mAh/g and 122.5 mAh/g, respectively. After 20 cycles, the discharge capacity is also 121.0 mAh/g and 98.77% of the initial capacity.