尖晶石LiMn_2O_4纳米粉的合成及其交流阻抗性能研究  

Study on synthesization of spinel-LiMn_2O_4 nanoparticles and its electrochemical impedance spectroscopies

作　　者：林永[1] 赵锟[1] 王曼丽[1] 

机构地区：[1]遵义师范学院,贵州遵义563002

出　　处：《化学研究与应用》2011年第8期975-979,共5页Chemical Research and Application

基　　金：贵州省教育厅自然科学研究项目(教黔科2007071)资助;遵义市科技局基金项目(遵市科合社字[2008]27号)资助

摘　　要：以LiOH和电解二氧化锰(EMD)为原料,葡萄糖为还原剂,制备了粒径为200 nm左右的球状尖晶石LiMn2O4纳米粒子,并用X射线衍射(XRD)和扫描电镜(SEM)对样品进行了结构和形貌的表征。在循环伏安测试(CV)峰电位下研究了该材料嵌脱锂相变过程中的交流阻抗(EIS)图谱,并提出一种新的等效电路对EIS图谱进行拟合。结果表明,尖晶石LiMn2O4纳米粒子具有较好的嵌脱锂可逆性,各CV峰电位下EIS图谱的拟合值与实验值相当吻合。LiMn2O4 spinel nanoparticles was prepared using LiOH,electrolytic manganese dioxide（EMD）,and glucose.These nanoparticles were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）.Electrochemical impedance spectroscopies of Li ion in spinel lithium manganese oxide were studied at the peak potential of cyclic voltammetry（CV）.New equivalent circuits modeling were proposed to fit the experimental electrochemical impedance spectroscopies.The results indicated the reversibility of lithium ion intercalation and deinterlecalation was good,the fitting results were in agreement with the experimental results.

关 键 词：纳米粒子 尖晶石锰酸锂 水相还原法 交流阻抗性能 等效电路 

分 类 号：O646[理学—物理化学]