掺杂Y^(3+)的锂锰尖晶石的合成及其电化学性能研究  

Synthesis and Electrochemical Properties of Yttrium-doped Lithium Manganese Spinel

作　　者：汤昊[1] 冯传启[1] 刘浩文[1] 雷太鸣[1] 张克立[1] 孙聚堂[1] 

机构地区：[1]武汉大学化学与分子科学学院,武汉430072

出　　处：《化学学报》2003年第1期47-50,共4页Acta Chimica Sinica

基　　金：国家自然科学基金(No.2 0 0 71 0 2 6)资助项目

摘　　要：采用流变相反应法合成了掺杂稀土钇离子的锂锰尖晶石LiYxMn2 -xO4 ,并对其结构和电化学性能进行了初步研究.结果表明,当掺入的Y3+的含量较低(x≤ 0 0 2 )时,得到的产物能保持完整的尖晶石结构,并表现出极佳的电化学性能.Y3+的掺入使材料的循环稳定性能大幅度提高,而这种提高是源于Y3+对尖晶石结构的稳定作用.电极材料LiY0.0 2 Mn1.98O4 显示了最优的电化学性能,在 0 2C放电速率下,其初始放电容量为 118mA·h·g-1,10 0次循环后仍能保持初始容量的 98%Yttrium-doped spinel LiYxMn2-x O-4 with single phase were synthesized by rheological phase reaction method. The structural and electrochemical properties of the material were studied by XRD and electrochemical measurements. The data of XRD show that the limit of Y solubility is x less than or equal to 0.02. The beneficial effect of Y is evident by way of improved cyclability, which is due to the structure stability of the yttrium-doped spinel. The electrode of LiY0.02 Mn-1.98 O-4 shows excellent electrochemical properties with a first discharge capacity of 118 mA (.) h (.) g(-1) and retaining 98% of the initial capacity after 100 cycles at the current rate 0.2 C.

关 键 词：掺杂 锂锰尖晶石 合成 电化学性能 锂离子电池 正极材料 流变相反应 钇(Ⅲ) 

分 类 号：TM911[电气工程—电力电子与电力传动]