钕,铈掺杂的正极材料尖晶石型LiMn_2O_4的制备及性能

Preparation and Properties of LiRE_xMn_(2-x)O_4(RE=Nd, Ce) as a Cathode

通过掺杂不同含量的Nd,Ce制备LiMn2 -xRExO4 (RE =Ce ,Nd ;x=0 ,0 0 5,0 1 ,0 1 5,0 2 )锂离子电池正极材料 ,研究稀土元素掺杂对尖晶石LiMn2 O4 正极材料电化学性质的影响。掺杂Nd ,Ce后LiMn2 O4 正极材料更适合于锂离子的嵌入和脱出 ,电池的循环性能提高 ,但充放电容量随掺杂量的增加而下降。X射线光电子能谱分析表明掺杂Nd ,Ce的LiMn2 O4 正极材料 ,其Mn4 + 含量增加 ,且Mn4 + 含量对LiMn2 O4 锂离子电池正极材料的容量和循环特性起主要作用。

LiRE x Mn 2-x O 4(RE=Ce, Nd) was studied in order to further understand the dependence of the electrochemical performance on the doped rare earth metals. These cathodes are more tolerant to repeated lithium extraction and insertion than a standard LiMn 2O 4 spinel electrode in spite of a small reduction in the initial capacity. X ray photoelectron spectroscopy results show that the Mn 4+ contents of spinel LiMn 2O 4 samples directly affect the initial capacity and cyclability of LiMn 2O 4 cathode materials.