掺杂Pr^(3+)的尖晶石LiPr_xMn_(2-x)O_4的合成及电化学性能

Synthesis and Electrochemical Properties of Pr^(3+)-doped LiPr_xMn_(2-x)O_4 Spinel

采用溶胶凝胶法合成掺杂稀土镨离子的锂锰尖晶石LiPrxMn2-xO4,并对其结构和电化学性能进行初步研究。结果表明,当掺入的Pr3+含量较低(x≤0.02)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。Pr3+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Pr3+对尖晶石结构的稳定作用。电极材料LiPr0.02Mn1.98O4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118mAh·g-1,100次循环后仍能保持初始容量的98%。

Praseodymium doped spinel LiPrxMn2-xO4 with single phase was synthesized by Sol-gel route.Its structure and electrochemical properties were studied by XRD,XPS and electrochemical measurements.The results show that when the doped Pr content is low（x≤0.02）,the obtained product can maintain the whole spinel structure and exhibit excellent electrochemical properties.Pr3＋ doping increases the cycle stability of the material greatly,which results from its stabilization for the spinel structure.The electrode of LiPr0.02Mn1.98O4 shows optimal electrochemical properties with a first discharge capacity of 118 mAh·g-1 and 98% of the initial capacity after 100 cycles at the current rate of 0.2 C.As cathode material of lithium-ion battery,this praseodymium doped spinel material is one of the most promising substitutes for LiCoO2.