关键词: 锂离子电池, 富锂材料, Al掺杂, 循环性能

Abstract: The Al-doped 0.5Li₂MnO₃·0.5Li(Mn_0.4Co_0.2Ni_0.4)O₂ compounds were successfully synthesized as cathode materials for lithium-ion batteries. The pristine and Al-doped materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectrometry (ICP-AES) and laser Raman spectroscopy. The results indicated that all the prepared materials were indexed as a hexagonal structure with R-3m space group, and Al element had been introduced into lattice. When cycled at 180 mA·g^-1 (1 C-rate), the capacity retention of 4% (by mole) Al-doped 0.5Li₂MnO₃·0.5Li(Mn_0.4Co_0.2Ni_0.4)O₂ electrode was as high as 83.7% after 100 cycles. The Al-doped materials could enhance the structural stability of electrodes, which contributes to high stabilized performance of cathode material for lithium ion batteries.

Key words: lithium-ion battery, lithium enriched material, Al-doping, cycling performance