The cathode-active materials, Li1＋yMxMn2-xO4 （M = Al, Co, Ni, Zn, y = 0.02, x = 0.02） powder, were synthesized by sol-gel method using LiOH, Mn（NO3）2 as the starting materials, citric acid as a carrier and Al（NO...The cathode-active materials, Li1＋yMxMn2-xO4 （M = Al, Co, Ni, Zn, y = 0.02, x = 0.02） powder, were synthesized by sol-gel method using LiOH, Mn（NO3）2 as the starting materials, citric acid as a carrier and Al（NO3）3·9H2O or Co（NO3）2·6H2O or Ni（NO3）2·6H2O or Zn（NO3）2·6H2O as dopants. The influence of different doping elements on the structural properties of the as-prepared samples was investigated by X-ray diffraction （XRD）, infrared （IR） spectroscopy and scanning electron microscopy （SEM）. X-ray diffraction patterns of the prepared samples were identified as the spinel structure with space group Fd3m. The grain size increases gradually as the sintering temperature rises and corresponding activation energies for the grain growth have been estimated using Arrhenius’ empirical relation.展开更多
基金This work was supported by the National Natural Science Foundation of China (60671010)Natural Science Foundation of Shandong Province (Y2006B29)
文摘The cathode-active materials, Li1＋yMxMn2-xO4 （M = Al, Co, Ni, Zn, y = 0.02, x = 0.02） powder, were synthesized by sol-gel method using LiOH, Mn（NO3）2 as the starting materials, citric acid as a carrier and Al（NO3）3·9H2O or Co（NO3）2·6H2O or Ni（NO3）2·6H2O or Zn（NO3）2·6H2O as dopants. The influence of different doping elements on the structural properties of the as-prepared samples was investigated by X-ray diffraction （XRD）, infrared （IR） spectroscopy and scanning electron microscopy （SEM）. X-ray diffraction patterns of the prepared samples were identified as the spinel structure with space group Fd3m. The grain size increases gradually as the sintering temperature rises and corresponding activation energies for the grain growth have been estimated using Arrhenius’ empirical relation.
