Study on oxygen deficiency in spinel LiNi0.5Mn1.5O4 and its Fe and Cr-doped compounds

The oxygen deficiency is an important factor to affect the electrochemical properties of spinel LiNi 0.5 Mn 1.5 O 4 . In this study, we investigated how oxygen deficiency in spinel LiNi 0.5 Mn 1.5 O 4 was affected by calcination temperature and oxygen partial pressure. The oxygen deficiency as a function of calcination temperatures has been modeled. Doping elements have influence on oxygen deficiency. The oxygen dissipation of Cr-doped compounds LiNi 0.45 Cr 0.1 Mn 1.45 O 4 at high temperature is less than pristine LiNi 0.5 Mn 1.5 O 4 . Under the same calcination and cooling condition, there more oxygen deficiency remained in Fe and Cr-doped compounds than in pristine LiMn 1.5 Ni 0.5 O 4 . The coulomb efficiencies of LiNi 0.45 Cr 0.1 Mn 1.45 O 4 in the first charge and discharge cycle reached a high value of 89.1%.