Zn-Y Co-Doping Lini0.5mn1.5o4 Cathode Materials with High Electrochemical Performance

LiNi 0.5-x Zn x Mn 1.48 Y 0.02 O 4 (x=0.01, 0.03, 0.05) were prepared via sol-gel method. The action of mechanism that the Zn 2+ and Y 3+ co-doping on morpho-structural and Mn 3+ ion dissolution behaviors to improve the electrochemical performance of LiNi 0.5 Mn 1.5 O 4 sample is revealed. Compared with pristine LNMO, the increased lattice parameters, morphological evolution and decreased Mn 3+ contents of Zn-Y co-doped LNMO samples have better electrochemical properties. Among all samples, LiNi 0.47 Zn 0.03 Mn 1.48 Y 0.02 O 4 (0.03Zn-Y) sample displays optimal electrochemical property at room temperature and elevated temperature. After 200 cycles, the 0.03Zn-Y sample still has excellent cycling performance of 134.529 mAh g -1 at 1C (capacityretention is 94.7%), higher than that of pristine sample (104.913 mAh g -1 , capacity retention is 92.7%). Besides, when tested at 1C at high temperature (55°C)and after 120 cycles, the 0.03Zn-Y sample reached a discharge capacity of 94.004 mAh g -1 and maintained 79.6% capacity retention, higher than pristine sample(52.430 mAh g -1 , 43.6% capacity retention).