Mg-Ti共掺杂对高镍三元正极材料性能的影响OA

To enhance the cycling performance of Ni-rich cathode materials,a series of Ni-rich cath-ode materials co-doped with Mg and Ti in different proportions were synthesized via a co-precipitation combined method with high-temperature solid-phase method.The results show that Mg-Ti co-doping can inhibit the volume shrinkage caused by lattice deformation,enhance the struc-tural stability of Ni-rich cathode materials,thereby suppressing the occurrence of irreversible phase transitions during cycling and reducing the formation of microcracks.The Ni-rich cathode material modified by Mg-Ti co-doping has excellent cycle life and rate capability.When the doping ratio of Mg-Ti is 0.3％,the capacity retention rate of the Ni-rich material after 100 cycles at 1 C between 2.75～4.3 V is 89.14％.The discharge specific capacities at 3 C and 5 C rates are 178.73 and 174.35 mAh/g,respectively.