Heightening the long cycling stability and reducing oxygen loss of Li-rich cathode materials by Mo–F Co-doping for half/full lithium-ion batteries

In this work, a sequence of lithium (Li)-rich cathode materials modified by co-doping of anions and cations were synthesized by ball milling spray drying method. Analysis by XRD, SEM, TEM and XPS characterizations indicated that the Mo and F elements were successfully co-doped into the skeleton structure of material and their modification mechanism was explained in detail. The electrochemical performance evaluations showed that Mo and F doped remarkably heightened the electrochemical property of the Li-rich cathode material. The initial discharge capacity of Li[Li0.2Mn0.54Ni0.13Co0.13]0.995Mo0.005O1.99F0.01 (MF-LR) sample was 227.0 mAh g−1 at 0.5C, and the capacity retention could reach 93.08% after 100 cycles. Even at the high current density of 1 C, the initial capacity was 194.7 mAh g−1, which decreased by only 8.2% after 100 cycles. More importantly, the full battery performance of MF-LR samples assembled with cathodes and graphite as anode electrodes was prominent. At 1 C, the initial capacity was 190.7 mAh g−1, and it would remain 77.40% after 100 cycles.