High-efficiency Mo doping stabilized LiNi0.9Co0.1O2 cathode materials for rapid charging and long-life Li-ion batteries

Exploring the high-efficiency doping technique is the pivotal to strengthening the lattice of the Ni-rich cathode materials with rapid ions transfer for Li-ion batteries (LIBs). Herein, we have proposed a precursor doping insight with subsequent annealing to synthesize the LiNi0.9-xCo0.1MoxO2 cathode materials without the enrichment of extra components on the surface. The high MoO bond energy (560.2 KJ/mol) greatly ehnaces the reversibility of H2-H3 phase transformation. Meantime, the Li/Ni disorder and lattice oxygen loss are also impeded due to the Ni substitution by Mo with an accelerated Li+ diffusion kinetic. The optimized LiNi0.89Co0.1Mo0.01O2 gives a quite high reversible capacity of 202.4 mAh g−1 at 0.2 C and 139.5 mAh g−1 at 5 C. About 94.4% capacity can still be achieved after 200 cycles, much higher than the corresponding LiNi0.9Co0.1O2 (only 68.3%). This work gives an efficient doping method of the Ni-rich cathode materials for long driving range LIBs.