posted on 2024-01-31, 16:45authored bySoo-Been Lee, Nam-Yung Park, Geon-Tae Park, Un-Hyuck Kim, Sung-June Sohn, Min-Seok Kang, Rogério
M. Ribas, Robson S. Monteiro, Yang-Kook Sun
Doping is indispensable for ensuring
the long-term cycling stability
of the Ni-rich layered cathodes. However, using a single type of dopant
limits the development of a stable, high-energy cathode material in
a single shot. In this study, a dual doping strategy using Al3+ and Nb5+ ions was adopted to improve the cycling
stability of Li[Ni0.92Co0.04Mn0.04]O2 (NCM92) cathode; Al3+ doping fortifies
the crystal structure, while Nb5+ doping optimized the
morphology of the primary particles. The dual doping strategy not
only combines the benefits of both dopants simultaneously but also
demonstrates excellent performance enhancement through synergistic
effects. The Li[Ni0.905Co0.04Mn0.04Al0.005Nb0.01]O2 (AlNb-NCM92) cathode,
which was developed through the dual doping of Al and Nb, exhibited
remarkable stability, retaining 88.3% of its initial capacity even
after 1000 cycles. This result suggests that the doping strategy needs
to comprehensively consider both the crystal structure and the microstructure
to maximize the long-term cycling stability of high-energy Ni-rich
cathode materials.