Abstract
AbstractThe Li−Ni−Co−Mn−O layered cathode materials are promising for the advanced lithium‐ion batteries due to their moderate cost and high specific capacity. However, the low electronic conductivity and poor stability at high currents need to be overcome to meet the ever‐growing demands. In this work, single crystal hexagonal nanosheets of LiNi0.6Co0.2Mn0.2O2 are synthesized by the hydrothermal process, which are further controllably doped with fluorine to improve the lithium storage performance. The fluorine doping can not only improve the layered structure, but also increase the lattice oxygen content, to promote the lithium‐ion migration and crystal structure stability of the layered LiNi0.6Co0.2Mn0.2O2. Optimized fluorine doping leads to excellent capacity and cyclic stability of the single crystal LiNi0.6Co0.2Mn0.2O2 nanosheets with an original capacity of 168.3 mAh g−1, and an excellent capacity retention rate of 94.5 % at 1.0 C over 100 cycles, which are superior to the control samples and hold potential for the lithium‐ion battery applications.
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