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The Li 1.2 Mn 0.54−x Nb x Co 0.13 Ni 0.13 O 2−6x F 6x  ( x  = 0, 0.01, 0.03, 0.05) is prepared by traditional solid-phase method, and the Nb and F ions are successfully doped into Mn and O sites of layered materials Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 , respectively. The incorporating Nb ion in Mn site can effectively restrain the migration of transition metal ions during long-term cycling, and keep the stability of the crystal structure. The Li 1.2 Mn 0.54−x Nb x Co 0.13 Ni 0.13 O 2−6x F 6x  shows suppressed voltage fade and higher capacity retention of 98.1% after 200 cycles at rate of 1 C. The replacement of O 2−  by the strongly electronegative F −  is beneficial for suppressed the structure change of Li 2 MnO 3  from the eliminating of oxygen in initial charge process. Therefore, the initial coulombic efficiency of doped Li 1.2 Mn 0.54−x Nb x Co 0.13 Ni 0.13 O 2−6x F 6x  gets improved, which is higher than that of pure Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 . In addition, the Nb and F co-doping can effectively enhance the transfer of lithium-ion and electrons, and thus improving rate performance.

Effect of Nb and F Co-doping on Li1.2Mn0.54Ni0.13Co0.13O2 Cathode Material for High-Performance Lithium-Ion Batteries