The Li1.2Mn0.54-xNbxCo0.13Ni0.13O2-6xF6x (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 Li1.2Mn0.54Co0.13Ni0.13O2, 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 Li1.2Mn0.54-xNbxCo0.13Ni0.13O2-6xF6x shows suppressed voltage fade and higher capacity retention of 98.1% after 200 cycles at rate of 1 C. The replacement of O2- by the strongly electronegative F- is beneficial for suppressed the structure change of Li2MnO3 from the eliminating of oxygen in initial charge process. Therefore, the initial coulombic efficiency of doped Li1.2Mn0.54-xNbxCo0.13Ni0.13O2-6xF6x gets improved, which is higher than that of pure Li1.2Mn0.54Co0.13Ni0.13O2. In addition, the Nb and F co-doping can effectively enhance the transfer of lithium-ion and electrons, and thus improving rate performance.
CITATION STYLE
Ming, L., Zhang, B., Cao, Y., Zhang, J. F., Wang, C. H., Wang, X. W., & Li, H. (2018). Effect of Nb and F Co-doping on Li1.2Mn0.54Ni0.13Co0.13O2 cathode material for high-performance lithium-ion batteries. Frontiers in Chemistry, 6(APR). https://doi.org/10.3389/fchem.2018.00076
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