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

ABSTRACT: 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.

SUBMITTER: Ming L 

PROVIDER: S-EPMC5896303 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Effect of Nb and F Co-doping on Li<sub>1.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> Cathode Material for High-Performance Lithium-Ion Batteries.

Ming Lei L   Zhang Bao B   Cao Yang Y   Zhang Jia-Feng JF   Wang Chun-Hui CH   Wang Xiao-Wei XW   Li Hui H  

Frontiers in chemistry 20180405

The Li<sub>1.2</sub>Mn<sub>0.54-x</sub>Nb<sub>x</sub>Co<sub>0.13</sub>Ni<sub>0.13</sub>O<sub>2-6x</sub>F<sub>6x</sub> (<i>x</i> = 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<sub>1.2</sub>Mn<sub>0.54</sub>Co<sub>0.13</sub>Ni<sub>0.13</sub>O<sub>2</sub>, respectively. The incorporating Nb ion in Mn site can effectively restrain the migration of transition metal ions during long-term cyc  ...[more]

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