Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 23, Pages 13014-13021Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03125
Keywords
magnesium doping; lithium-rich manganese-based oxides; cycling stability; rate capability; cathode; lithium-ion battery
Funding
- National Key Basic Research Program of China [2015CB251100]
- National Science Foundation of China [21173160, 21333007]
- Program for New Century Excellent Talents in University [NCET-12-0419]
- Hubei National Funds for Distinguished Young Scientists [2014CFA038]
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Mg-doped Li[Li0.2-2xMgxCo0.13Ni0.13Mn0.54]O-2 is synesized by introducing Mg ions into the transition-metal (TM) layer of this layered compound for substituting Li ions through a simple polymer-pyrolysis method. The :structural and morphological characterization reveals that the doped Mg ions are uniformly distributed in the bulk lattice, showing an insignificant impact on the layered structure. Electrochemical experiments reveal that, at a Mg doping of 4%, the Li[Li0.16Mg0.04Co0.13Ni0.13Mn0.54]O-2 electrode can deliver a larger initial reversible capacity of 272 mAh g(-1), an improved rate capability with 114 mAh g(-1) at 8 C, and an excellent cycling stability with 93.3% capacity retention after 300 cycles. the superior electrochemical performances Of the Mg-doped material are possibly due to the enhancement of the structural stability by substitution of Li by Mg in the TM layer, which effectively suppresses the cation mixing arrangement, leading to the alleviation of the phase change during lithium-ion insertion and extraction.
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