Ni and Fe Dual-Doped Li4Mn5O12 Spinels as Cathode Materials for High-Voltage Li-Ion Batteries

摘要: The spinel Li4Mn5O12 has been considered as a prospective 3 V cathode material for the next generation of lithium-ion batteries (LIBs) due to its high energy density and excellent cycling stability. However, low operating voltage (∼3 V) makes impractical high-energy high-power LIBs. To address this issue, Ni Fe dual doped Li4Mn5-x-yNixFeyO12 prepared via facile sol-gel method combined with post-heat-treatment. effects dual-cations doping on crystal structure, morphology electrochemical properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) galvanostatic charge/discharge analysis. As result, Li4Mn4Ni0.5Fe0.5O12 exhibits highest reversible specific capacity 133 mAh/g at current 25 mA/g after 100 cycles significantly improved performance corresponding ∼80 an average 4.7 vs. Li/Li+ ∼122 above 4.0 V. These results indicate can effectively improve both stability, demonstrating promising high-voltage © 2015 Electrochemical Society. [DOI: 10.1149/2.0601508jes] All rights reserved.