Journal
APPLIED SURFACE SCIENCE
Volume 290, Issue -, Pages 412-418Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2013.11.094
Keywords
LiNi0.5Mn1.5O4; Sm-doped; Electrode materials; Spinel; Cyclic voltammetry
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Funding
- Development and Reform Commission of Guangdong Province, China [301-5]
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Spinel powders of Sm-doped LiNi0.5SmxMn1.5-xO4 with different Sm contents (x = 0, 0.01, 0.03, and 0.05) have been synthesized by a gelatin-assisted solid-state method. The structural and electrochemical properties of the electrode materials are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), cyclic voltammetry (CV), charge/discharge testing and electrochemical impedance spectroscopy (EIS). The partial substitution of Sm3+ for Mn3+ in LiNi0.5Mn1.5O4 leads to a decrease in the lattice parameter and unit cell volumes, resulting in an improvement of structural stability, enhance the electronic conductivity and diminish the polarization and the charge transfer resistance. As a result, the cyclic ability at 25 degrees C performances and rate performances of LiNi0.5Mn1.5O4 electrode materials are significantly improved with the increasing Sm addition, compared to the pristine LiNi0.5Mn1.5O4, though high doping gives rise to a small reduction of the initial discharge capacity. (C) 2013 Elsevier B.V. All rights reserved.
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