Abstract
Spinel powders of Sm-doped LiNi0.5SmxMn 1.5-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 LiNi0.5Mn1.5O 4 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 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.
Original language | English |
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Pages (from-to) | 412-418 |
Number of pages | 7 |
Journal | Applied Surface Science |
Volume | 290 |
Early online date | 25 Nov 2013 |
DOIs | |
Publication status | Published - 30 Jan 2014 |
Keywords
- LiNi0.5Mn1.5O4
- Sm-doped
- Electrode materials
- Spinel
- Cyclic voltammetry
Profiles
-
Oscar Hui
- School of Engineering - Reader in Energy Storage & Conversion
- Emerging Technologies for Electric Vehicles (EV) - Member
- Energy Materials Laboratory - Member
Person: Research Group Member, Academic, Teaching & Research