Abstract
Powders of spinel LiLa x Mn 2— x O 4 were successfully synthesized by the ultrasonic-assisted sol-gel (UASG) method. The structure and properties of LiLa x Mn 2— x O 4 were examined by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electronic microscopy (SEM), galvanostatic charge-discharge test, and cyclic voltammetry (CV). XRD results show that the La 3+ can partially replace Mn 3+ in the spinel and the doped materials with La 3+ have a larger lattice constant compared with pristine LiMn 2O 4. FT-IR indicates that the absorption peak of Mn 3+−O and Mn 4+− O bonds has a red and blue shift with the increase of doping lanthanum in LiLa x Mn 2— x O 4, respectively. The charge-discharge test exhibits that the initial discharge capacity of LiLa x Mn 2— x O 4 drops off, and the capacity retention increases gradually at C/5 discharge rate with the increase of doping lanthanum, and LiLa 0.01Mn 1.99O 4 has a higher discharge capacity and a better cycling performance at 1C discharge rate. CV reveals that the doping La 3+ is beneficial to the reversible extraction and intercalation of Li + ions.
Published Version
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