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Structure and electrochemical properties of LiLaxMn2-xO4 cathode material by the ultrasonic-assisted sol-gel method
Authors:Ting-feng Yi  Yan-rong Zhu
Institution:a School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China
b Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China
Abstract:Powders of spinel LiLaxMn2—xO4 were successfully synthesized by the ultrasonic-assisted sol-gel (UASG) method. The structure and properties of LiLaxMn2—xO4 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 La3+ can partially replace Mn3+ in the spinel and the doped materials with La3+ have a larger lattice constant compared with pristine LiMn2O4. FT-IR indicates that the absorption peak of Mn3+−O and Mn4+− O bonds has a red and blue shift with the increase of doping lanthanum in LiLaxMn2—xO4, respectively. The charge-discharge test exhibits that the initial discharge capacity of LiLaxMn2—xO4 drops off, and the capacity retention increases gradually at C/5 discharge rate with the increase of doping lanthanum, and LiLa0.01Mn1.99O4 has a higher discharge capacity and a better cycling performance at 1C discharge rate. CV reveals that the doping La3+ is beneficial to the reversible extraction and intercalation of Li+ ions.
Keywords:lithium ion battery  cathode material  lanthanum doping  structure  electrochemical performance
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