Abstract
Reliable, low-cost electrocatalysts of La and Ni co-doped LiMn2O4 for energy storage applications were successfully synthesized via the sol-gel method. Herein, the effect of La3+ and Ni2+ co-doping in Mn3+ of LiMn2−x(LaNi)xO4 (x = 0, 0.01, 0.02, 0.03, 0.04 and 0.05) samples were studied. X-ray diffraction (XRD) results for structural characterization established the cubic spinel structure of the materials. Microstructural studies of the synthesized materials via field emission scanning electron microscopy (FE-SEM) revealed that the particle size was reduced with La3+and Ni2+ doping. The electrochemical properties that were investigated in the voltage range of 0.2–1.2 V showed improved structural stability, and therefore Jahn–Teller distortion was effectively suppressed. Cyclic voltammetry (CV) revealed that a 4% substitution of (La and Ni) in Mn3+ exhibited improved lithium-ion reversibility. Electrochemical impedance spectroscopy (EIS) showed an improved charge transfer resistance of 41 Ω for (LaNi) 0.04 doping over other doping concentrations and pure LiMn2O4. Charge-discharge studies revealed that the initial discharge capacity of LiMn1.92(LaNi)0.04O4 is 132.1 mAh/g in aqueous Li2SO4 electrolyte is improved over other doping concentrations and pristine LiMn2O4.
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Acknowledgments
The authors gratefully acknowledge the management of the Koneru Lakshmaiah Education Foundation (KLEF) for their encouragement and support; Dr. A. Venkateswara Rao is thankful to DST for providing financial assistance DST-SERB, Young Scientist Project: File No. SB/FTP/ETA-0176/2014, and also the Department of Science and Technology (DST-SERB), Govt. of India, for the award of DST-FIST level-I (SR/FST/PS-I/2018/35) to the Department of Physics.
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Madhu, M., Venkateswara Rao, A. & Mutyala, S. La and Ni Co-doping Effect in LiMn2O4 on Structural and Electrochemical Properties for Lithium-Ion Batteries. J. Electron. Mater. 50, 5141–5149 (2021). https://doi.org/10.1007/s11664-021-09037-w
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DOI: https://doi.org/10.1007/s11664-021-09037-w