Electrochemical Studies on Novel LiMnPO₄ Coated with Magnesium Oxide-Gold Composite Thin Film in Aqueous Electrolytes

Abstract:

Abstract. Pristine LiMnPO₄ and LiMnPO₄/Mg-Au composite cathode materials were synthesized and their electrochemical properties interrogated using voltammetric, spectroscopic and microscopic techniques. The composite cathode exhibited better reversibility and kinetics than the pristine LiMnPO₄. This was demonstrated in the values of the diffusion coefficient (D) and the charge and discharge capacities determined through cyclic voltammetry. For the composite cathode, D = 2.0 x 10^-9 cm²/s while the pristine has a D value of 4.81 x 10^-10 cm²/s. The charge and discharge capacities of LiMnPO₄/Mg-Au at 10 mV/s were 259.9 mAh/g and 157.6 mAh/g, respectively. The corresponding values for pristine LiMnPO₄ were 115 mAh/g and 44.75 mAh/g, respectively.. A similar trend was observed in the results obtained from electrochemical impedance spectroscopy measurements. These results indicate that LiMnPO₄/Mg-Au composite has better conductivity and will facilitate faster electron transfer and better electrochemical performance than pristine LiMnPO₄.

• Periodical: Journal of Nano Research (Volume 44)
• Pages: 90-99
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.44.90
• Online since: November 2016
• Authors: Ntuthuko Wonderboy Hlongwa, Chinwe O. Ikpo*, Natasha Ross, Myra Nzaba, Miranda M. Ndipingwi, Priscilla Gloria Lorraine Baker, Emmanuel Iheanyichukwu Iwuoha
• Keywords: Coating, Composite Material, Diffusion Coefficient, Lithium-Ion Batteries, Olivine Cathode

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