Synthesis and structural characterization of carbon coated LiMnPO4 cathode materials for lithium-ion batteries

Rajasegaran, Janagan (2024) Synthesis and structural characterization of carbon coated LiMnPO4 cathode materials for lithium-ion batteries. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Lithium-ion batteries (LIBs) have transformed the energy storage industry, with widespread use in portable electronics, electric vehicles, and renewable energy systems. Extensive research efforts have been directed towards developing high-performance LIBs with increased energy density, enhanced safety, and longer cycle life. Lithium manganese phosphate (LiMnPO4) has emerged as a promising cathode material among the various electrode materials. It possesses high theoretical capacity (170mAh g-1), excellent thermal stability, and operates at a high voltage (4.1 vs. Li+ /Li). However, its capability is capped by low intrinsic electronic conductivity and surface degradation. This study uses the carbon coating method to analyze its structural properties as the carbon content varies. The sol-gel method was employed for the carbon coating process with organically derived glucose as the cost-effective carbon source. The carbon-coated samples were characterized using X-ray diffraction (XRD), Raman spectroscopy and field emission scanning electron microscope (FESEM) with energy dispersive X-ray (EDX). The results of the qualitative and quantitative analyses indicate that 15wt% C-LiMnPO4 exhibits the best structural properties that may contribute to the best electrochemical properties based on a comparison of previous studies. An optimized carbon coat may provide improved electronic conductivity and structural stability while maintaining its desired crystal structure. Overall, this study utilized an eco-friendly and cost-effective improvement technique that enhances the structural characteristics and may improve the cathode material's electrochemical properties.

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