Synthesis of LiMn_0.7Fe_0.3PO₄/C Composite Cathode Materials for Lithium-Ion Batteries

Abstract:

LiMn0.7Fe0.3PO4/C composite cathode material was prepared by using a solid state reaction method. The effects of annealing temperatures on the structural and electrochemical performance of LiMn0.7Fe0.3PO4/C were investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), charge–discharge tests and electrochemical impedance spectra (EIS). The results showed that all of samples have pure ordered olivine phase with orthorhombic Pnma structure. The electrochemical performance of LiMn0.7Fe0.3PO4/C can be improved remarkably with increasing temperature from 550oC to 650 oC due to increased crystallization, cation-order and decreased charge transfer resistance. However, increase temperature to 700 oC leads to bigger crystal particle size and decreased cation-order, thus higher resistance and deteriorated electrochemical properties. The sample prepared at optimized temperature of 650 oC presents a remarkable improved electrochemical performance. It delivers an initial capacity of 125.1 mAhg-1 at 0.2C, 95 mAhg-1 at 5C, and a capacity retention of 98.0% after 30 cycles.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 2617-2620
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.2617
• Online since: January 2013
• Authors: Na Chi, Jian Gang Li, Lei Wang, Jie Si Fu
• Keywords: Carbon, Cathode, Composite, Li-Ion Battery, LiMn_0.7Fe_0.3PO₄

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