The Effects of Li-Site Substitution with Co on the Electrochemical Performance of LiMnPO₄/C

Abstract:

Li_(1-2x)Co_xMnPO₄/C composite cathode materials for lithium ion battery are synthesized by sol-gel method with following heat-treatment in the air. Environment scanning electron microscopy measurements show that the particles are irregular and inhomogeneous, and that particle sizes slightly enlarge with the elevation of sintering temperatures. Powder X-ray diffraction analysis indicates that the samples are olivine-structured. Electrochemical tests indicate that the optimal sintering temperature registers 400 °C, and that the cyclic ability of LiMnPO₄ is greatly improved by doping Co²⁺. When tested at 0.02 C rate between 2.8 and 4.4 V, the initial discharge capacity of the sample with initial composition of x=0.07 sintered at 400 °C reaches 112.2 mAh/g , after 70 cycles, the capacities remain 58.8mAh/g.

• Periodical: Advanced Materials Research (Volumes 512-515)
• Pages: 1009-1013
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.512-515.1009
• Online since: May 2012
• Authors: Li Juan Deng, Yu Rong Zhang, Wei Li Liu
• Keywords: Cathode Material, Doping, Electrochemical Performance, LiMnPO₄, Lithium-Ion Battery

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