Low Temperature Synthesis and Characterization of Carbon-Coated LiMnPO4 for Lithium-Ion Batteries

Wednesday, 31 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
R. V. Penumaka, M. P. Lastres, and I. Bhattacharya (Tennessee technological university)
LiMnPO4 based phospho olivines are considered to be environmentally friendly, and low cost potential cathode material for the next generation of Li-ion secondary batteries to meet the huge market of electric and hybrid vehicles [1, 2]. The relatively higher operation voltage at around 4 V makes the theoretical specific energy of LiMnPO4 (684 Wh/kg) 20% greater than that of LiFePO4 (578 Wh/kg) while still compatible with most conventional electrolytes [3]. However, due to the low electrical conductivity and poor Li ion diffusion kinetics these materials are unsuitable for practical applications [4]. In here, carbon coated LiMnPOwas synthesized by both solid state and modified sol-gel technique using a low temperature synthesis techniques. The cathode materials obtained were characterized and performance was compared and evaluated. Results of the electrochemical tests show that the prepared LiMnPO4/C (around 10 wt. % carbon) composites by both the routes exhibits not only a high initial discharge capacity but also good cycling stability. Although highly crystalline phase pure cathode materials could be obtained by both the processes, the materials prepared by sol-gel process delivered slightly better electrochemical performance when compared to solid state process.


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