Synthesis and Electrochemical Characteristics of LiMnPO4/C Composite Materials for Lithium Ion Batteries

Monday, 27 July 2015
Hall 2 (Scottish Exhibition and Conference Centre)
B. S. Kang, K. J. Kim, S. W. Choi, M. Y. Kim, S. H. Yang, J. Lim (Korea Institute of Industrial Technology (KITECH)), M. S. Lee (Chonnam National University), and H. S. Kim (Korea Institute of Industrial Technology (KITECH))
Olivine-structured LiMnPO4 has attracted broad attention as a potential cathode material of Li-ion battery for EV application [1-2], which has some advantage with a higher energy density, higher redox potential and lower cost, etc. However, this material showed a poor electrochemical performance due to the low electronic conductivity [3-4]. Therefore, many researches have been performed to improve the electrochemical properties of LiMnPO4 material by the particle size reduction, cation doping and carbon coating, etc. [5-6]. In here, we studied nano-sized LiMnPO4/C composite materials with a high crystallization prepared using a modified co-precipitation method including a grinding mill and heat treatment process. As a result, the cell showed a good discharge capacity of 145mAh/g and a discharge potential of 3.8V. Furthermore, as the LiMnPO4/C material was combined with Li2MnO3-based material, the LiMnPO4/C composite materials showed a better electrochemical characteristic of above 200mAh/g at 0.05C. In summary, the nano-sized LiMnO4 material with a high crystallization shows good electrochemical properties at room temperature.


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