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http://dx.doi.org/10.5229/JKES.2013.16.2.59

Effects of Calcinations Temperature on the Electrochemical Properties of Li[Ni0.6Co0.2Mn0.2]O2 Lithium-ion Cathode Materials  

Yoo, Gi-Won (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Jeon, Hyo-Jin (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Son, Jong-Tae (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korean Electrochemical Society / v.16, no.2, 2013 , pp. 59-64 More about this Journal
Abstract
Using $Na_2CO_3$ and $MeSO_4$ (Me = Ni, Co and Mn) as starting materials, the precursor of $[Ni_{0.6}Co_{0.2}Mn_{0.2}]CO_3$ has been synthesized by carbonate co-precipitation. The precursor was mixed with $Li_2CO_3$, and calcined at 750, 850, and$950^{\circ}C$ in air. Effect of calcinations temperature on characteristics of $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$ cathode materials was investigated. The structure and characteristics of $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$ were determined by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and electrochemical measurements. The X-ray diffraction (XRD) results show that the intensity ratio of $I_{(003)}/I_{(104)}$ increased and the R-factor ratio decreased with the increase of calcinations temperature. And Scanning electron microscopy (SEM) result show that the primary particle size increased. Especially, the $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$ calcined at $950^{\circ}C$ for 24 H shows excellent electrochemical performances with reversible specific capacity of $165.3mAhg^{-1}$ [cut-off voltage 2.5~4.3 V, 0.1 C($17mAhg^{-1}$)] and good capacity retention of 95.4% after 50th charge/discharge cycles[cut-off voltage 2.5~4.3 V, 1 C($170mAhg^{-1}$)].
Keywords
Carbonate co-precipitation; Cathode material; Lithium ion battery;
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