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http://dx.doi.org/10.5229/JKES.2013.16.4.191

Influence of Precursor on the Electrochemical Properties of Li(Ni0.5Co0.2Mn0.3)O2 Cathode for the Lithium Secondary Battery  

Kang, Donghyun (Graduate School of Green Energy Technology, Chungnam National University)
Arailym, Nurpeissova (Graduate School of Green Energy Technology, Chungnam National University)
Chae, Jeong Eun (Graduate School of Green Energy Technology, Chungnam National University)
Kim, Sung-Soo (Graduate School of Green Energy Technology, Chungnam National University)
Publication Information
Journal of the Korean Electrochemical Society / v.16, no.4, 2013 , pp. 191-197 More about this Journal
Abstract
The one of the cathode material, $Li(Ni_{0.5}Co_{0.2}Mn_{0.3})O_2$, was synthesized by the precursor, $Ni_{0.5}Co_{0.2}Mn_{0.3}(OH)_2$, from the co-precipitation method and the morphologies of the primary particle of precursors were flake and needle-shape by controlling the precipitation parameters. Identical powder properties, such as particle size, tap density, chemical composition, were obtained by same process of lithiation and heat-treatment. The relation between electrochemical performances of $Li(Ni_{0.5}Co_{0.2}Mn_{0.3})O_2$ and the primary particle morphology of precursors was analyzed by SEM, XRD and EELS. In the $Li(Ni_{0.5}Co_{0.2}Mn_{0.3})O_2$ cathode from the needle-shape precursor, the primary particle size was smaller than that from flake-shape precursor and high Li concentration at grain edge comparing grain center. The cycle and rate performances of the cathode from needle-shape precursor shows superior to those from flake-shape precursor, which might be attributed to low charge-transfer resistance by impedance measurement.
Keywords
Cathode materials; Primary particle; Morphology; Precursor; Co-precipitation method;
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