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http://dx.doi.org/10.5229/JKES.2014.17.4.222

The Structural and Electrochemical Properties of Li[Ni0.6-xBaxCo0.1Mn0.3]O2 (x = 0, 0.01) by Barium Doping  

Jang, Byeong-Chan (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Yoo, Gi-Won (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Yang, Su-Bin (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Min, Song-Gi (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.17, no.4, 2014 , pp. 222-228 More about this Journal
Abstract
Ni-rich system $Li[Ni_{1-x-y}Co_xMn_y]O_2$ of lithium secondary battery cathode material keep a high discharge capacity. However, by the Ni content increases, there is a problem that the electrochemical properties and stability of the structure are reduced. In order to solve these problems, research for positive ion doping is performed. The one of the cathode material, barium-doped $Li[Ni_{0.6-x}Ba_xCo_{0.1}Mn_{0.3}]O_2$ (x=0.01), was synthesized by the precursor, $Ni_{0.6}Co_{0.1}Mn_{0.3}(OH)_2$, from the co-precipitation method. The barium doped materials have studied the structural and electrochemical properties. The analysis of structural properties, results of X-ray diffraction analysis, and those results confirmed the change of the lattice from the binding energy in the structure by barium doping. Increased stability of the layered structure was observed by $I_{(006)}+I_{(102)}/I_{(101)}$(R-factor) ratio decrease. we expected that the electrochemical characteristics are improved. 23 mAh/g discharge capacity of barium-doped $Li[Ni_{0.6-x}Ba_xCo_{0.1}Mn_{0.3}]O_2$ (x=0.01) electrode is higher than discharge capacity of $Li[Ni_{0.6}Co_{0.1}Mn_{0.3}]O_2$ due to decrease overvoltage. And, through the structural stability was confirmed that improved the cycle characteristics. We caused a reduction in charge transfer resistance between the electrolyte and the electrode was confirmed that the C-rate characteristics are improved.
Keywords
Lithium ion battery; Cathode material; Barium doping; Co-precipitation;
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