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http://dx.doi.org/10.5229/JKES.2020.23.2.47

Effect of Electrode Design on Electrochemical Performance of Highly Loaded LiCoO2 Positive Electrode in Lithium-ion Batteries  

Kim, Haebeen (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
Ryu, Ji Heon (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
Publication Information
Journal of the Korean Electrochemical Society / v.23, no.2, 2020 , pp. 47-55 More about this Journal
Abstract
Highly loaded LiCoO2 positive electrodes are prepared to construct high-energy density lithium-ion batteries, their electrochemical performances are evaluated. For the standard electrode, a loading of about 2.2 mAh/㎠ is used, and for a high-loading electrode, an electrode is manufactured with a loading level of about 4.4 mAh/㎠. The content of carbon black as electronic conducting additive, and the porosity of the electrode are configured differently to compare the effects of electron conduction and ionic conduction in the highly loaded LiCoO2 electrode. It is expected that the electrochemical performance is improved as the amount of the carbon black increases, but the specific capacity of the LiCoO2 electrode containing 7.5 weight% carbon black is rather reduced. When the conductive material is excessively provided, an increase of electrode thickness by the low content of the LiCoO2 active material in the same loading level of the electrode is predicted as a cause of polarization growth. When the electrode porosity increases, the path of ionic transport can be extended, but the electron conduction within the electrode is disadvantageous because the contact between the active material and the carbon black particles decreases. As the electrode porosity is lowered through the sufficient calendaring of the electrode, the electrochemical performance is improved because of the better contact between particles in the electrode and the reduced electrode thickness. In the electrode design for the high-loading, it is very important to construct the path of electron conduction as well as the ion transfer and to reduce the electrode thickness.
Keywords
High-Loading Electrode; Electronic Conduction; Carbon Black; Electrode Porosity; Lithium-Ion Batteries;
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Times Cited By KSCI : 2  (Citation Analysis)
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