121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-623
Subject Enhanced performance of high capacity Li2MnO3-PVP cathode for lithium-ion batteries
Authors Ji-Eun Lee, Min-Cheol Kim, Sang-Hyun Moon, Yeon-Kyung Shin, Eun-Soo Kim, Sojeong Choi, Kyung-Won Park*
Department of Chemical Engineering, Soongsil University, Korea
Abstract Lithium-ion batteries (LIBs) are the large part of secondary battery market. LIBs are composed of cathode, anode, electrolyte, separator and current collector. As lithium ions in LIBs move through electrolyte, the batteries operate on the principle of reversible charge and discharge. In the case of cathode in LIBs , transition metal oxides have been used as cathodes. Manganese oxide-based compounds are considered to be one of the attractive cathode active materials because manganese in the transition metal is abundant in resources and is inexpensive and eco-friendly. In addition, manganese can have a high capacity because the oxidation states of manganese are diverse from +2 to +4. Li2MnO3 in Li-Mn-O compounds are characterized by a valence state of manganese equal to 4+. The structural change due to the Jahn-teller effect does not occur in Li2MnO3 because the Jahn-teller effect occurs in a valence state of manganese equal to 3+. Therefore, the Li2MnO3 exhibits a high reversible capacity without deteriorating its performance. However, Li2MnO3 exhibits low electric conductivity . To improve the electric conductivity, it synthesized with PVP. PVP is used as a carbon source to improve the electrical conductivity of Li2MnO3. PVP was heat-treated and carbonized. I found the best heat treatment temperature which showed the best performance by changing the heat treatment temperature. The composites were analyzed by scanning electron microscope, transmission electron microscope and X - ray diffractometer. Characterization of the cathode active material was carried out by charge - discharge evaluation and cyclic scanning analysis. The electrochemical performance of the samples as cathodes in LIBs was evaluated by charge/discharge test and CVs.
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