Irreversible capacity loss of graphite electrode in lithium-ion batteries |
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| Affiliation: | 1. School of Materials Science and Engineering, Zhengzhou University, 100 Science Road, Zhengzhou, 450001, P.R. China;2. School of Materials Science and Engineering, Dongguan University of Technology, 1 Daxue Road, Dongguan, 523808, P.R. China;1. College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China;2. College of chemistry and chemical engineering, Xinxiang University, Xinxiang, Henan 453033, China;1. Mercedes-Benz AG, Neue Straße 95, 73230 Kirchheim unter Teck, Germany;2. Fachgebiet Disperse Feststoffe, Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt, Otto-Berndt-Str. 3, 64287, Darmstadt, Germany;3. Institute of Thermal Process Engineering, KIT, Kaiserstraße 12, 76131 Karlsruhe, Germany |
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| Abstract: | The irreversible capacity loss of the carbon electrode in lithium-ion batteries at the first cycle is caused mostly by surface film growth. We inspected an unknown irreversible capacity loss (UICL) of the natural graphite electrodes. The charge/discharge behavior of graphite and meso-phase carbon microbeads heat-treated at 2800°C (MCMB28) as the materials of the carbon anode in the lithium-ion battery were compared. It was found that the capacity loss of the natural graphite electrode in the first cycle is caused not only by surface film growth, but also by irreversible lithium-ion intercalation on the new formed surface at the potential range of lithium intercalation, while the capacity loss of the MCMB28 electrode is mainly originated from surface film growth. The reason for the difference of their irreversible capacity losses of these two kinds of carbon material was explained in relation to their structural characteristics. |
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