Lithium insertion into dense and porous carbon-rich polymer-derived SiOC ceramics |
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| Authors: | P Dibandjo M Graczyk-Zajac R Riedel VS Pradeep GD Soraru |
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| Affiliation: | 1. Dipartimento di Ingegneria dei Materiali e Tecnologie Industriali, Università di Trento, Via Mesiano, 77 – 38050 Trento, Italy;2. Institut für Materialwissenschaft, Fachgebiet Disperse Feststoffe, Technische Universität Darmstadt, Petersenstr. 23, 64287 Darmstadt, Germany;1. IFW-Dresden, Institute for Solid State Research, PF 270116, 01171 Dresden, Germany;2. Technische Universität Darmstadt, Fachbereich Material- und Geowissenschaften, Fachgebiet Disperse Feststoffe, Jovanka-Bontschits-Straße 2, 64287 Darmstadt, Germany;3. Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany;1. Department of Physics, Konkuk University, Seoul 05029, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;3. Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology, Jinju-si 52851, Republic of Korea;1. Dow Corning Toray Company, Ltd., Kishi, Yamakita 258-0112, Japan;2. Department of Applied Chemistry, Tokyo Metropolitan University, Minami-Osawa, Hachioji, Tokyo 192-0397, Japan;1. Institut für Materialwissenschaft, Technische Universität Darmstadt, Disperse Feststoffe, Jovanka-Bontschits-Straße 2, 64287 Darmstadt, Germany;2. Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, Schnittspahnstraße 9, 64287 Darmstadt, Germany |
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| Abstract: | Two polymer-derived SiOC ceramics with different amount of carbon were synthesized either as dense or porous SiOC powders. The dense materials were produced up to a maximum temperature of 1400 °C and show a phase separated nanostructure consisting of SiO2-rich clusters, nanocrystalline SiC and nanocrystalline carbon phase. The corresponding porous materials were obtained by etching the silica phase of the dense SiOC with 20% HF solution. The electrochemical properties of the dense and porous SiOC ceramics in terms of lithium insertion/extraction were studied. Accordingly, the SiOC materials show a first lithium insertion capacity between 380 and 648 mAh g?1 followed by significantly lower extraction capacities between 102 and 272 mAh g?1. We consider the free carbon phase present in the ceramic as the major lithium intercalating agent. The porous samples show a stable electrochemical behavior up to 30 cycles while for the dense materials the efficiency drops to almost zero after 10 cycles. |
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