Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 10, Pages 2495-2503Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.03.010
Keywords
Li-ion battery; Anode; SiOC; Polymer-derived ceramic
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Funding
- European Community, through a Marie Curie Research and Training Network PolyCer-Net [MRTN-CT-019601]
- Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany [SFB 595/A4]
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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 degrees 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. (C) 2012 Elsevier Ltd. All rights reserved.
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