Facile Synthesis and High Rate Capability of Silicon Carbonitride/Boron Nitride Composite with a Sheet-Like Morphology

Abstract : We report synthesis of a sheet-like composite composed of hexagonal boron nitride (or BN) chemically integrated with silicon carbonitride (SiCN) matrix via a simple pyrolysis route. The composite offers several unique features such as improved electrical conductivity, high-temperature oxidation resistance (at 1000 degrees C), and high electrochemical activity toward Li-ions generally not observed in SiCN or boron-doped SiCN. Tested as electrode in Li-ion half-cell, SiCN/BN show charge capacity of similar to 517 mAh g(-1) at 100 mA g(-1) and 283 mAh g(-1) at 2400 mA g(-1) with respect to total weight of electrode. Additionally, a stable charge capacity of similar to 401 mAh g(-1) at 100 mA g(-1) is retained even after continuous operation for 1000 cycles at 1600 mA g(-1). Chemical characterization of the composite suggests that addition of BN to polysilazane in moderate amounts (similar to 10 wt %) and subsequent pyrolysis resulted in an increased free-carbon content in the amorphous SiCN phase, which exceeded the percolation limit, leading to the improved electrical conductivity and Li-reversible capacity.
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Article dans une revue
Journal of Physical Chemistry C, American Chemical Society, 2015, 119 (5), pp.2783-2791. 〈10.1021/jp508075x〉
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Soumis le : mardi 16 février 2016 - 16:17:48
Dernière modification le : samedi 11 novembre 2017 - 01:13:54

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Lamuel David, Samuel Bernard, Christel Gervais, Philippe Miele, Gurpreet Singh. Facile Synthesis and High Rate Capability of Silicon Carbonitride/Boron Nitride Composite with a Sheet-Like Morphology. Journal of Physical Chemistry C, American Chemical Society, 2015, 119 (5), pp.2783-2791. 〈10.1021/jp508075x〉. 〈hal-01275034〉

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