Abstract
Herein we present a study on polymer-derived silicon oxycarbide (SiOC)/graphite composites for a potential application as an electrode in high power energy storage devices, such as Lithium-Ion Capacitor (LIC). The composites were processed using high power ultrasound-assisted sol-gel synthesis followed by pyrolysis. The intensive sonication enhances gelation and drying process, improving the homogenous distribution of the graphitic flakes in the preceramic blends. The physicochemical investigation of SiOC/graphite composites using X-ray diffraction, 29Si solid state NMR and Raman spectroscopy indicated no reaction occurring between the components. The electrochemical measurements revealed enhanced capacity (by up to 63%) at high current rates (1.86 A g−1) recorded for SiOC/graphite composite compared to the pure components. Moreover, the addition of graphite to the SiOC matrix decreased the value of delithiation potential, which is a desirable feature for anodes in LIC.
Highlights
Over the past few years, there has been increasing interest in small high-power energy storage devices
The electrochemical measurements revealed enhanced capacity at high current rates (1.86 A g−1 ) recorded for silicon oxycarbide (SiOC)/graphite composite compared to the pure components
The addition of graphite to the SiOC matrix decreased the value of delithiation potential, which is a desirable feature for anodes in lithium-ion capacitor (LIC)
Summary
Over the past few years, there has been increasing interest in small high-power energy storage devices. The material should exhibit excellent rate capability to match the pace of cathodic reaction, and withstand polarization with 1–2 A g−1 for at least a few hundred cycles [11] Having these requirements in mind, several solutions have been tested, those originally applied in lithium-ion batteries. Pure PDCs have been tested as a material for lithium-ion batteries [27,28,29] and lithium-ion capacitors [30] as they exhibit high capacity up to 920 mAh g−1 , good cyclability and good rate capability. The new SiOC/graphite composite exhibited improved rate capability and high capacity in a lower potential range than pure SiOC, which makes it a promising candidate for negative electrodes in LIC
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