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Coalescence in Hybrid Materials: The Key to High-Capacity Electrodes

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journal contribution
posted on 21.11.2018 by Timotheus Jahnke, Andrea Knöller, Stefan Kilper, Dirk Rothenstein, Marc Widenmeyer, Zaklina Burghard, Joachim Bill
The rising demand for flexible electronic devices requires the development of bendable lithium-ion batteries (LIBs), in which paperlike electrodes exhibit a high electrochemical storage capacity coupled with excellent mechanical flexibility. Along this line, this work proposes a novel fabrication method for self-supporting paperlike anodes, which are exclusively made from active materials. Metastable SnClx­(OH)yOz precursor particles and graphene oxide (GO) sheets are assembled in a facile and low-cost way, leading to paperlike hybrid materials. Subsequent annealing at 500 °C under an argon atmosphere reduces the GO simultaneously with the transformation of the metastable precursor to tin dioxide (SnO2) via a direct oxygen transfer mechanism between the two components. This oxygen transfer is accompanied by the anchoring of the SnO2 particles onto the reduced GO (rGO) sheets, yielding an excellent synergy among mechanical stability, electrical conductivity, and electrochemical capacity of the hybrid material. The latter reaches values of up to 700 mAh g–1 due to the coalescence of two components during the fabrication process. These findings qualify this novel fabrication strategy to be also transferred to other electrochemically active systems, which require simultaneous mechanical stability and high storage capacity.