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SiOC Nanolayers Wrapped 3D Interconnected Graphene Sponge as High Performance Anodes for Lithium Ion Batteries

Abstract

Silicon oxycarbides (SiOCs) are promising anode materials for high-energy LIBs for their high theoretical capacity. However, due to the intrinsically poor electronic conductivity, the battery performance is often restricted. Herein, high performance anodes are demonstrated by designing hierarchical 3D interconnected structure using graphene sponge as scaffold. The graphene sponge was infiltrated with polysiloxane precursor and further converted to porous frameworks consisted of mutli-layered sandwich-like nanosheets (SiOC@Graphene@SiOC) by the following pyrolysis. The deliberate structure not only improved the electrical conductivity, accelerated ion insertion, shortened ionic diffusion distance but also endowed full utilization of SiOC active sites in the anode. The 3D-GNS/SiOC anodes exhibited excellent electrochemical performance, including high initial discharge capacity (1280 mAh g-1 at 0.1 A g-1), high reversibility and stability (701 mAh g-1/371 μAhcm-2 after 100 cycles) and extreme rate-performance (656 mAh g-1 /348 μAhcm-2 at 0.5 A g-1). For full-cells, high initial charge capacity (680 mAh g-1 at 0.5 A g-1) and high stability (416 mAh g-1 at 0.5A g-1 after 100 cycles) were obtained. Significantly, this simple and scalable method can be extended to fabricate high-rate and long-cycle SiOC or other anode materials for commercial LIBs.

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Publication details

The article was received on 14 Feb 2018, accepted on 12 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01570H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    SiOC Nanolayers Wrapped 3D Interconnected Graphene Sponge as High Performance Anodes for Lithium Ion Batteries

    Z. Sang, Z. Zhao, D. Su, P. Miao, F. Zhang, H. Ji and X. Yan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01570H

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