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  • 标题:Incommensurate Graphene Foam as a High Capacity Lithium Intercalation Anode
  • 本地全文:下载
  • 作者:Tereza M. Paronyan ; Arjun Kumar Thapa ; Andriy Sherehiy
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2017
  • 卷号:7
  • 期号:1
  • DOI:10.1038/srep39944
  • 语种:English
  • 出版社:Springer Nature
  • 摘要:Graphite's capacity of intercalating lithium in rechargeable batteries is limited (theoretically, 372 mAh g(-1)) due to low diffusion within commensurately-stacked graphene layers. Graphene foam with highly enriched incommensurately-stacked layers was grown and applied as an active electrode in rechargeable batteries. A 93% incommensurate graphene foam demonstrated a reversible specific capacity of 1,540 mAh g(-1) with a 75% coulombic efficiency, and an 86% incommensurate sample achieves above 99% coulombic efficiency exhibiting 930 mAh g(-1) specific capacity. The structural and binding analysis of graphene show that lithium atoms highly intercalate within weakly interacting incommensurately-stacked graphene network, followed by a further flexible rearrangement of layers for a long-term stable cycling. We consider lithium intercalation model for multilayer graphene where capacity varies with N number of layers resulting LiN+1C2N stoichiometry. The effective capacity of commonly used carbon-based rechargeable batteries can be significantly improved using incommensurate graphene as an anode material.
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