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Elasticity-related periodical Li storage behavior delivered by porous graphene

Abstract

Porous carbon materials have been widely used as active materials, additives or substrates in the energy storage devices using Li+ as charge carrier. Fluctuations in the cycling performance have been widely observed for the Li storage by porous carbon materials, but the reason for such phenomena has not been clearly revealed. In this work, periodic variations of capacities and coulombic efficiencies are observed in the lithium insertion/extraction cycles of fibre-like graphene 3D networks. Volume expansion of the nanopores in graphene networks aroused by Li+ accumulation and their elastic compression that leads to Li+ release are considered as the key reasons for the periodic behavior. For the flexible few-layered graphene, the increase of the pore volume is remained, thus leading to a continuous increase of the Li storage capacity. Our results reveal a clear relationship between the elasticity of a porous carbon material and its Li storage performance.

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Publication details

The article was received on 03 Feb 2017, accepted on 15 Apr 2017 and first published on 15 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01061C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Elasticity-related periodical Li storage behavior delivered by porous graphene

    G. Ning, Y. Cao, C. Qi, X. Ma and X. Zhu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA01061C

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