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Facile assembly of layer-interlocked graphene heterostructures as flexible electrodes for Li-ion batteries

Abstract

Flexible electrodes with robust mechanical properties and high electrochemical performance are of significance for practical implementation of flexible batteries. Here we demonstrate a general and straightforward co-assembly approach to prepare flexible electrodes, where electrochemically exfoliated graphene (EG) is exploited as the film former/conducting matrix and different binary metal oxides (Li4Ti5O12, LiCoO2, Li2MnO4, LiFePO4) are incorporated. The resultant EG-metal oxide hybrids exhibit a unique layer-interlocked structure, where metal oxide is conformably wrapped by the highly flexible graphene. Due to numerous contact interphases generated between EG and intercalated material, the hybrid films show high flexibility, which can endure rolling, bending, folding and even twisting. When serving as the anode for Li-ion batteries, the freestanding EG-Li4Ti5O12 hybrid presents a characteristic flat discharge plateau at 1.55 V (vs Li/Li+), indicating transformation of Li4Ti5O12 to Li7Ti5O12. Small polarization, high rate capability and excellent cycling stability against mechanical bending are also demonstrated for the prepared EG-Li4Ti5O12 hybrid. Finally, full cells composing of EG-Li4Ti5O12 and EG-LiFePO4 hybrids show impressive cycling (98% capacity retention after 100 cycles at 1C) and rate performance (84% capacity retained at 2.5C). The straightforward co-assembly approach based on EG can be extended to other two-dimensional layered materials for constructing high-efficient flexible energy storage devices.

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Supplementary files

Article information


Submitted
12 Nov 2019
Accepted
06 Dec 2019
First published
06 Dec 2019

This article is Open Access

Faraday Discuss., 2019, Accepted Manuscript
Article type
Paper

Facile assembly of layer-interlocked graphene heterostructures as flexible electrodes for Li-ion batteries

G. Wang, G. Chen, S. Yang, P. Zhang, F. Wang, A. Shaygan Nia, M. Yu and X. Feng, Faraday Discuss., 2019, Accepted Manuscript , DOI: 10.1039/C9FD00120D

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