Self-adaptive strain-relaxation optimization for high-energy lithium storage material through crumpling of graphene

Yunlong Zhao, Jiangang Feng, Xue Liu, Fengchao Wang, Lifen Wang, Changwei Shi, Lei Huang, Xi Feng, Xiyuan Chen, Lin Xu, Mengyu Yan, Qingjie Zhang, Xuedong Bai, Hengan Wu () and Liqiang Mai ()
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Yunlong Zhao: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Jiangang Feng: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Xue Liu: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Fengchao Wang: CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei
Lifen Wang: Beijing National Laboratory for Condensed Matter, Institute of Physics, Chinese Academy of Sciences
Changwei Shi: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Lei Huang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Xi Feng: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Xiyuan Chen: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Lin Xu: Harvard University
Mengyu Yan: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Qingjie Zhang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Xuedong Bai: Beijing National Laboratory for Condensed Matter, Institute of Physics, Chinese Academy of Sciences
Hengan Wu: CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei
Liqiang Mai: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract High-energy lithium battery materials based on conversion/alloying reactions have tremendous potential applications in new generation energy storage devices. However, these applications are limited by inherent large volume variations and sluggish kinetics. Here we report a self-adaptive strain-relaxed electrode through crumpling of graphene to serve as high-stretchy protective shells on metal framework, to overcome these limitations. The graphene sheets are self-assembled and deeply crumpled into pinecone-like structure through a contraction-strain-driven crumpling method. The as-prepared electrode exhibits high specific capacity (2,165 mAh g−1), fast charge-discharge rate (20 A g−1) with no capacity fading in 1,000 cycles. This kind of crumpled graphene has self-adaptive behaviour of spontaneous unfolding–folding synchronized with cyclic expansion–contraction volumetric variation of core materials, which can release strain and maintain good electric contact simultaneously. It is expected that such findings will facilitate the applications of crumpled graphene and the self-adaptive materials.

Date: 2014
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DOI: 10.1038/ncomms5565

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