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

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-relax...

Full description

Saved in:
Bibliographic Details
Published in:Nature communications 2014-08, Vol.5 (1), p.4565-4565, Article 4565
Main Authors: Zhao, Yunlong, Feng, Jiangang, Liu, Xue, Wang, Fengchao, Wang, Lifen, Shi, Changwei, Huang, Lei, Feng, Xi, Chen, Xiyuan, Xu, Lin, Yan, Mengyu, Zhang, Qingjie, Bai, Xuedong, Wu, Hengan, Mai, Liqiang
Format: Article
Language:English
Subjects:
121/135
121/143
639/301/299/891
639/925/918
Batteries
Electrodes
Electrons
Energy storage
Graphene
Humanities and Social Sciences
Laboratories
Lithium
Microscopy
multidisciplinary
Science
Science (multidisciplinary)
Sulfur
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. Crumpled graphene structures are promising for electrochemical energy storage. Here, the authors synthesize deeply crumpled pinecone-like graphene sheets, which show self-adaptive folding-unfolding behaviours in cycling leading to robust battery performances.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms5565