Resilient aligned carbon nanotube/graphene sandwiches for robust mechanical energy storage

Cheng Tang, Qiang Zhang, Meng Qiang Zhao, Gui Li Tian, Fei Wei

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

The use of microscale flexible mechanical energy storage devices, instead of traditional electrochemical energy storage devices based on supercapacitors and Li-ion batteries, is highly considered for portable electronics, actuators, and meso-micro scale systems. The selection of resilient and robust building blocks is the first step for high energy-density mechanical energy storage system. Herein, alternative aligned carbon nanotubes (CNTs) and graphene were effectively sandwiched into freestanding sp2 all-carbon hybrids, rendering the excellent loading transfer in the three-dimensional framework. The millimeter-scale aligned CNT/graphene sandwiches could be repeatedly compressed at high strains (ε>90%), with a highest energy absorption density of 237.1kJkg-1, an ultrahigh power density of 10.4kWkg-1, and a remarkable efficiency of 83% during steady operation, providing novel nanocomposites with outstanding mechanical energy storage performance comparable to electrochemical batteries and bridging nanoscopic structures to micro- and mesoscale applications.

Original languageEnglish (US)
Pages (from-to)161-169
Number of pages9
JournalNano Energy
Volume7
DOIs
StatePublished - Jul 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering

Keywords

  • Carbon nanotube
  • Energy storage
  • Graphene
  • Hierarchical nanostructures
  • Hybrid

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