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Rapid microwave-assisted bulk production of high-quality reduced graphene oxide for lithium ion batteries

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journal contribution
posted on 23.07.2020, 09:53 authored by Jiansheng Wu, Jiawei Zhao, Vaidhy VaidhyanathanVaidhy Vaidhyanathan, Hongtao ZhangHongtao Zhang, Aashu Anshuman, Avias Nare, Sina Saremi-YarahmadiSina Saremi-Yarahmadi
Graphene-based advanced electrodes with improved electrochemical properties have received increasing attention for use in lithium ion batteries (LIBs). The conventional synthesis of graphene via liquid phase exfoliation or chemical reduction of graphene oxide (GO) approaches, however, either involves prolonged processing or leads to the retainment of high-concentration oxygen functional groups (OFGs). Herein, bulk synthesis of high-quality reduced graphene oxide using microwave irradiation (MWrGO) within few seconds is reported. The electromagnetic interaction of GO with microwaves is elucidated at molecular level using reactive molecular dynamic simulations. The simulation suggests that higher power microwave irradiation results in significantly less retainment of OFGs and the formation of structural voids. The synthesized MWrGO samples are thoroughly characterized in terms of structural evolution and physicochemical properties. Specifically, a modified ID/IG-in ratio metric for Raman spectrum, wherein the intensity contribution of D’ peak is deducted from the apparent G peak, is proposed to investigate the structural evolution of synthesized MWrGO, which yields a more reliable evaluation of structural disorder over traditional ID/IG ratio. Li-ion half-cell studies demonstrate that the MWrGO is an excellent candidate for usage as high capacity anode (750.0 mAh g-1 with near-zero capacity loss) and high-performance cathode (high capacity retention of ~70% for LiCoO2 at 10 C) for LIBs.

Funding

Synthesizing 3D METAmaterials for RF, microwave and THz applications (SYMETA) : EP/N010493/1

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Materialia

Volume

13

Publisher

Elsevier

Version

VoR (Version of Record)

Rights holder

© Acta Materialia Inc.

Publisher statement

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

15/07/2020

Publication date

2020-07-16

Copyright date

2020

ISSN

2589-1529

Language

en

Depositor

Prof Vaidhy Vaidhyanathan. Deposit date: 21 July 2020