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Rapid microwave-assisted bulk production of high-quality reduced graphene oxide for lithium ion batteries
journal contribution
posted on 2020-07-23, 09:53 authored by Jiansheng Wu, Jiawei Zhao, Vaidhy VaidhyanathanVaidhy Vaidhyanathan, Hongtao ZhangHongtao Zhang, Aashu Anshuman, Avias Nare, Sina Saremi-YarahmadiSina Saremi-YarahmadiGraphene-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
MaterialiaVolume
13Publisher
ElsevierVersion
- 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
2020-07-15Publication date
2020-07-16Copyright date
2020ISSN
2589-1529Publisher version
Language
- en
Depositor
Prof Vaidhy Vaidhyanathan. Deposit date: 21 July 2020Usage metrics
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