THESIS
2019
xxix, 157 pages : illustrations (some color) ; 30 cm
Abstract
Graphene has emerged as one of the most attractive materials for numerous applications due
to its combination of superior mechanical strength, excellent electron and heat transfer
capability, chemical and thermal stability, as well as other properties. To solve the practical
issue of agglomeration and restacking of graphene sheets in bulky and composite forms, three-dimensional
graphene networks (3DGNs) are engineered with high specific surface area,
excellent conductivity and good mechanical strength. This research work focuses on developing
novel graphene oxide (GO) - based multifunctional composites via a scalable wet extrusion
method for battery thermal management and electromagnetic interference (EMI) shielding
applications.
In this thesis dissertation, researches of synth...[
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Graphene has emerged as one of the most attractive materials for numerous applications due
to its combination of superior mechanical strength, excellent electron and heat transfer
capability, chemical and thermal stability, as well as other properties. To solve the practical
issue of agglomeration and restacking of graphene sheets in bulky and composite forms, three-dimensional
graphene networks (3DGNs) are engineered with high specific surface area,
excellent conductivity and good mechanical strength. This research work focuses on developing
novel graphene oxide (GO) - based multifunctional composites via a scalable wet extrusion
method for battery thermal management and electromagnetic interference (EMI) shielding
applications.
In this thesis dissertation, researches of synthesis, properties and applications of graphene
aerogels structures, phase change materials (PCMs), EMI shielding materials and battery
thermal management technology have been reviewed. Subsequently, novel GO-based
composites that can be applied in both battery thermal management and EMI shielding have been proposed. The work began with fabrication of graphene oxide aerogel beads (GOABs) by
an improved wet-extruding method. The as-obtained beads were subjected to thermal annealing
and absorption of liquid PCMs and collected for chemical, thermal and mechanical
characterizations. The reduced GOABs (rGOABs) infiltrated with PCMs were integrated with
thermally conductive silicone rubber for lithium ion battery (LIB) thermal management. The
combination of rGOAB/PCMs and ceramic silicone rubber provides an effective and robust
thermal management system for LIBs to avoid issues such as short-circuit, instability at high
temperature and poor mechanical impact resistance which are rarely addressed in related works.
In the meantime, reduced graphene oxide aerogel films (rGOAFs) were prepared in a similar
manner with Ferromagnetic nanoparticles and carbon nanotubes (CNTs) and infiltrated with
polymer for mechanical enhancement after thermal annealing. The lightweight mechanically
strong rGOAFs show excellent EMI shielding performance which is mainly contributed by
electromagnetic absorption.
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