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Experimental Visualization of Commercial Lithium Ion Battery Cathodes: Distinguishing Between the Microstructure Components Using Atomic Force Microscopy
journal contribution
posted on 2020-06-29, 16:12 authored by J.S. Terreblanche, D.L. Thompson, I.M. Aldous, J. Hartley, A.P. Abbott, K.S. RyderThe integration of
lithium-ion batteries (LIB) into transportation
through the implementation of hybrid and electric vehicles is driving
fundamental research into improving their performance and lifetime.
The rapid production of new electric vehicles by several popular brands
also raises the question of how much material will eventually need
to be reused or recycled. With a combination of an enhanced fundamental
analysis of commercially utilized electrodes with fundamental chemical
knowledge, answers to the scientific material challenges of lithium
ion batteries will aid in not only the implementation of battery powered
electrical transport but also the development of end of life recycling
processes. Here, using quantitative nanomechanical and conductive
atomic force microscopy, which are nondestructive and rapid techniques,
the different components of the composite electrode are unveiled at
the nanoscale, identifying the mechanism by which the active material
binds together and how the conductive network is formed. Changes in
the polymer binder network are observed in an aged cell and are shown
to affect the mechanical integrity of the electrode structure, which
can lead to the failure of the electrode. The links between nanomechanical
and macro-mechanical properties were evaluated using a scratch test
and optical microscopy to show that the mechanical integrity of the
aged cell was weaker than that of the untouched cell.
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Keywords
polymer binder networkLIBnanomechanicalconductive networkMicrostructure Componentslife recycling processesExperimental VisualizationimplementationCommercial Lithium Ion Battery Cathodesmaterial challengesvehicleAtomic Force Microscopymacro-mechanical propertiesscratch testlithium ion batteriesforce microscopyintegritylithium-ion batterieschemical knowledgeelectrode structure
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