ae9b01695_si_001.pdf (922.97 kB)
Effective Mass Transport Properties in Lithium Battery Electrodes
journal contribution
posted on 2019-12-30, 20:45 authored by Md. Sazzad Hossain, Lisa I. Stephens, Mojgan Hatami, Mohammadreza Ghavidel, Danny Chhin, Jeremy I. G. Dawkins, Laurence Savignac, Janine Mauzeroll, Steen B. SchougaardLithium ion battery performance becomes increasingly
limited by
ionic transport as the current demand increases. Especially detrimental
is the transport within the liquid electrolyte that fills the porous
electrode, yet reliable measurement of practical lithium diffusivity
within this complex structure has been a longstanding challenge. In
this work, we have developed a “single sided” analytical
technique to determine the diffusivity in porous networks using scanning
electrochemical microscopy (SECM) and a molecular redox marker. SECM
surface mapping of porous films shows measurement consistency, and
diffusion limited currents through a test structure with well-defined
geometry matches the results of numerical modeling within 10%. Diffusivity
measurement shows significant deviation from the Bruggeman model for
porosities below 60%. The developed technique is applicable to all
porous structures independent of their electronic conductivity. Importantly,
for lithium-ion batteries the technique does not require free-standing
electrodes and therefore is applicable to industrially relevant high
power electrodes as a tool for optimization as well as for quality
control.
History
Usage metrics
Categories
Keywords
lithium diffusivityquality controlBruggeman modelscanning electrochemical microscopySECM surface mappingtechniqueLithium Battery Electrodes Lithium ion battery performancedemand increasesmeasurement consistencytest structureredox markerpower electrodeslithium-ion batteriesEffective Mass Transport Properties
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC