Electrode microstructure controls localized electronic impedance in Li-ion batteries

Electrode microstructure controls localized electronic impedance in Li-ion batteries

Substantial heterogeneity and defects in lithium-ion battery films can be a cause of material and battery failure. Although non-uniformity has been observed previously, the physical origin of electronic impedance non-uniformities in cathode materials has not been well-studied. We show that the local...

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Bibliographic Details
Published in:Electrochimica acta Vol. 297; no. C; pp. 820 - 825
Main Authors: Vogel, John E., Forouzan, Mehdi M., Hardy, Emilee E., Crawford, Sean T., Wheeler, Dean R., Mazzeo, Brian A.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 20-02-2019
Elsevier BV
Elsevier
Subjects:
Cathodes
Electrode materials
Electrodes
Electronic conductivity
Flux density
Heterogeneity
Impedance
Ionic conductivity
Li-ion battery
Lithium
Lithium-ion batteries
Microstructure
Nonuniformity
Rechargeable batteries
Heterogeneity
Electronic conductivity
Microstructure
Li-ion battery
Ionic conductivity
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Summary:Substantial heterogeneity and defects in lithium-ion battery films can be a cause of material and battery failure. Although non-uniformity has been observed previously, the physical origin of electronic impedance non-uniformities in cathode materials has not been well-studied. We show that the local microscopic structure of materials strongly affects the resulting local impedance as measured by a micro-four-line probe, demonstrates large variation, and that these variations occur over sub-millimeter and larger distances on two different commercial cathode materials. These experimental results are further compared to modeled electronic and ionic transport pathways through the observed structure. By elucidating the extent and origins of heterogeneity in battery electrode films we provide a key principle through which batteries can be optimally designed to increase their safety, energy density, power, and longevity.
Bibliography:USDOE
AC02-05CH11231
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.11.204