Reduction of tortuosity in porous electrodes through macropore patterning

Erik R. Reale, Kyle C. Smith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In porous electrodes, limitations exist on how quickly ionic current can be transferred through electrolyte, partly determined by the "tortuosity," a factor describing the effective length an ion must travel through the microstructure's pores. To facilitate ionic conduction and adsorption into electric double-layers, we show that macroscopic pores can be added to reduce the effective tortuosity by providing more direct paths to capacitive interfaces. We show experimental and simulated results in fabricating and testing electrodes that are machined to create these macro-pores aligned normal to current collectors. Through the reduction of tortuosity, these "bi-tortuous" electrodes surpass unpatterned electrodes in effective conductivity, rate capability, and capacitance. The degree of improvement is dependent on the electrodes' thickness and the time scale of the charging.

Original languageEnglish (US)
Title of host publicationECS Transactions
EditorsJ. A. Staser, D. Riemer
PublisherElectrochemical Society Inc.
Pages133-153
Number of pages21
Edition4
ISBN (Print)9781607688327
DOIs
StatePublished - 2018
EventSymposium on Industrial Electrochemistry and Electrochemical Engineering General Session - 233rd ECS Meeting - Seattle, United States
Duration: May 13 2018May 17 2018

Publication series

NameECS Transactions
Number4
Volume85
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Other

OtherSymposium on Industrial Electrochemistry and Electrochemical Engineering General Session - 233rd ECS Meeting
CountryUnited States
CitySeattle
Period5/13/185/17/18

ASJC Scopus subject areas

  • Engineering(all)

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