Quantifying tortuosity in porous Li-ion battery materials

By Indrajeet V. Thorat, D. Stephenson, N. Zacharias, Karim Zaghib, John N. Harb, D. Wheeler. 2009

504 citations recorded by the source corpus.

An accurate assessment of liquid-phase mass transport resistances is necessary for understanding and optimizing battery performance using mathematical models. This work combines modeling and experiments to quantify tortuosity in electrolyte-filled porous battery structures (separator and active-material film). Tortuosities of separators were measured by two methods, AC impedance and polarization-interrupt, which produced consistent results. We measured an apparent interfacial resistance at the lithium metal electrodes that contributed to both ohmic and diffusional resistance of the cell. The polarization-interrupt experiment was used similarly to measure effective electrolyte transport in porous films of cathode materials, particularly films containing LiFePO4. An empirical relationship between porosity and the tortuosity of the porous structures was developed. Our results demonstrate that the tortuosity-dependent mass transport resistance in porous separators and electrodes is significantly higher than that predicted by the oft-used Bruggeman relationship.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/b87663750e8aa16fa469a919cdac284f8b5a0c07

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In Automotive Engineering

1. Yi Cui
2. Yuzhang Li
3. D. Brett
4. Bernhard Tjaden
5. Hansen Wang
6. Allen Pei
7. Dingchang Lin
8. David G. Mackanic

In Electrical and Electronic Engineering

1. Yi Cui
2. D. Brett
3. Bernhard Tjaden
4. Allen Pei
5. Yuzhang Li
6. Hansen Wang
7. Paul R. Shearing
8. Dingchang Lin

Citations in the corpus

• Tortuosity in electrochemical devices: a review of calculation approaches (2018, methodology): “53 [47] as discussed in section ‘Poros-”
• Tortuosity Effects in Lithium-Metal Host Anodes (2020, methodology): “For polarization-interruption mode, the GOA-embedded PTFE O-ring was placed between two Celgard 2325 separator-coated Li metal, soaked by electrolyte, and assembled into cells.(34,36) The assembled cells were tested with a battery tester.”