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On the scale of heterogeneity in composite electrodes of batteries

Year: 2025
Type: article
Abstract: An electrode in cylindrical or pouch cell batteries contains millions of active particles embedded in a conductive network. Battery performance, such as voltage, capacity, and cyclic efficiency, is a collective response of the particle network. We use optical microscopy to measure the local, heterogeneous state of charge of individual particles upon charging and discharging. The optical reflectivity is proportional to Li composition in the ternary oxide LiNi x Mn y Co z O 2 (NMC) cathode. Through clustering analysis, we determine the scale of heterogeneity where a representative volume in the composite electrode contains 100 to 1,000 particles. The heterogeneous activity in the particle network can be described by Weibull defect population at the particle interface with the conductive matrix.
DOI: 10.1073/pnas.2520136122
Language: English
Open Access status: hybrid
Funders: National Science Foundation, U.S. Department of Energy, Purdue University, University of Texas at Austin, Directorate for Engineering, Division of Chemical, Bioengineering, Environmental, and Transport Systems, Basic Energy Sciences, Argonne National Laboratory
Awards: G1773741141, G2649320059, G4469634620, G5164439164, Collaborative Research: Data-driven investigation of redox heterogeneity and dynamics in composite electrodes of batteries, Collaborative Research: Data-driven investigation of redox heterogeneity and dynamics in composite electrodes of batteries, G8030459065, G8495329420, G98881663
OpenAlex ID: W4415479083
FWCI: 1.352
Cites: 32
Cited by: 6
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