On the scale of heterogeneity in composite electrodes of batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41129219.
- Also identified by DOI 10.1073/pnas.2520136122 and PMC identifier 12582338.
- Licence recorded as CC BY-NC-ND.
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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<sub>x</sub>Mn<sub>y</sub>Co<sub>z</sub>O<sub>2</sub> (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.