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[Element] #269
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Please submit a reference and the equation for a proposed element! Attaching an example data set is also usually helpful :)
Element: Restricted Diffusion Element (aka finite-length diffusion element)
Reference: Vicente, N.; Haro, M.; Garcia-Belmonte, G. New Approaches to the Lithiation Kinetics in Reaction-Limited Battery Electrodes through Electrochemical Impedance Spectroscopy. Chem. Commun. 2018, 54 (9), 1025–1040. https://doi.org/10.1039/C7CC08373D.
Picture of Equation (Equation 5 in the reference):
![Restricted Diffusion Element Equation](https://private-user-images.githubusercontent.com/138038985/249574067-00630a35-505f-454b-8fbb-a6b69479588e.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjA0NTM5NzgsIm5iZiI6MTcyMDQ1MzY3OCwicGF0aCI6Ii8xMzgwMzg5ODUvMjQ5NTc0MDY3LTAwNjMwYTM1LTUwNWYtNDU0Yi04ZmJiLWE2YjY5NDc5NTg4ZS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwNzA4JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDcwOFQxNTQ3NThaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1lZmYxYTk4NjMzODg1NGFmYjI4ZjQyOWVjZTlmNTM0Y2I4NTcxMTM5NTQ4Y2U2NzIzMGYzMTc1MTEzZWZkOTdiJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.T4cl01MJz0Nphv5NWuWqjj4XQCO6Q3XxgvotptJSLW8)
This element is one of the options in EC-lab (there it's called the modified restricted diffusion element). It's the more general case of the open (finite-space) Warburg element in impedance.py, with the parameter gamma added to account for non-ideality.
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