Type

Journal Article

Authors

Valeria Nicolosi
João Coelho
Ruiyan Tian
Sang-Hoon Park
Jonathan Coleman

Subjects

Physics

Topics
high rate electrical conductivity energy density areal capacity power density rate performance reaction diffusion electrodes

Quantifying the Trade-Off between Absolute Capacity and Rate Performance in Battery Electrodes (2019)

Abstract Among other things, battery electrodes need to display large absolute capacities coupled with high rate performance. However, enhancing areal capacity, for example via increased electrode thickness, results in reductions in rate performance. The basis for this negative correlation has not been studied in a quantitative fashion. Here, a semiempirical model is used to analyze capacity versus rate data for electrodes fabricated from a number of materials, each measured at various thicknesses. Fitting the model to the data outputs the low‐rate areal capacity, QA, and the characteristic time associated with charge/discharge, τ, fit parameters which quantify absolute capacity and rate performance respectively. A clear correlation is found between QA and τ, with all data siting close to a mastercurve approximately defined by constant τ/QA. This data is consistent with a simple model based on the timescales associated with rate‐limiting processes. This model implies that the capacity‐rate trade‐off can be improved for high areal capacity electrodes by increasing the volumetric capacity, electrical conductivity, and porosity of the electrode. Conversely, solid‐state diffusion and reaction kinetics are only important for low areal capacity electrodes.
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Full list of authors on original publication

Valeria Nicolosi, João Coelho, Ruiyan Tian, Sang-Hoon Park, Jonathan Coleman

Experts in our system

1
Valeria Nicolosi
Trinity College Dublin
Total Publications: 67
 
2
João Coelho
Trinity College Dublin
Total Publications: 10
 
3
Sang-Hoon Park
Trinity College Dublin
Total Publications: 8
 
4
Jonathan Coleman
Trinity College Dublin
Total Publications: 217