Type

Journal Article

Authors

Valeria Nicolosi
Jonathan Coleman

Subjects

Chemistry

Topics
literature processes motion diffusion coefficients batteries battery electrodes factors

Quantifying the factors limiting rate-performance in battery electrodes (2019)

Abstract One weakness of batteries is the rapid falloff in charge-storage capacity with increasing charge/discharge rate. Rate performance is related to the timescales associated with charge/ionic motion in both electrode and electrolyte. However, no general fittable model exists to link capacity-rate data to electrode/electrolyte properties. Here we demonstrate an equation which can fit capacity versus rate data, outputting three parameters which fully describe rate performance. Most important is the characteristic time associated with charge/discharge which can be linked by a second equation to physical electrode/electrolyte parameters via various rate-limiting processes. We fit these equations to ~200 data sets, deriving parameters such as diffusion coefficients or electrolyte conductivities. It is possible to show which rate-limiting processes are dominant in a given situation, facilitating rational design and cell optimisation. In addition, this model predicts the upper speed limit for lithium/sodium ion batteries, yielding a value that is consistent with the fastest electrodes in the literature.
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Full list of authors on original publication

Valeria Nicolosi, Jonathan Coleman

Experts in our system

1
Valeria Nicolosi
Trinity College Dublin
Total Publications: 67
 
2
Jonathan Coleman
Trinity College Dublin
Total Publications: 217