Type

Journal Article

Authors

Dominik V. Horvath
Madeleine Breshears
Ruiyuan Tian
Jonathan Coleman

Subjects

Physics

Topics
diffusivity cathode semiconductor devices and materials diffusion coefficient anode rate nanosheet high rate current

The rate performance of 2D material based battery electrodes may not be as good as is commonly believed (2020)

Abstract Two-dimensional (2D) materials show great potential for use in battery electrodes and are believed to be particularly promising for high-rate applications. However, there does not seem to be much hard evidence for the superior rate performance of 2D materials compared to non-2D materials. To examine this point, we have analyzed published rate-performance data for a wide range of 2D materials as well as non-2D materials for comparison. For each capacity–rate curve, we extract parameters that quantify performance which can then be analyzed using a simple mechanistic model. Contrary to expectations, by comparing a previously proposed figure of merit, we find 2D-based electrodes to be on average ∼40 times poorer in terms of rate performance than non-2D materials. This is not due to differences in solid-state diffusion times which were similarly distributed for 2D and non-2D materials. In fact, we found the main difference between 2D and non-2D materials is that ion mobility within the electrolyte-filled pores of the electrodes is significantly lower for 2D materials, a situation which we attribute to their high aspect ratios.
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Full list of authors on original publication

Dominik V. Horvath, Madeleine Breshears, Ruiyuan Tian, Jonathan Coleman

Experts in our system

1
Ruiyuan Tian
Trinity College Dublin
Total Publications: 4
 
2
Jonathan Coleman
Trinity College Dublin
Total Publications: 217