The rate performance of 2D material based battery electrodes may not be as good as is commonly believed
File Type:
PDFItem Type:
Journal ArticleDate:
2020Access:
openAccessCitation:
Tian, R., Breshears, M., Horvath, D.V. & Coleman, J.N., The rate performance of 2D material based battery electrodes may not be as good as is commonly believed, ACSNano, 2020, 1 - 32Abstract:
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.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
SFI/12/RC/2278
Science Foundation Ireland (SFI)
SFI/11/PI/1087
European Union (EU)
785219
Author's Homepage:
http://people.tcd.ie/colemajDescription:
PUBLISHEDType of material:
Journal ArticleCollections
Series/Report no:
ACSNano;Availability:
Full text availableKeywords:
Nanosheet, Cathode, Anode rate, Current, Diffusivity, Diffusion coefficientSubject (TCD):
SEMICONDUCTOR DEVICES AND MATERIALSDOI:
10.1021/acsnano.9b08304Metadata
Show full item recordLicences: