Type

Journal Article

Authors

Colm O'Dwyer
Valeria Nicolosi
Yan Zhang
Aideen Griffin
João Coelho
Dominik Horvath
Steven O'Neill
Nolito Alcala
Jonathan Coleman
Ruiyuan Tian

Subjects

Engineering

Topics
nickel oxide anode rate limitations analytic model electrical limitations cathode experimental data single walled carbon nanotubes

Quantifying the Effect of Electronic Conductivity on the Rate Performance of Nanocomposite Battery Electrodes (2020)

Abstract While it is well-known that the electronic conductivity of electrodes has a critical impact on rate performance in batteries, this relationship has been quantified only by computer simulations. Here we investigate the relationship between electrode electronic conductivity and rate performance in a model cathode system of lithium–nickel–manganese–cobalt–oxide (NMC) filled with various quantities of carbon black, single-walled carbon nanotubes, and graphene. We find extreme conductivity anisotropy and significant differences in the dependence of conductivity on mass fraction among the different fillers. Fitting capacity versus rate curves yielded the characteristic time associated with charge/discharge. This parameter increased linearly with the inverse of the out-of-plane electronic conductivity, with all data points falling on the same master curve. Using a simple mechanistic model for the characteristic time, we develop an equation that matches the experimental data almost perfectly with no adjustable parameters. This implies that increasing the electrode conductivity improves the rate performance by decreasing the RC charging time of the electrode and shows rate performance to be optimized for any electrode once σOOP > 1 S/m, a condition achieved by including <1 wt % single-walled carbon nanotubes in the electrode.
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Full list of authors on original publication

Colm O'Dwyer, Valeria Nicolosi, Yan Zhang, Aideen Griffin, João Coelho, Dominik Horvath, Steven O'Neill, Nolito Alcala, Jonathan Coleman, Ruiyuan Tian

Experts in our system

1
Colm O'Dwyer
University College Cork
Total Publications: 239
 
2
Valeria Nicolosi
Trinity College Dublin
Total Publications: 67
 
3
Yan Zhang
University College Cork
Total Publications: 7
 
4
João Coelho
Trinity College Dublin
Total Publications: 10
 
5
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
6
Ruiyuan Tian
Trinity College Dublin
Total Publications: 4