Imperial College London
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Dr Billy Wu

Faculty of Engineering, Dyson School of Design Engineering

Reader in Electrochemical Design Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6385billy.wu Website

 
 
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Location

 

1M04Royal College of ScienceSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ai:2022:10.1016/j.jpowsour.2022.231142,
author = {Ai, W and Kirkaldy, N and Jiang, Y and Offer, G and Wang, H and Wu, B},
doi = {10.1016/j.jpowsour.2022.231142},
journal = {Journal of Power Sources},
pages = {231142--231142},
title = {A composite electrode model for lithium-ion batteries with silicon/graphite negative electrodes},
url = {http://dx.doi.org/10.1016/j.jpowsour.2022.231142},
volume = {527},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Silicon is a promising negative electrode material with a high specific capacity, which is desirable for com-mercial lithium-ion batteries. It is often blended with graphite to form a composite anode to extend lifetime,however, the electrochemical interactions between silicon and graphite have not been fully investigated. Here,an electrochemical composite electrode model is developed and validated for lithium-ion batteries with asilicon/graphite anode. The continuum-level model can reproduce the voltage hysteresis and demonstratethe interactions between graphite and silicon. At high states-of-charge, graphite provides the majority of thereaction current density, however this rapidly switches to the silicon phase at deep depths-of-discharge due tothe different open circuit voltage curves, mass fractions and exchange current densities. Furthermore, operationat high C-rates leads to heterogeneous current densities in the through-thickness direction, where peak reactioncurrent densities for silicon can be found at the current collector–electrode side as opposed to the separator–electrode side for graphite. Increasing the mass fraction of silicon also highlights the beneficial impacts ofreducing the peak reaction current densities. This work, therefore, gives insights into the effects of siliconadditives, their coupled interactions and provides a platform to test different composite electrodes for betterlithium-ion batteries.
AU  - Ai,W
AU  - Kirkaldy,N
AU  - Jiang,Y
AU  - Offer,G
AU  - Wang,H
AU  - Wu,B
DO  - 10.1016/j.jpowsour.2022.231142
EP  - 231142
PY  - 2022///
SN  - 0378-7753
SP  - 231142
TI  - A composite electrode model for lithium-ion batteries with silicon/graphite negative electrodes
T2  - Journal of Power Sources
UR  - http://dx.doi.org/10.1016/j.jpowsour.2022.231142
UR  - https://www.sciencedirect.com/science/article/pii/S0378775322001604?via%3Dihub
UR  - http://hdl.handle.net/10044/1/95291
VL  - 527
ER  -
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