TY - JOUR
T1 - Inelastic shape changes of silicon particles and stress evolution at binder/particle interface in a composite electrode during lithiation/delithiation cycling
AU - Wang, Hailong
AU - Nadimpalli, Siva P.V.
AU - Shenoy, Vivek B.
N1 - Funding Information:
The authors gratefully acknowledge support of this work by the National Science Foundation ( DMS-0914648 ), and the Department of Energy EPSCoR Implementation Grant ( DE-SC0007074 ). SPVN would like to acknowledge the support of New Jersey Institute of Technology through the faculty startup grant.
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/12/1
Y1 - 2016/12/1
N2 - Inelastic shape changes of Si particles and stress evolution at binder/particle interface was modeled using coupled diffusion–stress framework available in finite element software. A simple model that contains two spherical Si particles with and without the polymer binder film was used to represent the composite electrode. The particles were lithiated and delithiated at two different rates: one representing a slow charging case which results in a uniform Li concentration throughout the Si particles and the other representing a fast charging condition which results in non-uniform lithium concentration within the spherical Si particles. The inelastic shape changes and associated contact forces predicted by the model are qualitatively consistent with experimental data. Further, the effect of binder mechanical properties and the binder fraction on the stress evolution in Si particles and at the binder/particle interface was calculated. The proposed model, although simple, can guide a battery design engineer to choose a proper binder, charge/discharge strategy, and binder fraction for a durable electrode design.
AB - Inelastic shape changes of Si particles and stress evolution at binder/particle interface was modeled using coupled diffusion–stress framework available in finite element software. A simple model that contains two spherical Si particles with and without the polymer binder film was used to represent the composite electrode. The particles were lithiated and delithiated at two different rates: one representing a slow charging case which results in a uniform Li concentration throughout the Si particles and the other representing a fast charging condition which results in non-uniform lithium concentration within the spherical Si particles. The inelastic shape changes and associated contact forces predicted by the model are qualitatively consistent with experimental data. Further, the effect of binder mechanical properties and the binder fraction on the stress evolution in Si particles and at the binder/particle interface was calculated. The proposed model, although simple, can guide a battery design engineer to choose a proper binder, charge/discharge strategy, and binder fraction for a durable electrode design.
KW - Binder/particle interface stress
KW - Composite electrode model
KW - Finite element method
KW - Li-ion battery
KW - Plastic deformation of lithiated Si
KW - Stress–diffusion
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U2 - 10.1016/j.eml.2016.03.020
DO - 10.1016/j.eml.2016.03.020
M3 - Article
AN - SCOPUS:84962037334
SN - 2352-4316
VL - 9
SP - 430
EP - 438
JO - Extreme Mechanics Letters
JF - Extreme Mechanics Letters
ER -