The Effect of Stress on Battery-Electrode Capacity
Name
J. Electrochem. Soc.-2017-Bucci-A645-54.pdf
Size
1.2 MB
Format
Adobe PDF
Checksum (MD5)
0395761839803a7fa238432c1e888b7f
Author(s)
Sheldon, Brian W.
Bucci, Giovanna
Swamy, Tushar
Bishop, Sean
Chiang, Yet-Ming
Carter, W Craig
Date Issued
February 2017
Journal
Journal of The Electrochemical Society
Publisher
Electrochemical Society
Citation
Bucci, Giovanna et al. “The Effect of Stress on Battery-Electrode Capacity.” Journal of The Electrochemical Society 164, 4 (2017): A645–A654 © 2017 Electrochemical Society
Version
Final published version
Abstract
Constraint-induced stresses develop during Li-ion battery cycling, because anode and cathode materials expand and contract as they intercalate or de-intercalate Li. We show in this manuscript that these stresses, in turn, can significantly modify the maximum capacity of the device at a given cell voltage. All-solid-state batteries impose an external elastic constraint on electrode particles, promoting the development of large stresses during cycling. We employ an analytic and a finite element model to study this problem, and we predict that the electrode's capacity decreases with increasing matrix stiffness. In the case of lithiation of a silicon composite electrode, we calculate 64% of capacity loss for stresses up to 2 GPa. According to our analysis, increasing the volume ratio of Si beyond 25-30% has the effect of decreasing the total capacity, because of the interaction between neighboring particles. The stress-induced voltage shift depends on the chemical expansion of the active material and on the constraint-induced stress. However, even small voltage changes may result in very large capacity shift if the material is characterized by a nearly flat open-circuit potential curve. Keywords: Finite element modeling; Li-ion battery; Solid electrolyte; Stress-potential coupling; Thermodynamics
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1149/2.0371704JES
