The Effect of Stress on Battery-Electrode Capacity
By Giovanna Bucci, T. Swamy, S. Bishop, Brian W. Sheldon, Y. Chiang, W. Carter. 2017
136 citations recorded by the source corpus.
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.©The During charge and discharge of lithium-ion batteries, anode and cathode materials expand and contract as they intercalate or de-intercalate Li. Graphite, the most commonly used negative electrode material, shows a volume expansion of up to 10%. 1 A much larger (up to 300%) volume change is observed in high capacity anode materials such as silicon and tin. 2,3 Even with moderate values of intercalation-induced strain, large stresses can develop within the microstructure, and eventually cause cell degradation. in
Subfields: Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/b1658ab12df746ba7f25741d12b09fb73d87fa7b
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Citations in the corpus
- Modeling of internal mechanical failure of all-solid-state batteries during electrochemical cycling, and implications for battery design (2017, background): “This a consequence of the electro-chemo-mechanical coupling [60].”