Mechanical properties and electrochemical performance
We study the fundamental relationships between mechanical properties and electrochemical performance of energy storage systems. By focusing on complete battery cells rather than individual electrodes, we can understand the interactions between the battery components and optimize overall system performance.
Featured news and publications
Stress evolution and capacity fade in constrained lithium-ion pouch cells
J. Cannarella and C. B. Arnold, J. Power Sources (2014) illustrates the coupling between mechanical stresses on full lithium-ion pouch cells and their resulting performance. Specifically, we show that initial stack pressures influence how stress evolves during cycling, and that high stack stresses result in faster capactiy fade. | Full text | View at publisher
Transport properties of battery separators
J. Cannarella and C. B. Arnold, J. Power Sources (2013) measures the impedance of mechanically deformed separators as a function of mechanical deformation. A relationship between impedance and deformation based on the Bruggeman tortuosity-porosity relationship is derived and verified experimentally. Because mechanical deformation can be used to vary separator porosity this technique is able to measure fundamental Bruggeman parameters. | Full text | View at publisher
Feature on Li+ battery mechanics research
The Arnold Group's research on stress-induced pore closure in lithium-ion battery separators, was featured in a video on the Princeton School of Engineering and Applied Science homepage.
The Role of Mechanically-Induced Separator Creep in Lithium-ion Battery Capacity Fade
C. Peabody and C. B. Arnold, J. Pow. Sour. (2011) demonstrates for the first time that separator creep arising from mechanical stresses can cause a significant loss of capacity in lithium-ion batteries over time. Compression testing of commercial Li+ batteries and separator assemblies followed by electrochemical and material characterization shows that creep-induced pore closure in the separator causes a reduction in conductivity, and essentially, a loss in capacity. | Full text | View at publisher
All Mechanical properties and electrochemical performance publications
- J. Cannarella and C. B. Arnold, “Ion transport restriction in mechanically strained separator membranes,” J. Power Sources, 226, 149-155 (2013) | Full text | View at publisher
- C. Peabody, and C. B. Arnold, "The Role of Mechanically-Induced Separator Creep in Lithium-ion Battery Capacity Fade” J. Pow. Sour. (2011), 196, 8147– 8153 (2011) | Full text | View at publisher