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

  • On the coupling between stress and voltage in lithium-ion pouch cells

    J. Cannarella, C. Z. Leng, and C. B. Arnold, Proc. SPIE (2014) investigates the thermodynamic relationship between applied mechanical stress and the open circuit voltage of lithium-ion pouch cells. The results suggest that materials exhibiting intercalation-induced expansion can be used as a new class of force sensors. | Full text | View at publisher

  • State of health and charge measurements in lithium-ion batteries using mechanical stress

    J. Cannarella and C. B. Arnold, J. Power Sources (2013) demonstrates a novel technique for measuring SOH and SOC of lithium-ion cells using measurements of mechanical stress or expansion. The simplicity and straightforwardness of this method are a significant advantage to the more complex conventional cell monitoring techniques.| Full text | View at publisher

  • 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

    1. J. Cannarella, C. Z. Leng, and C. B. Arnold, "On the coupling between stress and voltage in lithium-ion pouch cells," Proc. SPIE, 9115 (2014) | Full text | View at publisher
    2. J. Cannarella and C. B. Arnold, "State of health and charge measurements in lithium-ion batteries using mechanical stress," J. Power Sources, 269, 7-14 (2014) | Full text | View at publisher
    3. J. Cannarella and C. B. Arnold, "Stress evolution and capacity fade in constrained lithium-ion pouch cells," J. Power Sources, 246, 745-751 (2014) | Full text | View at publisher
    4. 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
    5. 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