Non-Uniformity Behaviors of Commercial Large-Format Batteries: Performance and Durability
Both in-situ and ex-situ techniques utilizing synchrotron X-ray diffraction and Neutron diffraction are being developed at Argonne National Laboratory and Oak Ridge National Laboratory, respectively. Under various operating conditions, 3-D profiles of temperature, internal stress, and electrode SOC% can be collected on large-format Li-ion based prismatic cells. Both techniques, complementary to each other, will be briefly described. We will focus on discussing non-uniformity behaviors of local battery performance and changes of local material structure and chemistry before and after storage tests and charge-discharge cycles. These results will be correlated to the diffraction data, to understand the effects of non-uniform profiles of temperature, internal stress, and electrode SOC% on battery life-time durability. Important implications on battery quality, safety, and controls will also be mentioned.
This project is partially funded by US-CHINA Clean Energy Research Center (CERC)-Clean Vehicles Consortium.