The mechanisms for enabling semi-solid interface of lithium ion battery by sticky separators

X. Su, W. Zuo, Z. Le, Z. Ma, A. Millonig, A. Parmar, E. Jackson, X. Wang, Z. Yu, J. Jeon, J. Wang, D. Johnson
United States

Keywords: sticky separator, interface, lithium ion battery, semi-solid


The interfaces in lithium ion batteries are always critical for their performance, mechanical strengths and safety requirements. Therefore, various sticky separators have been introduced to lithium ion batteries recently for improving their interfaces. The interfacial properties including the strengths, electrolyte wetting abilities and conductivities are determined by the adhesive layer of the sticky separator and the corresponding lamination conditions. However, the governing mechanisms for this remain unclear, which hinders the utilization of sticky separators in lithium batteries for improving their interfaces. Presented here is combining peeling test, Gurley/porosity test, Electrochemical Impedance Spectroscopy (EIS)/battery test, Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS) technologies together to demonstrate the detail mechanisms for sticky separators to improve interfaces of the lithium ion batteries, which will be valuable information for developing the semi-solid high energy density lithium ion batteries to meet fast growing vehicle electrification demand