(595h) Poly(ionic liquid) Pentablock Terpolymer Electrolytes in Solid-State Lithium Ion Batteries

New solid polymer electrolytes (SPEs) that comprehensively possess the preferred properties of high ion conductivity, high electrochemical stability, robust mechanical properties, flexibility, and good film forming properties, can improve the safety and overall charge capacity and lifetime of lithium ion batteries. Although diblock copolymers have been explored as SPEs and can potentially provide the orthogonal properties of high ion conduction and high mechanical strength simultaneously in a solid-state material, there are limitations to lithium ion conducting diblock copolymers, such as a limited set of morphologies, and a lack of means to achieve simultaneous combination of more than two properties (e.g., conductivity, strength, flexibility). Compared to diblock copolymers, multiblock polymers involve more than two polymer chemistries and therefore enable the possibility to conjoin many of the desired properties all into a single platform. In our previous work, a lithium ion conducting poly(ionic liquid) pentablock terpolymer was explored as an SPE in lithium ion batteries and showed promising room temperature battery performance (charge-discharge cycles).In this study, a fundamental understanding of the relationship between electrochemical/chemical/mechanical properties and battery performance was investigated. A combination of in situ and ex situ experiments, such as battery performance, electrochemical impedance, stripping and platting, infrared spectroscopy, electron microscopy, x-ray photoelectron spectroscopy, and dynamic mechanical analysis, were conducted and will be presented.