Solid electrolytes are a promising solution for improving energy density and safety of lithium ion batteries. Among the different types of solid electrolytes, ceramic-polymer composite electrolytes (CPEs) are attractive because they combine the processability and flexibility of polymers with the high ionic conductivity and mechanical modulus of ceramics. However, the interface between polymer and ceramic electrolytes must be optimized to achieve synergy. Herein, we report the effect of surface functionalization of the ceramic particles on the ion transport and mechanical properties of CPEs. The ceramic particles used in this work are doped lithium aluminum titanium phosphate (LICGC<sup>TM</sup>), with native hydroxyl groups on the surface. The surface was functionalized and grafted with short poly(ethylene oxide) (PEO) chains. Our rheological and thermal studies indicate that CPEs consisting of PEO-based polymer electrolyte and PEO-modified ceramic particles exhibit higher modulus and lower degree of crystallinity, compared to CPEs containing unmodified ceramic particles. The ionic conductivity of CPE with modified and unmodified ceramic particles is also compared. The surface grafting method provides additional means to control polymer-ceramic interfacial interactions and can be beneficial in optimizing ion transport and mechanical properties of CPEs.

Surface-functionalized LICGC ceramic particles as ceramic-polymer composite solid electrolyte

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.