Boosting Ion Conduction and Stability through Filler Surface Modification in CSEs
발표자
서하림 (경북대학교)
연구책임자
유지영 (경북대학교)
초록
내용
Composite solid electrolytes (CSEs) hold significant potential for solid-state lithium batteries, yet the role of filler–polymer interfacial chemistry in ion transport remains insufficiently clarified. Here, this study presents a ternary CSE system comprising an ionic liquid, polymer, and LLZTO, with tailored surface properties via ultraviolet ozone (UVO) treatment, which reduces oxygen vacancies. EIS and DRT analysis showed that the modified electrolyte (LEP/UV) displayed higher ionic conductivity and lower interfacial resistance than the pristine electrolyte (LEP). Furthermore, XPS profiling and LIBS mapping demonstrated thinner, more uniform SEI layers on Li metal. Consequently, LEP/UV full cells retained 92.47% capacity after 300 cycles at 0.2 C, outperforming the untreated system. This work highlights surface engineering of ceramic fillers as an effective method for boosting interfacial ion transport and cycling stability in solid-state electrolytes.