Critical role of polymer-ceramic ion exchange for high conductivity composite electrolytes

Bhattacharya, Amit; Ock, Ji-young; Wang, Tao; Bamford, James T.; Segalman, Rachel A.; Dai, Sheng; Sokolov, Alexei P.; Chen, Xi Chelsea; Clément, Raphaële J.

doi:10.1016/j.ssi.2025.116938

Critical role of polymer-ceramic ion exchange for high conductivity composite electrolytes

Journal Article · Wed Jun 25 00:00:00 EDT 2025 · Solid State Ionics

DOI:https://doi.org/10.1016/j.ssi.2025.116938· OSTI ID:2584496

^[1]; ^[2]; ^[2]; Bamford, James T. ^[1]; ^[1]; ^[2]; ^[2]; ^[2]; Clément, Raphaële J. ^[1]

Univ. of California, Santa Barbara, CA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Polymer-ceramic composites offer a path to enhance the transport and mechanical properties of solid electrolytes. However, an in-depth understanding of the extent and role of ion transport along and across polymer-ceramic interfaces in these systems is lacking. We have recently shown that Li-conducting Li_0.11Na_0.24K_0.02La_0.43TiO_2.82 (LMTO) nanorods can be prepared by a molten flux method, and the addition of 30–50 weight (wt.)% LMTO to a bis[(trifluoromethyl)sulfonyl]imide-vinyl ethylene carbonate-based single-ion conducting (SIC) polymer electrolyte leads to a two-fold enhancement in Li-ion conductivity, from 1.4 to 3.0 × 10⁻⁵ S/cm at 30 °C. In the present study, we use NMR methods to identify the Li-ion transport pathways and determine the timescale of chemical exchange between the SIC polymer and LMTO ceramic components. Tracer exchange NMR indicates preferential transport through the polymer or polymer-interfacial regions, and exchange spectroscopy (EXSY) and a new isotope exchange method reveal negligible Li exchange between the SIC polymer and LMTO ceramic up to several days. Here, LMTO nanorods act as a passive filler. Our results further highlight that significant (e.g., 10- or 100-fold) conductivity enhancements in composite electrolytes can only be achieved 1) with ionically-conductive fillers, and 2) when both the ceramic and polymer components actively participate in long-range transport. For this, fast interfacial ion exchange is needed. In conclusion, this leads us to introduce a critical interfacial ion exchange time to evaluate whether a filler actively contributes to conduction in a composite electrolyte, and screen for promising polymer-ceramic pairings to accelerate the development of high conductivity solid electrolytes.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2584496

Journal Information:: Solid State Ionics, Journal Name: Solid State Ionics Vol. 428; ISSN 0167-2738

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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