ArticleACS macro letters2026
Salt-Induced Nanoparticle Aggregation Decouples Mechanical Reinforcement and Ionic Transport in Polymer Nanocomposite Electrolytes.
Article in ACS macro letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report a salt-responsive strategy for mechanically reinforcing polymer nanocomposite (PNC) electrolytes while retaining ionic conductivity (σdc) of neat polymers. In poly(ethylene glycol) (PEG) electrolytes containing negatively charged silica nanoparticles, dissociated Li+ or Na+ cations screen the silica surfaces and induce particle aggregation. Polymer-ion-silica interactions convert the resulting aggregates into stress-bearing structures, increasing the shear modulus by up to 106-fold depending on PEG molecular weight and particle size. In contrast, σdc remains comparatively insensitive to silica incorporation. Temperature-dependent σdc is instead strongly influenced by PEG-salt crystallization and segmental relaxation, indicating strong coupling to polymer dynamics. Vogel-Tammann-Fulcher analysis yields pseudo-activation energies of approximately 10-11 kJ/mol, while the Vogel temperature varies more strongly with PEG molecular weight and cation chemistry than with silica incorporation. These results identify salt-induced particle organization as a practical route to decouple mechanical reinforcement from ionic transport in PNC electrolytes.
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