Overcoming the temperature limitation of lithium-ion batteries: Local dynamics in supported ionic liquid–polymer electrolytes
Year: 2026
Type: article
Abstract: Lithium-ion batteries designed for operation under harsh conditions require electrolytes that mitigate the volatility, flammability, and thermal instability of organic electrolytes. In this work, we study a high-temperature supported polymer electrolyte based on the tetrabutylphosphonium (trifluoromethylnonafluorobutylsulfonyl) imide (P4444IM14) ionic liquid with the LiTFSI salt, confined within polyacrylonitrile (PAN) membrane. Ion dynamics were studied using multinuclear NMR, combining diffusion and FFC-NMR on 1H, 19F, and 7Li, complemented by solid-state 13C NMR of the PAN host. PFG-NMR shows that LiTFSI reduces ionic self-diffusion in the liquid electrolyte, while incorporation into the PAN membrane does not further limit diffusion. Consistently, NMRD profiles remain essentially unchanged upon confinement with the polymer membrane, with no evidence of additional relaxation mechanisms associated with confinement, indicating weak dynamic coupling at the polymer–electrolyte interface. Thermal and electrochemical properties were also investigated confirming minimal influence of the PAN on electrolyte performance. Graphical Abstract
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,490
Funders: U.S. Department of Energy, National Aeronautics and Space Administration, City University of New York, University of Notre Dame, Universidade Federal de Viçosa, Lazio Innova, European Commission, Fundação de Amparo à Pesquisa do Estado de São Paulo, Universidade de São Paulo, National Institutes of Health, Office of Science, Basic Energy Sciences, Energy Frontier Research Centers
OpenAlex ID: W7171415566