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Multiple Hydrogen Bond Channel Structural Electrolyte for an Enhanced Carbon Fiber Composite Battery

journal contribution
posted on 2022-02-28, 00:00 authored by Jaehoon Choi, Omid ZabihiOmid Zabihi, Russell VarleyRussell Varley, Jane Zhang, B L Fox, Minoo NaebeMinoo Naebe
Structural batteries made of carbon fiber composites have been receiving great attention for automotive application in the last decade. However, a structural battery electrolyte (SBE) for the structural batteries is conventionally dependent on utilizing highly volatile carbonate-derivative liquid electrolytes to provide moderate ionic conduction. This study introduces a SBE which fabricates as a two-phase system via reaction-induced phase transition as well as includes a hybridized electrolyte, consisting of a low flammability electrolyte with a solid additive-inducing multihydrogen bond. The proposed SBE is composed of a vinyl ester polymer containing triethylene glycol dimethyl ether (TriG) and cyclohexanedimethanol (CHDM) as a quasi-solid additive. Confirmed by Fourier transform infrared, Raman, and 7Li-nuclear magnetic resonance results, the contents of CHDM in the SBE structure play a crucial role not only through the plasticizing effect but also through the formation of a multidimension channel via a hydrogen bond, thereby contributing to enhancing the motion of the cation in the SBE. The optimized SBE (Li-TriG-CHDM10) shows an ionic conductivity of 2.0 × 10-4 S cm-1 with an E′ of ∼300 MPa at ambient temperature. To exhibit the possibility for a structural battery, the carbon fiber composite lamina was fabricated using an optimized SBE and evaluated as a battery half-cell, showing the potential of a high bearing mechanical load and ion transport between the carbon fibers and the electrolytes.



ACS Applied Energy Materials






2054 - 2066



Publication classification

C1 Refereed article in a scholarly journal