<em>p</em>-Phenylenediamine-Bridged Binder-Electrolyte-Unified Supramolecules for Versatile Lithium Secondary Batteries
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The binder is an essential component in determining the structural integrity and ionic conductivity of Li-ion battery electrodes. In this presentation, we propose a novel system for a Li secondary battery that combines the electrolyte and binder into a unified structure, which is achieved by employing para-phenylenediamine (pPD) moiety to create supramolecular bridges between the parent binders. Due to a partial crosslinking effect and charge-transferring structure of pPD, the proposed strategy improves both the ionic conductivity and mechanical properties by a factor of 6.4 (achieving a conductivity of 3.73 x 10-4 S cm-1 for PEO-pPD) and 4.4 (reaching a mechanical strength of 151.4 kPa for PAA-pPD) compared to those of conventional parent binders. As a result, when the supramolecules of pPD are used as a binder in a pouch cell with a lean electrolyte loading of 2 μl mAh-1, a capacity retention of 80.2% is achieved even after 300 cycles.