A collagen-based electrolyte-locked separator enables capacitor to have high safety and ionic conduc

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The conventional liquid electrolytes (LEs) have a high level of ionic conductivity;however,they often suffer from the poor processability and safety risks of potential leakage.Although solid-state electrolytes (SSEs) can solve these inherent problems of LEs,the ionic conductivity of most SSEs is several magnitudes lower than these of LEs.Herein,we report a novel strategy by building liquid ion-transport channels in a solid framework and prepared an electrolyte-locked separator (ELS) using a collagen fiber membrane (CFm).The liquid electrolyte was primarily infiltrated in the smaller voids of CFm,and its ionic conductivity could attain to 9.0 × 10-3 S cm-1 when the electrolyte absorption (EA) reached up to 112.0%.After centrifuging treatment,the electrolyte retentions (ER) and ionic conductivities of ELS were 108.93% and 8.37 × 10-3 S cm-1,respectively,which were much higher than those of commercial cellulose separator (CS),exerting excellent liquid-locking performances.In particular,the electrical double-layer capacitors (EDLC) assembled by ELS or CS were characterized and exhibited similar electrochemical performance,demonstrating the satisfactory ability and applicability of ELS for commercial use.In addition,the ELS-based EDLC exhibited favorable flexibility with relative lower loss of capacitance under different angles of bending.
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