Flexible and Facile Li-ion Conductive Composite Polymer Electrolytes using Self-assembled Poly(arylene ether sulfone)-g-Poly(ethylene glycol) and Poly(ethylene glycol)-functionalized Polysilsequioxane for Advanced Lithium Secondary Batteries
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A flexible composite polymer electrolyte (CPE) with high lithium (Li) transport capability was fabricated using a self-assembled polymeric matrix of poly(arylene ether sulfone) (PAES)-g-poly(ethylene glycol) (PEG) and polysilsesquioxane functionalized with poly(ethylene glycol) (POSS-PEG) nanoparticles. The tailored CPE possessed facile Li-transporting pathways created from phase-separation. Additionally, single Li-ion migration was facilitated by high Li-selectivity of POSS-PEG and the aid of succinonitrile with high dielectric constant. Therefore, the CPE exhibited superior ion conductivity (2.78 mS cm-1) and high Li-transference number (0.687). Also, the flexible CPE showed high mechanical strength (3.98 MPa) and inflammability due to the presence of reinforced PAES domains and POSS-PEG. These advantages make the proposed CPE very promising for advanced secondary Li-based batteries.