Presentation Information
[23p-P05-41]Enhanced performance of polymeric solid-stateelectrolytes modified by multifunctional polymer
〇(D)Jiaying Zhang1, Yue Zhao2, Tingli Ma1 (1.Kyushu Inst. Tech., 2.China Jiliang Univ.)
Keywords:
Solid polymer electrolyte
Solid polymer electrolytes (SPEs) emerge as promising candidates due to their exceptional processability and favorable interfacial compatibility for achieving solid-state batteries. However, the low ionic conductivity and inadequate mechanical properties in suppressing the growth of lithium (Li) dendrite limit the practicalapplication. Various attempts have been made to boost the conductivity of SPEs, like polymer blending or the addition of nanofillers. In this study, a multifunctionalpolymer (MP) characterized by high ionic conductivity, enhanced mechanical properties, and reversible self-healing ability was introduced into SPEs. Two SPEs of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and poly(ethylene oxide) (PEO), with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as the Li salt, were chosen to create composite SPEs. The positive impact of MP in the composite SPEs was confirmed, showcasing enhanced ionic conductivity and Li-ion migration coefficients, which can be attributed to the reduced crystallinity modified by MP and the highly efficient ion-conducting channels. Furthermore, the composite SPEs exhibited superior adaptability to Li metal interfaces and enhanced mechanical properties toeffectively mitigate the growth of Li dendrites. This work unveils a universally applicable strategy for enhancing SPEs by introducing polymers derived from functionally diverse monomers, thereby comprehensively boosting the performance of composite SPEs for solid-state Li-metal batteries.