Enhancing cycling performance of all-solid-state lithium batteries using Li6.4La3.0Zr2.0Al0.2O12-reinforced hybrid solid electrolyte

Abstract

All-solid-state lithium batteries (ASSLBs) utilizing solid electrolytes are regarded as highly promising candidates for next-generation batteries due to their high energy density and enhanced safety. However, technical challenges such as low ionic conductivity and interfacial issues of solid electrolytes currently restrict the practical applications of ASSLBs. In this study, solid hybrid electrolytes are developed by incorporating a polymer electrolyte composed of poly(vinylidene fluoride-co-hexafluoropropylene), poly(epsilon-caprolactone), 1-propyl-1-methyl-pyrrolidinium bis(trifluoromethylsulfonyl)imide, and lithium bis (trifluoromethanesulfonyl)imide into a fibrous Li6.4La3.0Zr2.0Al0.2O12 (LLZAO) membrane. The incorporation of an ion-conductive fibrous LLZAO membrane with the polymer electrolyte significantly enhances mechanical robustness and achieves a high ionic conductivity. The Li/LiNi0.78Co0.10Mn0.12O2 cell employing this solid hybrid electrolyte delivers a high discharge capacity of 198.3 mAh g(-1) at 0.1C and 55 degrees C, exhibits an excellent cycling retention of 89.0 % at 400th cycle at 0.5C and 55 degrees C. Our results highlight the potential of LLZAO-based hybrid electrolytes in achieving high safety standards and extended cycle life, making them highly suitable for practical ASSLB applications.