Lithium Perborate-Based Composite Polymer Electrolytes for All-Solid-State Lithium-Ion Batteries: Performance Enhancement and Stability

Abstract A rapid rise in the development of portable electronic devices and telecommunication technologies has led to an ever-growing demand for high safety, large energy density and cost effective systems for storing energy. Rechargeable all-solid-state lithium-ion batteries are extremely productive without compromising performance. In this study, Garnet-type Li₇La₃Zr₂O₁₂ (LLZO), filler was prepared employing the sol-gel method. That follows, the high-performance poly(ethylene oxide)/ Lithium perborate (LiBO₃)/LLZO composite solid polymer electrolyte was fabricated using a simple solution-casting technique. The morphology and composition of the prepared CSPE (composite solid polymer electrolyte) (PEO-LiBO₃-LLZO) were investigated using X-ray diffraction and scanning electron microscopy in addition to other physicochemical characterization techniques. The composite solid polymer electrolyte exhibits a maximum ionic conductivity of 2.4 x 10⁻ ⁴ S cm⁻ ¹ with LLZO filler and a wide electrochemical window of 4.6 V vs. Li⁺/Li. The prepared electrolyte reveal good electrochemical efficiencies with elevated discharge capacity of 73.2 mAhg⁻ ¹ and excellent faradaic efficiency of 98% since 100 cycles. Based on these results, the prepared composite solid polymer electrolyte furnish an auspicious methodology for the advancement of high-performing rechargeable all-solid-state lithium-ion batteries.