Abstract
AbstractCovalently‐bonded poly(vinyl alcohol)‐silica (PVA‐SiO2) composite nanofiber membranes are fabricated via sol‐gel electrospinning and their physical and electrochemical properties are investigated for application as separators in lithium‐ion batteries (LIBs). Experimental results demonstrate the PVA‐SiO2 membranes possess a unique three‐dimensional interconnected porous structure and display higher porosity (73%), better electrolyte affinity, higher electrolyte uptake (405%) and lower thermal shrinkage compared to commercial polypropylene (PP) membranes. In addition, batteries using PVA‐SiO2 composite nanofiber membranes as separators exhibit enhanced ionic conductivity (1.81 mS cm−1), superior cycling stability and C‐rate performance than those using PP separators. These findings reveal that the PVA‐SiO2 composite nanofiber membrane might be a promising alternative to commercial polyolefin separator for high performance LIBs.
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