<span style="color: windowtext;">Research on the Preparation of Supercapacitor Separators with High Wettability and Excellent Temperature Adaptability through In Situ Deposition of Nano-Barium Sulfate on Regenerated Cellulose
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With portable electronics and new-energy vehicles booming, the demand for high-performance energy storage devices has skyrocketed. Supercapacitor separators are thus vital. Traditional ones such as polyolefins and non-woven fabrics have limitations, while cellulose and its derivatives, with low cost, good hydrophilicity, and strong chemical stability, are potential alternatives. This study used regenerated cellulose Lyocell fibers. Through fiber treatment, refining, and in situ deposition, a composite regenerated cellulose separator (NFRC-Ba) with nano-barium sulfate was made. Its physical, ionic, and charge–discharge properties were tested. The results show that NFRC-Ba excels in terms of mechanical strength, porosity, hydrophilicity, and thermal stability. Compared with the commercial NKK30AC-100 separator, it has better ionic conductivity, better ion-transport ability, a higher specific capacitance, better capacitance retention, and good cycle durability. It also performs stably from -40°C to 100°C. With a simple and low-cost preparation process, NFRC-Ba could be a commercial separator for advanced supercapacitors.