酸催化溶胶凝胶法制备细菌纤维素/SiO_2复合隔膜

Study on bacterial cellulose/SiO_2 composite separator prepared by sol-gel method using acid as catalyst

在细菌纤维素水凝胶中,用酸催化正硅酸乙酯水解,原位生成纳米级Si O2粒子,压缩干燥后,得到细菌纤维素(bacterial cellulose,BC)/Si O2复合隔膜,并对该复合膜的微观形貌、热稳定性以及电化学性能等进行了测试和分析。热重分析(TGA)及热收缩测试表明该BC/Si O2复合膜在200℃以下具有较好的热稳定性(零收缩);BC/Si O2复合膜的锂离子电导率在常温下(25℃)可以达到2.10×10-4 S/cm;此外,BC/Si O2复合膜在Li/Li Fe PO4半电池中表现出很好的化学和电化学稳定性。所制备的BC/Si O2复合膜有望在锂离子电池中得到应用。

Bacterial cellulose （BC）/SiO2 composite membrane were prepared by sol-gel method using acid as the hydrolysis catalyst of tetraethyl orthosilicate （TEOS）. The typical properties of BC/SiO2 composite membranes were studied in terms of ionic conductivity, thermal stability and electrochemical performance. The results show that the composite membrane is thermally stable up to 200 ℃ without any shrinkage. The room temperature （25 ℃） ionic conductivity was 2.10 × 10^-4 S cm^-1. The BC/SiO2 composite membrane was also electrochemically compatible with the working electrode. The composite membrane was expected to be applied in the lithium-ion battery.