纤维素基离子凝胶聚合物电解质的制备与性能

Preparation and Properties of In Situ Crosslinking Cellulose-Based Ionogels

通过原位交联木浆纤维素/1-乙基-3-甲基咪唑醋酸盐溶液制备了纤维素基离子凝胶聚合物电解质,并采用扫描电子显微镜(SEM)、流变、力学拉伸及交流阻抗等测试,研究了纤维素基离子凝胶的形貌﹑力学性能和电化学性能。SEM结果表明,所得交联型离子凝胶具有纳米多孔网状结构。流变结果表明高温下离子凝胶具有很好的弹性,200℃时的弹性模量为1.7×105 Pa。电学性能测试结果表明室温下离子凝胶具有很高电导率,达到6.3×10-3 S/cm,且电导率随温度的升高而增大。力学性能测试结果显示离子凝胶具有良好的力学强度,其拉伸强度达9.6 MPa。

Cellulose-based ionogels were successfully prepared from the wood pulp cellulose/1-ethyl-3- methylimidazole acetate solution by in situ crosslinking, and their morphology, mechanical, electrochemical properties were investigated via scanning electron microscope （SEM）, rheology, tensile tests, and AC impedance. The SEM results indicate that the obtained crosslinked cellulose-based ionogels have nanoporous mesh architecture, which can？ absorb large amounts of ionic liquid. The theological results suggest that the storage modulus of the ionogels can reach 106 Pa at 25 ℃ and 1.7 × 10^5 Pa at 200 ℃. Furthermore, the ionogels have good mechanical properties, the tensile strength can reach 9.6 MPa and the elongation at break is 170.2 % for 7 %-ionogels. The ionic conductivity of the ionogels at ambient temperature is 6.3 × 10- 3 S/era and it increases with increasing temperature. The above results demonstrate that this novel ionogels are promising for application as gel polymer electrolytes （GPE） in electrochemical area.