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作 者:尹艳红[1] 杨金鑫[1] 杨伟光[1] 岳红云[1] 王辉[1] 杨书廷[1]
机构地区:[1]河南师范大学化学与环境科学学院
出 处:《应用化学》2006年第11期1237-1242,共6页Chinese Journal of Applied Chemistry
基 金:河南省重大科技攻关(0522020300)资助项目
摘 要:以环氧化天然橡胶(ENR)和丁苯橡胶(SBR)为基质材料,利用相转换法制备了一种新型聚合物膜,热重(TG)分析结果表明,其具有良好的热稳定性,分解温度达300℃以上。用扫描电子显微镜(SEM)和原子力显微镜(AFM)研究了聚合物膜的表面特性。把该膜在浓度为1 mol/L的L iC lO4/(V(PC)∶V(EC)=1∶1)的电解质溶液中浸渍后制得了凝胶型聚合物电解质膜(GPE)。由不同环氧值(20%、40%和60%)的ENR在V(ENR)∶V(SBR)=1∶1时制得的聚合物电解质膜机械强度分别为184、397和243 kg/cm2。同时利用交流阻抗、线性扫描伏安等方法,对凝胶型聚合物电解质膜的电化学特性进行了系统的研究。结果表明,当m(ENR-40)∶m(SBR)=40∶60时所制备的聚合物电解质性能最为优良,室温下电导率和电化学稳定窗口分别达到了1.9×10-3S/cm和4.7 V,同时和金属锂电极之间具有良好的界面性能。Novel polymer films comprising of epoxidized natural rubber(ENR) and styrene butadiene rubber (SBR) were prepared by means of phase-inversion. Thermogravimetric (TG) analysis indicated that the polymer films possessed good thermal stability with a decomposition temperature higher than 300 ℃. Scanning electron microscopy(SEM) and atomic force microscopy(AFM) techniques were used to evaluate the microstructure. Gel polymer electrolytes (GPEs) were prepared by dipping ENR/SBR based polymer films in 1 mol/L LiClO4/(propylene carbonate ( PC ) )/( ethylene carbonate ( EC ) ) liquid electrolyte solutions with V(PC) : V(EC) being 1 : 1. Mechanical strength of the GPEs with V(ENR):V(SBR) being 1 : 1 and ENR at different epoxidized numbers (20% , 40% and 60% ) reach 184, 397, and 243 kg/cm^2, respectively. Electrochemical properties were investigated systematically v/a AC impedance and Liner Sweep Voltammetry (LSV). The results show that GPE prepared with 40% ENR had the highest conductivity of 1.9 - 10^-3 S/cm and a broad electrochemical stability window of 4.7 V at room temperature. Additionally, excellent interfacial stability between GPE and lithium electrode was obtained.
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