玻纤基复合电解质隔膜的制备及性能

Preparation and performance of glass fiber based composite electrolyte separator

以玻璃纤维无纺布为基体,用高分散聚甲基丙烯酸甲酯（PMMA）包覆纳米Ti O2杂化材料（Ti O2@PMMA）进行复合,制备玻璃纤维基复合聚合物电解质膜。用SEM、热收缩、交流阻抗和充放电测试等研究复合膜的结构、热尺寸稳定性及电化学性能。玻璃纤维/Ti O2@PMMA纳米复合膜可在120-380℃保持良好的尺寸稳定性,活化后得到的复合聚合物电解质膜在室温下的离子电导率为2.88 m S/cm,与金属Li电极保持良好的界面稳定性。组装的Li Co O2/Li扣式电池在2.75-4.20 V充放电,8.0 C放电比容量可达120 m Ah/g,以不同电流共循环200次,放电容量保持率为85%。

Glass fiber based composite electrolyte separator was prepared with glass fiber nonwoven as supporting membrane which was modified by highly dispersed nano-TiO2 coated with polymethylmethacrylate （ PMMA ） hybrid （ TiO2 @ PMMA ）. The structure, thermal dimensional stability and electrochemical performance of the composite separator were studied by SEM, heat shrinking, AC impedance and charge-discharge tests. The glass fibers/TiO2 @ PMMA composite separator could maintain fine dimensional stability at 120 - 380℃. The composite polymer electrolyte separator after activating possessed a high ionic conductivity of about 2. 88 mS/ cm at room temperature, exhibited good interface stability with Li electrode. When charged-discharged in 2. 75 -4. 20 V, the specific discharge capacity of the assembled LiCoO2/Li coin cell could reach to 120 mAh/g at 8. 0 C,the discharge capacity retention ratio was 85% after 200 cycles with different currents.