碱性固态聚合物电解质PVA-TiO_2-KOH-H_2O的制备及应用

Preparation of Alkaline Solid Polymer Electrolyte Based on PVA-TiO_2-KOH-H_2O and Tts Application in Zn-Ni Battery

通过溶胶凝胶法制备一种新型的合成物,它基于PVA高分子基质,TiO2陶瓷填料,KOH和水。通过SEM来研究这种高分子薄膜,结果显示TiO2微粒散布到PVA基质中会形成一些只有几微米的TiO2聚合物。通过对含水率和TiO2添加量对隔膜性质的研究,得到室温下这种薄膜的离子电导率值为0.14 S/cm。组装的锌镍电池充电电压最高可达4.2 V,放电电压可到0.1 V,且十分稳定。使用这种电解质的锌镍二次电池在低充电放电率条件下电化学性能优越。

PVA-TiO2-KOH-H2O alkaline solid polymer electrolyte separator is successfully prepared by the solution casting method. The properties of PVA-TiO2-KOH alkaline polymer electrolyte films were studied by scanning electron microscopy （SEM）. The result showed that TiO2 particles dispersed into the PVA matrix although some TiO2 aggregates of several micrometers were formed. According to the research of the influence of water ratio and the amount of TiO2, it is found that the room temperature （20 ℃ ） ionic conductivity values of typical samples were 0.14 S/cm. The Zn-Ni secondary battery with the alkaline polymer electrolyte PVA-TiO2- KOH had a charging voltage of 4.2 V and a stable discharging voltage of 0.1 V. The Zn-Ni secondary battery with the alkaline polymer electrolyte PVA-TiO2-KOH had excellent electrochemical property at the low chargedischarge rate.