镍氢电池用PVA-TiO_2聚合物电解质膜

PVA-TiO_2 alkaline polymer electrolyte membrane for MH / Ni battery

通过钛酸四丁酯的原位水解制备聚乙烯醇（PVA）-TiO2碱性聚合物电解质膜，用傅里叶变换红外光谱（FT-IR）、SEM、交流阻抗和循环伏安法分析电解质膜的结构与电化学性能。在室温条件下，PVA-6％TiO2聚合物电解质的碱吸率和电导率最高，分别为105％和0．023S／cm，电化学稳定窗口为-1．0～1．0V；将PVA-TiO2碱性电解质膜组装成以Mg3MnNi2储氢合金为负极材料的聚合物镍氢（MH／Ni）电池，以15mA／g在0．4～1．5V循环12次，放电比容量稳定在150mAh／g左右。

Poly （vinyl alcohol） （PVA）-TiO2 alkaline polymer electrolyte membranes were prepared through in-situ hydrolysis synthesis based on tetrabutyl titanate. The structure and electrochemical properties of the membrane was characterized by Fourier transform infrared spectroscopy（ FT-IR）, SEM, A. C. impedance and cyclic voltammetry techniques. The PVA-6% TiO2 electrolyte membrane exhibited the maximum alkaline uptake of 105% and the highest hydroxyl ionic conductivity value of 0. 023 S/cm at room temperature,the electrochemical stability window was - 1.0 - 1.0 V. Polymer MH/Ni battery was assembled by using the PVA- TiO2-KOH polymer membrane as electrolyte,Mg3MnNi2 hydrogen storage alloy as negative electrode. After 12 cycles（0. 4 ~ 1.5 V, 15 mA/g） ,the specific discharge capacity was stable around 150 mAh/g.