Composite alkaline polymer electrolytes and its application to nickel-metal hydride batteries
Composite alkaline polymer electrolytes and its application to nickel-metal hydride batteries
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DOI：
10.1016/j.electacta.2005.07.027
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发表时间：
2006-02
影响因子：
6.6
通讯作者：
Anbao Yuan;Jun Zhao
中科院分区：
文献类型：
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作者：
Anbao Yuan;Jun Zhao
为了提高聚氧化乙烯（PEO）-KOH基碱性聚合物电解质的离子电导率，在PEO-KOH复合物中分别加入TiO 2、β-Al 2 O3和SiO2，制备了相应的复合碱性聚合物电解质。实验结果表明，所制备的聚合物电解质在室温下具有较高的离子电导率，交流阻抗法测得的电导率为10 - 3S cm-1，且具有良好的电化学稳定性。钙的电化学稳定窗口。用不锈钢封闭电极循环伏安法测定1.6V。研究了KOH、H2O和纳米添加剂等组成对膜离子电导率的影响。电导率的温度依赖性也被确定。采用溶剂浇铸法制备了聚乙烯醇（PVA）-羧甲基纤维素钠（CMC）-KOH碱性聚合物电解质。采用交流阻抗法、循环伏安法和差热分析法对聚合物电解质的性能进行了表征。制备的PVA-CMC-KOH-H2O电解质的离子电导率可达10 - 2Scm-1数量级。同时也解释了CMC的加入对碱性聚合物电解质性能的影响。实验结果表明，PVA-CMC-KOH-H2O聚合物电解质可用于MH/Ni电池。
In order to enhance the ionic conductivity of polyethylene oxide (PEO)-KOH based alkaline polymer electrolytes, three types of nano-powders, i.e., TiO2, β-Al2O3and SiO2were added to PEO-KOH complex, respectively, and the corresponding composite alkaline polymer electrolytes were prepared. The experimental results showed that the prepared polymer electrolytes exhibited higher ionic conductivities at room temperature, typically 10−3S cm−1as measured by ac impedance method, and good electrochemical stability. The electrochemical stability window of ca. 1.6V was determined by cyclic voltammetry with stainless steel blocking electrodes. The influence of the film composition such as KOH, H2O and nano-additives on ion conductivity was investigated and explained. The temperature dependence of conductivity was also determined. In addition, polyvinyl alcohol (PVA)-sodium carboxymethyl cellulose (CMC)-KOH alkaline polymer electrolytes were obtained using solvent casting method. The properties of the polymer electrolytes were characterized by ac impedance, cyclic voltammetry and differential thermal analysis methods. The ionic conductivity of the prepared PVA-CMC-KOH-H2O electrolytes can reach the order of 10−2Scm−1. The effect of CMC addition on the alkaline polymer electrolytes was also explained. The experimental results demonstrated that the PVA-CMC-KOH-H2O polymer electrolyte could be used in Ni/MH battery.