不同来源胶体蓄电池用气相SiO2的比较

采用X射线衍射光谱法(XRD)、红外光谱、粘度实验和交流阻抗等方法对国产和德国进口气相SiO2进行了研究,结果表明胶体蓄电池电解质选用比表面为200 m2/g的气相SiO2优于300 m2/g的,SiO2含量最好小于15%(质量分数),其中含量为6%时较8%佳,在3 600 r/min下合适的分散时间为1～1.5 h左右.国产和进口的SiO2硅羟基类型、颗粒的晶型基本相同.相同型号的气相SiO2,进口比国产的表面活性更高、凝胶能力更强,在不加添加剂的情况下配制的胶体电解质,其强度和电导率更高,但电荷转移电阻比国产的更大.

Comparison of fumed silica for gel battery with different source

The properties of fumed silica made in China and German were studied by XRD,IR spectra,viscosity and EIS measurement.The results indicate that the fumed silica with surface area of 200 m2/g has superior performance than that of 300 m2/g in gel battery. The concentration of fumed silica should be controlled less than 15% and the optimum concentration is 6%, the optimum dispersing time is one hour at 3 600 r/min. The fumed silica made in China and German possessed have the same crystal structure. The fumed silica from Germany showed better gelling ability and higher surface active, so the gelled-electrolyte showed higher gelling intensity and conductivity, but higher charge-transfer resistance.