碳纳米管超电容器组装工艺的初步探讨

Introduction of new techniques for installation of carbon nano-tubes super capacitor

通过催化裂解法制备了碳纳米管并采用超声震荡的方法制备成板式碳纳米管电极。碳纳米管材料比容量为39F·g-1,并表现出良好的功率特性。阻抗测试表明球磨处理可以较明显地降低碳纳米管材料的电阻。采用多种研究方法对基于该种材料的超电容器的电化学特性进行了详细研究,并采用"Transmissionlinemodel"模型对电极的多孔结构进行了模拟。还介绍了两种超电容器组装工艺并根据该工艺制备了Ⅰ型和Ⅱ型碳纳米管超电容器,两种超电容器都采用单体内部串联式结构且工作电压都达到了10V,测试表明采用不锈钢导电体的Ⅱ型碳纳米管超电容器比采用导电橡胶导电体的Ⅰ型电容器更适合高功率放电,而后者比较适合制成小型电容器作为电子设备的备用电源使用。

Carbon nano-tubes prepared by catalytic pyrolysis method were considered as active electrode materials for the storage of energy in super capacitors. Due to their unique meso-porosity, this material has a high ability for the accumulation of charges in the electrode/electrolyte interface. Electrode based on carbon nano-tubes was developed by ultrasonic vibration. The value of capacitance obtained from nano-tubes reaches 39 F·g-1. Different techniques were applied to investigate the electrochemical performance of carbon nano-tubes super capacitor. 'Transmission line mode' were used to describe the porous structure of nano-tubes electrodes. Type I and type Ⅱ super capacitor with structure of 'internal series' were assembled. The working voltage over 10 V was obtained for both ones. The power performance of type Ⅱ super capacitor with stainless steel plate as conductor is superior to that of type I super capacitor with conductive rubber conductor. The later can be used as the back up power for electronic instrument. Characteristics of capacitance and power for both types of super capacitors were described in detail.