电泳沉积法制备高能量密度的非对称平面微型超级电容器

首先采用光刻、蒸镀金的方法制备叉指电极,随后把合成的具有赝电容特性的二维Mn O2和Ti3C2纳米片分别电泳沉积到叉指电极上,构建了非对称平面超级电容器。其中Mn O2为正极,Ti3C2为负极,滴涂凝胶为电解质,并利用透明的聚二甲基硅氧烷薄膜封装成器件。通过能量色散X射线光谱(EDS)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、光学显微镜等手段证明了电泳沉积后材料的结构没有发生变化以及叉指电极的成功制备,也说明了电泳沉积后材料的形貌为薄膜结构。最后通过二电极系统测试了器件的电化学性能,结果显示该器件具有高倍率性能和高能量密度,同时保持着高功率密度和优异的机械柔韧性,其容量在各种弯曲角度下基本没有衰减。

Preparation of high-energy-density asymmetric planar microsupercapacitors by electrophoretic deposition

The interdigitated electrodes were first prepared by photolithography and gold evaporation.Subsequently,the synthesized two-dimensional MnO₂ and Ti3 C2 nanosheets with pseudocapacitive properties were electrodeposited onto the interdigitated electrodes to fabricate asymmetric planar supercapacitors with gel electrolyte encapsulated with a transparent polydimethylsiloxane film,where MnO₂ was the positive electrode and Ti₃C₂ was the negative electrode.The results of energy-dispersive X-ray spectroscopy,Fourier-transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),and optical microscopy proved that the microstructures of MnO₂ and Ti₃C₂ after electrophoretic deposition were unchanged and the interdigitated electrodes were prepared successfully,and also showed that the electrophoretically deposited materials were of a thin film structure.The electrochemical performance of the fabricated device was tested by a two-electrode system,which showed that it not only had high rate capability and high energy density,but also maintained high power density and good mechanical flexibility.There was basically no attenuation in capability for the device when being bended at various angles.