Development of high specific energy all solid planar micro supercapacitors

The Zhongshuai Wu team of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences collaborated with Klaus Müllen of the German Max Planck Polymer Research Institute and Xinliang Feng of the Dresden University of Technology to develop a high-efficiency fluorine-doped graphene by electrochemical stripping method. Specific energy solid state planar micro supercapacitors. Related research results were published in the American Chemical Society.

In recent years, wearable, portable electronic devices and MEMS are rapidly developing in the direction of light, short, and multi-functional integration, and it is urgent to develop high-energy density, flexible, and miniaturized energy storage devices.

The research team developed a green electrochemical stripping method to prepare fluorine-doped graphene in one step. Using graphite as a raw material, fluorine-doped graphene is prepared by electrochemically removing the high-efficiency exfoliation of graphite and fluorine doping in a neutral fluorine-containing aqueous electrolyte. The researchers used the mask to assist the filtration method to obtain the fluorine-doped graphene microelectrode, and the high-voltage ionic liquid gel was used as the electrolyte to successfully assemble the high specific energy all-solid micro-supercapacitor.

The micro supercapacitor has excellent flexibility and cycle stability, and the capacity retention rate is 93% after 5000 cycles in a bent state. In addition, the micro energy storage device also exhibits a good modular integration capability to effectively regulate the output operating voltage and capacity. This work provides a new strategy for efficient preparation of doped graphene and high performance micro supercapacitors.