New progress in research on graphene-based linear series supercapacitors

China Instrument Network Instrument Research and Development Recently, the research team of the 2D Materials and Energy Devices Group of the Dalian Institute of Chemicals, Chinese Academy of Sciences, and Professor Bao Zhonghe have made new progress in the research of new concepts, planarization, and self-integrated graphene-based supercapacitors. It was the first to propose that a graphene-based linear series supercapacitor with high voltage output was efficiently produced by spraying method. The related results were published in Advanced Materials (DOI:10.100).

The rapid development of miniaturized and flexible electronic devices has greatly stimulated people's demand for miniature energy storage devices. Conventional single supercapacitors have a low output voltage (<1.0V in the water system). When multiple non-planar energy storage devices are connected in series, the processing steps are complicated and a metal connection is required, which greatly reduces the modular integration and mechanical flexibility of the supercapacitor. Sex, it is difficult to meet the application requirements of future electronic devices for high voltage real scenarios. Therefore, there is an urgent need to develop innovative device configurations and large-scale device manufacturing methods to achieve the purpose of efficiently preparing a novel energy storage device having a high voltage output.

The research team first used a mixed dispersion of electrochemically exfoliated graphene and conductive polymer PH1000 (poly 3,4-ethylenedioxythiophene-polystyrene sulfonic acid) as a highly conductive ink, with the aid of a mask plate, using spraying A planar ultracapacitor module with ten linear devices integrated in series is prepared on A4 paper. The resulting device has good mechanical flexibility and can stably output a high voltage of 8V in an aqueous electrolyte without the need of a metal connection. body. In order to increase the specific capacity of a single device, high-capacity polyaniline-functionalized graphene is used as an electrode material, and a linear series supercapacitor manufactured likewise has a high tantalum capacitance and maintains good series behavior. In order to further increase the output voltage of a single device, two kinds of two-dimensional materials, manganese dioxide nanoplates and electrochemical stripping graphene, were selected as the positive and negative electrodes of the supercapacitors respectively, and an asymmetric linear series superconductor was successfully manufactured on a substrate. The capacitor extends the output voltage from 1.8V for a single asymmetric supercapacitor to 5.4V for three linear series supercapacitors, further increasing the device's output voltage and energy density. This study demonstrates that graphene and other two-dimensional materials have wide applicability in manufacturing linear series supercapacitors with symmetrical and asymmetrical structures, and at the same time provide a kind of planarization, flexibility, and integration of energy storage devices. New strategy.

(Title: New progress in the research of graphene-based linear series supercapacitors)