Progress in large-scale preparation of highly integrated micro-supercapacitors

[ China Instrument Network Instrument Development ] Recently, Wu Zhongshuai, a researcher of the 2D Materials and Energy Devices Research Group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and the team of the Chinese Academy of Sciences, Bao Xinhe, and the team of the Institute of Metal Research, Chinese Academy of Sciences, Cheng Huiming and Ren Wencai The screen printing method scales the highly integrated, flexible, high-voltage output graphene-based planar micro-supercapacitors, and the related results are published in Energy Environ. Sci.

Progress in large-scale preparation of highly integrated micro-supercapacitors

The rapid development of miniaturized and flexible electronic devices has led to an increasing demand for matching micro-energy storage devices. However, the output voltage and current of a single micro-energy storage device are limited, which is difficult to meet the application requirements of electronic devices that require high-voltage, high-current driving. In practice, multiple energy storage devices are usually required to be connected in series and/or in parallel. Increase voltage and/or current. At present, integrated energy storage devices generally require metal connectors, resulting in device integration, poor mechanical flexibility, complicated processing, and difficult to customize performance. Therefore, there is an urgent need to develop new scale technologies to mass-produce highly integrated, performance-customizable micro-storage devices.

In this work, the researchers first developed a graphene conductive ink with excellent rheology and electrochemical properties, and then used a one-step method to realize the set of planar and integrated micro-supercapacitors by screen printing. The preparation of fluid, patterned microelectrodes and inter-device conductive connections greatly simplifies the fabrication process and significantly improves the integrity and mechanical flexibility of the integrated device. According to different practical application requirements, researchers can not only effectively control the shape and size of integrated micro-super capacitors, but also realize the series-parallel integration of any number of planar micro-super capacitors, thus effectively customizing the output voltage (a few volts to several hundred Volt and current (nano to milliamperes). For example, a micro supercapacitor module obtained by connecting 130 single devices in series can have an output voltage of more than 100V. This work proves that graphene conductive ink can be used as current collector, conductive connector, and high-capacity electrode material. Screen printing technology can produce highly integrated, integrated, high-voltage output planar micro-super efficient and large-scale Capacitors, the modular devices obtained have excellent yield, performance consistency, high voltage output and other features, and have broad application prospects.

The above work was funded by the National Natural Science Foundation of China, the National Key Research and Development Program, and the Dalian Institute of Chemical Research and Innovation Fund.

(Original title: Progress in large-scale preparation of highly integrated micro-supercapacitors)