Graphene conductive inks use screen printing to prepare flat micro-super capacitors

Recently, Wu Zhongshuai, a researcher in the 2D Materials and Energy Devices Research Group of Dalian Institute of Chemical Physics of the Chinese Academy of Sciences, worked with Bao Xin and the team of Chinese Academy of Sciences, as well as Cheng Ming and Ren Wencai of the Institute of Metals of the Chinese Academy of Sciences, to produce highly integrated, flexible and high voltage output graphene-based plane micro-super capacitors on a large scale using screen printing methods.
rapid development of miniaturized and flexible electronic devices, there is a growing demand for the micro-energy storage devices that match them. However, the output voltage and current of a single micro-energy storage device is limited to meet the application needs of electronic devices that require high voltage and high current drive, and in practice it is often necessary to series and/or integrate multiple energy storage devices in series and/or in tandes to increase voltage and/or current
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. At present, integrated energy storage devices generally need to use metal connections, resulting in device integration, mechanical flexibility, complex processing processes, and performance difficult to customize. Therefore, there is an urgent need to develop new large-scale technology to mass prepare highly integrated, customizable performance of micro-energy storage devices.
In this work, the researchers first developed a graphene conductive ink with excellent fluidization and electrochemical properties, and then used screen printing method, using a one-step method to achieve flat and integrated micro-capacitors of the assembly fluid, patterned microelectrors and inter-device conductive connection preparation, greatly simplifying the production process, significantly improving the integration of the device's integrity and mechanical flexibility.
Depending on the actual application needs, researchers can not only effectively regulate the shape and size of integrated micro-capacitors, but also enable the series and concatenation of any number of flat micro-super capacitors, thus effectively customizing output voltages (tens to hundreds of volts) and currents (naaan to milliamps). For example, a miniature supercade module obtained in series from 130 single devices can have an output voltage of more than 100V. This work proves that graphene conductive ink can be used as a fluid collection, conductive connection, and high-capacity electrode material at the same time, screen printing technology can efficiently and large-scale preparation of highly integrated, integrated, high voltage output of the flat micro-capacitor, the modular device has excellent yield, performance consistency, high voltage output and other characteristics, with broad application prospects.
the above-mentioned work has been supported by the National Natural Science Foundation of China, the National Key Research and Development Program, the Dalian Chemical Institute Research and Innovation Fund, etc.