Printing graphene supercapacitors, a major breakthrough!
Release time:
2024-12-27
Recently, the research team led by researcher Wu Zhongshuai from the State Key Laboratory of Catalysis at the Dalian Institute of Chemical Physics
Recently, the research team led by researcher Wu Zhongshuai from the State Key Laboratory of Catalysis at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, collaborated with Professor Wu Mingbo's team from China University of Petroleum (East China) to make progress in the research of 3D printed graphene micro-supercapacitors. They developed high-quality, additive-free graphene ink suitable for 3D printing and fabricated micro-supercapacitors with high integration density, high output voltage, and high voltage density.
Graphene has excellent mechanical, electrical, and thermal properties. Therefore, graphene and its inks have broad application prospects in fields such as flexible electronic devices, thermal management devices, and biomaterials. However, existing 3D printed graphene inks involve graphene oxide and various additives, which reduce the conductivity, thermal conductivity, and energy density of the devices. Additionally, the required freeze-assisted printing, reduction post-processing, and freeze-drying processes increase the complexity and cost of the process, making it difficult to meet the commercialization needs of 3D printed graphene inks.
This research developed a 3D printed graphene ink using electrochemically exfoliated graphene, glycerol, and water as raw materials, without high molecular rheological agents, achieving a cost-effective, highly robust, and environmentally friendly ink. The microelectrodes or devices printed with this ink do not contain inactive materials such as polymers, reducing their adverse effects on energy storage and other potential application fields. The team used EMIMBF4/PVDF-HFP ionic gel as a quasi-solid-state electrolyte, improving the electrochemical performance of the 3D printed graphene micro-supercapacitors, with an areal capacitance of 4900 mF/cm2, a volumetric capacitance of 195.6 F/cm3, an areal energy density of 2.1 mWh/cm2, and a volumetric energy density of 23 mWh/cm3, achieving stable cycling performance at a high voltage of 3.5V and a high temperature of 100°C.
In addition, to meet the requirements of actual electronic devices for high operating voltages, this work achieved high integration of micro-supercapacitors with high device count, high integration density, high output voltage, and high voltage density in 3D printed monolithic integrated devices. The above results are expected to lay a scientific foundation for the commercialization of graphene in the field of 3D printing and provide application guidance.
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