Dalian Chemical Research Institute has developed a new method for preparing integrated miniature supercapacitors

Recently, the team of Wu Zhongshuai, a researcher of the two-dimensional material and energy device research group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and the team of academician Bao Xinhe of the Chinese Academy of Sciences, and the team of researcher Wu Renan, used laser pyrolysis of polyimide to realize the graphene electrode The preparation of materials, the construction of micro supercapacitor monomers and the integrated integration of multiple micro supercapacitors.

The rapid development of portable and wearable microelectronic devices has greatly stimulated the demand for flexible miniature energy storage devices. Miniature supercapacitors have many advantages such as fast charge and discharge, high power density, long cycle life, small size, etc., and are considered to be a very competitive micropower source. However, the output voltage and / or current of a single micro-supercapacitor is limited, and it is difficult to meet the application requirements of high-voltage, high-current electronic devices. It is usually necessary to integrate multiple micro supercapacitors in series and / or parallel to increase the voltage and / or current. However, in most of the integrated micro-energy storage devices reported so far, the synthesis of electrode materials, the preparation of patterned micro-electrode monomers, and the integration of multiple micro-supercapacitors generally consist of multiple separate steps, greatly increasing the manufacturing process. the complexity. Therefore, there is an urgent need to develop a simple and efficient preparation method of integrated miniature supercapacitors.

Based on this, the researchers used laser pyrolysis polyimide to prepare the patterned graphene film, which achieved the preparation of micro supercapacitor electrode materials in one step. The construction of a single patterned microelectrode and the integration of multiple microsupercapacitors Integration greatly simplifies the manufacturing process and significantly improves the integrity of integrated devices. According to different practical application requirements, not only can the shape and size of the integrated micro-supercapacitor be effectively regulated, but also the serial-parallel integration of any number of planar micro-supercapacitors can be realized to effectively customize the output operating voltage and current. Since the current collector, electrode and conductive connector of the integrated miniature supercapacitor have the same composition and are manufactured in one step, the resulting device has good integration, flexibility and consistent performance. In addition, the device exhibits excellent high-temperature stability in ionic liquid electrolytes and can work stably at 100 ° C. Therefore, this work provides a new strategy for efficient and simplified preparation of highly integrated miniature supercapacitors, and broadens its potential application scenarios.

The above work was supported by the National Natural Science Foundation of China, the National Key R & D Program, and the Dalian Chemical Research Institute Innovation Fund. Related achievements were published in the recent "Advanced Functional Materials" (Adv. Funct. Mater.).

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