Recently, Wu Zhongshuai, a researcher at the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences, led a two-dimensional materials and energy device research team and a team of experts and academicians to make new progress in the research of flexible, planarized and integrated all-graphene-based supercapacitors , realizing on a substrate. The fabrication of supercapacitors with arbitrary shapes and their modular integration, the relevant research results were published in the American Chemical Society Nano-Journal.
The rapid development of ultra-thin, ultra-light, flexible, and unconventional shape micro-nanoelectronic devices has placed higher demands on the supporting micro-nano energy system. Traditional energy storage devices, such as lithium-ion batteries and supercapacitors, have a single shape, large size, volume, and mass; there are also problems such as electrolyte leakage, use of conductive additives and binders, and thick separators. At the same time, the use of two substrates is not conducive to the improvement of mechanical flexibility of the device, and cannot meet the requirements of diversity, flexibility, and multifunctional integrated circuits. Therefore, there is a need to develop new energy storage devices.
The researchers proposed the concept of constructing a planar supercapacitor of any shape and sandwich structure on a substrate. Electrochemical exfoliation of graphene as electrode material and nano-graphene oxide as separator. With the aid of a shape-controllable reticle, a layer-by-layer spray coating was successfully used to successfully fabricate an arbitrary shape, all graphene-based on a flexible substrate. Flat supercapacitor with sandwich structure. Compared with traditional flexible devices, the capacitors not only have a variety of shapes, such as rectangular, circular, hollow square, numbers, letters and more complex cross-linearity, but also have a higher volumetric specific capacity (280F/cm3). High energy density (2.9mWh/cm3) and excellent mechanical flexibility. Tested under different bending conditions, there is basically no loss in specific capacity. By covering the effective electrode area with the gel electrolyte, effective regulation of the specific capacity of a single device can be achieved. At the same time, the manufacturing method can be suitable for large-scale production and self-integration, and realizes serial and parallel integration of multiple devices without using conventional metal wires and contacts, and effectively regulates the output voltage and capacity of the modular power source.
The work has been innovative in terms of material selection, electrode preparation, electrolyte and membrane selection, device assembly and modular integration, and provides a scientific basis for the effective construction, production and integration of any shape energy storage devices.
The above work was funded by the National Youth Thousand Talents Program, the National Key Research and Development Program, the National Natural Science Foundation, and the Natural Science Foundation of Liaoning Province.
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