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The invention relates to a new flexible energy storage nanofiber prepared by microfluid electrostatic spinning method

Time : 2020-09-28 Hits : 12

In recent years, with the development of science and the constant change of technology, smart wearable devices have become one of the research hotspots. In order to meet the power demand of wearable electronic products, the application of new energy storage technology in high-end intelligent wearable device industry has attracted much attention. The development of flexible supercapacitors (FSCs) with high energy density has become one of the great challenges in the field of new energy.

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The two-dimensional boron nanosheet is theoretically four times more capacitive than graphene and is one of the preferred materials for the electrodes of supercapacitors. However, due to its inter-layer conductance difference, small specific surface area and low porosity, it will seriously restrict charge transfer, ion diffusion and storage when applied to supercapacitors, resulting in its energy density is difficult to improve. Therefore, the development of new 2-D boron-based FSCs with high porosity, large specific surface area and high energy density has become an important research topic.

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In order to solve the above problems, the research team of Nanjing University of Technology started from designing the ordered nanostructure of boron nanosheet and prepared the anisotropic boron-carbon heterogeneous nanosheet (ABCNs) fiber electrode by using micro-fluid electrostatic spinning technology. Based on the bottom-up gas-phase stripping and condensation strategy, the b-B bond between the massive boron was opened to form a 2-D boron nanosheet. At the same time, b-C chemical bond was introduced into the b-C nanosheet, and the nitrogen-doped carbon nanosheet was bribed in situ to form a boron-carbon double-layer heterogeneous nanosheet. The nanosheet can enhance interface coupling, improve charge transfer ability, and efficiently promote ion kinetic diffusion and storage.

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The synthesis principle of ABCNs and the morphology of block boron, boron nanosheet and ABCNs


At the same time, aiming at the problem of poor mechanical flexibility and difficulty in large-area preparation of FSCs electrodes, researchers constructed fabric electrodes with high flexibility and high conductivity by using microfluid electrostatic spinning method (compared with traditional electrostatic spinning, the composition and structure of spinning fluid can be dynamically controlled by using laminar flow and diffusion characteristics of fluids). The FSCs constructed with the fabric electrode showed ultra-high energy storage capacity, with an energy density of 167.05 mWh/cm3 and a volume specific capacitance of 534.5 F/cm3, which provided a basis for the wearable large deformation power supply application of FSCs.

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ABCNs nanocomposite fiber membrane prepared by microfluidic electrospinning and its properties


Based on the above research, FSCs and pressure sensors are integrated into the fabric to form a wearable energy-sensing system, which can steadily monitor various physiological signals of the human body in real time, such as wrist pulse, heartbeat, finger, back and neck bending signals, etc., providing a new way for the practical application of FSCs in the wearable field.

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Wearable energy storage - sensing system and its application


The thesis links: https://doi.org/10.1002/anie.202011523

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