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Dalian Institute of Chemicals developed a flexible sodium ion micro supercapacitor
[ Instrument Network Instrument Development ] Recently, Wu Zhongshuai, a researcher of the 2D Materials and Energy Devices Research Group (DNL21T3) of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and the Chinese Academy of Sciences academician Bao Xin and the team developed a high energy density, high flexibility, high heat resistance. Performance of a flexible planar sodium ion micro-supercapacitor.
Dalian Institute of Chemical Industry developed a high energy density flexible sodium ion micro supercapacitor
Miniaturized electrochemical energy storage devices have been widely recognized as key power sources for flexible, miniaturized, and intelligent integrated electronic products, such as remote sensors, micro-robots, and self-powered microsystems. Hybrid micro-supercapacitors are a new type of micro-electrochemical energy storage device due to the combination of the high energy density of micro-batteries and the high power density of micro-supercapacitors. Compared with lithium metal, sodium is rich in resources, low in cost, and the electrochemical performance of sodium is similar to that of lithium. Therefore, the development of sodium ion micro energy storage devices has important application prospects.
Recently, the team successfully constructed a flexible planar sodium ion micro-supercapacitor with urchin-like sodium titanate as the battery-type negative electrode and porous activated graphene as the capacitive positive electrode, combined with high-pressure ionic liquid gel electrolyte. Through the effective coupling of the battery type negative electrode and the capacitive positive electrode, the sodium ion micro supercapacitor can work stably at a high voltage of 3.5 V, with a high energy density of 37.1 mWh/cm3 and an ultra-low self-discharge rate (44h, from 3.5V to 2.1V). The sodium ion micro supercapacitor has a multi-directional fast ion diffusion channel, which greatly reduces the charge transfer resistance and significantly increases the power density. At the same time, due to the planar geometry of the device and the non-flammability of the ionic gel electrolyte, the micro device has good mechanical flexibility and high temperature stability of 80 °C.
The above work was funded by the National Natural Science Foundation of China and the National Key Research and Development Program. Related research results are published in Advanced Science.