Recently, the team of Wu Zhongshuai, a researcher of the 2D Materials and Energy Devices Research Group (DNL21T3), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and academician Bao Xinhe of the Chinese Academy of Sciences have developed a flexible planar sodium ion with high energy density, high flexibility, and high heat resistance Miniature super capacitors.
Miniaturized electrochemical energy storage devices have been widely regarded as the key power sources for flexible, miniaturized, and intelligent integrated electronic products, such as remote sensors, micro robots, and self-powered micro systems. Hybrid micro-supercapacitor is a new type of micro-electrochemical energy storage device due to the combination of the advantages of high energy density of micro-battery and high power density of micro-supercapacitor. 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 used sea urchin-shaped sodium titanate as a battery-type negative electrode and porous activated graphene as a capacitor-type positive electrode, combined with a high-pressure ionic liquid gel electrolyte to successfully build a flexible planar sodium ion micro-supercapacitor. Through the effective coupling of battery-type negative electrode and capacitor-type positive electrode, the sodium ion micro supercapacitor can work stably at a high voltage of 3.5 V, with high energy density of 37.1 mWh / cm3 and ultra-low self-discharge rate (44h, from 3.5V to 2.1V). The sodium ion mini supercapacitor has multi-directional rapid ion diffusion channels, 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 at 80 ° C.
The above work was supported by the National Natural Science Foundation of China and the National Key R & D Program. Related research results were published in "Advanced Science" (Advanced Science).
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