School of Physics and Electronic Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, 200062, P. R. China.
Department of Molten Salt Chemistry and Engineering, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
Small. 2021 Mar;17(10):e2006807. doi: 10.1002/smll.202006807. Epub 2021 Feb 16.
Ionic conductive hydrogel electrolyte is considered to be an ideal electrolyte candidate for flexible supercapacitor due to its flexibility and high conductivity. However, due to the lack of effective recycling methods, a large number of ineffective flexible hydrogel supercapacitors caused by some irreversible damages and dryness of hydrogel electrolyte are abandoned, which would induce heavy economic and environmental protection problems. Herein,a smart ionic conductive hydrogel (SPMA-Zn: ZnSO /sodium alginate/polymethylacrylic acid) is developed for flexible hybrid supercapacitor (SPMA-ZHS). The SPMA-Zn exhibits an excellent self-healing ability and can recover its electrochemical performance after multiple mechanical damages. More importantly, it possesses an outstanding powder self-healable property, which could easily regenerate the hydrogel electrolyte after powdering, and maintain stable electrochemical performance of SPMA-ZHS. Besides, the SPMA-ZHS displays excellent electrochemical performance with a wide and stable working voltage range of 0-2.2 V, high energy density of 164.13 Wh kg at the power density of 1283.44 Wh kg and good stability with a capacity retention of 95.3% after 5000 charge/discharge cycles at 10 A g . The strategy in this work would provide a new insight in exploring flexible hydrogel electrolyte-based supercapacitor with good sustainability and high energy density for flexible wearable electronic devices.
离子导电水凝胶电解质由于其柔韧性和高导电性，被认为是柔性超级电容器的理想电解质候选物。然而，由于缺乏有效的回收方法，大量由于某些不可逆转的损伤和水凝胶电解质干燥而失效的柔性水凝胶超级电容器被废弃，这将引发严重的经济和环境保护问题。在此，开发了一种用于柔性混合超级电容器（SPMA-ZHS）的智能离子导电水凝胶（SPMA-Zn：ZnSO 4 /海藻酸钠/聚甲基丙烯酸）。SPMA-Zn 表现出优异的自修复能力，在多次机械损伤后可以恢复其电化学性能。更重要的是，它具有出色的粉末自修复性能，在粉末化后可以轻松再生水凝胶电解质，并保持 SPMA-ZHS 的稳定电化学性能。此外，SPMA-ZHS 表现出优异的电化学性能，具有宽而稳定的工作电压范围 0-2.2 V、在 1283.44 Wh kg 的功率密度下具有 164.13 Wh kg 的高能量密度，并且在 10 A g 的电流密度下经过 5000 次充放电循环后具有 95.3%的容量保持率，稳定性良好。这项工作的策略为探索具有良好可持续性和高能量密度的基于柔性水凝胶电解质的超级电容器，用于柔性可穿戴电子设备提供了新的思路。
