Self-healable and stretchable ionogels serve as electrolytes and substrates for integrated all-in-one micro-supercapacitors
Self-healable and stretchable ionogels serve as electrolytes and substrates for integrated all-in-one micro-supercapacitors
复制标题
可自修复和可拉伸的离子凝胶可用作集成一体化微型超级电容器的电解质和基材
DOI：
10.1016/j.cej.2019.123645
复制
发表时间：
2020-07-15
影响因子：
15.1
通讯作者：
Xu, Xinhua
中科院分区：
文献类型：
--
作者：
Shi, Yunhui;Wang, Yutian;Xu, Xinhua
Self-healable and stretchable electrolytes are extremely desirable for next-generation flexible energy storage devices. Nevertheless, most of previously reported autonomous self-healing electrolytes possess only moderate mechanical strength and recoverability, as well as poor ionic conductivity and low operating voltage window. In this work, a type of ionogel electrolytes is reported on the basis of a dual-dynamic network composed of metal-ligand (Li+ -PEO) coordination and hydrogen bonding. Impressively, the ionogel electrolytes exhibit high tensile fracture strength (0.96 MPa), stretchability (approximate to 1847%) and electrochemical stability up to about - 4 to 4 V. A novel all-in-one self-healable micro-supercapacitor prototype is proposed by adopting direct ink writing technique, whereas the electrode material is directly printed onto the ionogel film which acts as a flexible substrate and gel-electrolyte simultaneously. The maximum energy density of the all-in-one micro-supercapacitor reaches 81.88 mu Wh cm(-2) at a power density of 0.75 mW cm(-2). In the absence of external stimulus, the damaged micro-supercapacitor can achieve up to 98% self-healing efficiency after 2 min at room temperature. Our research provides new fundamental insights into the construction of stretchable and self-healable ionogels and offers guidelines for the design of integrated micro-supercapacitors to deliver better electrochemical performance.
