Guo Panlong, Su Anyu, Wei Yingjin, Liu Xiaokong, Li Yang, Guo Feifan, Li Jian, Hu Zhenyuan, Sun Junqi
ACS Appl Mater Interfaces. 2019 May 29;11(21):19413-19420. doi: 10.1021/acsami.9b02182. Epub 2019 May 14.
High-performance solid-state electrolytes with healability to repair mechanical damages are important for the fabrication of Li-ion batteries (LIBs) with enhanced safety and prolonged service life. In this study, we present the fabrication of healable, highly conductive, flexible, and nonflammable ionogel electrolytes for use in LIBs by loading ionic liquids and Li salts within a hydrogen-bonded supramolecular poly(ionic liquid) copolymer network. The ionogel electrolytes exhibit ionic conductivities as high as 10 S/cm, which is comparable to the conventional liquid electrolytes. The Li/LiFePO battery assembled with the ionogel membrane exhibits excellent cycling performance and delivers a steady high discharge capacity of 147.5 mA h g and Coulombic efficiency of 99.7% after 120 cycles at the charge/discharge rate of 0.2 C. Importantly, the ionogel membranes can heal damages outside or inside a battery because of the reversible nature of the supramolecular interactions between the components. The damaged ionogel membranes after being healed can effectively restore the original performance of the LIBs.
具有可修复机械损伤的高性能固态电解质对于制造具有更高安全性和更长使用寿命的锂离子电池（LIB）至关重要。在本研究中，我们通过将离子液体和锂盐负载在氢键超分子聚（离子液体）共聚物网络中，展示了用于LIB的可自愈、高导电、柔性且不可燃的离子凝胶电解质的制备。该离子凝胶电解质表现出高达10 S/cm的离子电导率，这与传统液体电解质相当。用离子凝胶膜组装的Li/LiFePO电池表现出优异的循环性能，在0.2 C的充放电速率下经过120次循环后，具有147.5 mA h g的稳定高放电容量和99.7%的库仑效率。重要的是，由于组件之间超分子相互作用的可逆性质，离子凝胶膜可以修复电池外部或内部的损伤。愈合后的受损离子凝胶膜可以有效地恢复LIB的原始性能。
