Hu Ankang, Liu Chen, Cui Zeyu, Cong Zhenhua, Niu Jian
Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China.
State Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
ACS Appl Mater Interfaces. 2022 Mar 16;14(10):12713-12721. doi: 10.1021/acsami.2c01137. Epub 2022 Mar 1.
Nonvolatile ionogels are promising soft electrolyte materials for flexible electronics, but it is challenging to fabricate stable electrolytes with mechanical robustness. Here, through rationally optimizing the chemical structure of polymer matrix and ionic liquids, the high-performance ionogel electrolytes with mechanical robustness and stability were fabricated. There are double hydrogen bonding networks in the as-prepared ionogel electrolytes, one of which exists between the polymer chains while the other one existing between the polymer chains and ionic liquid molecules. By adjusting the content of the ionic liquid and the ratio of the two hydrogen bonding networks, the prepared ionogel electrolytes exhibit tunable properties with an elasticity of 1.3-30 kPa, a stretchability of more than 1800%, a fracture energy of 125.8-548.3 KJ m, and a coordinated self-healing efficiency of 6.2-37.9% to satisfy the needs of different application scenarios. The assembled wearable sensors based on the high-performance ionogel electrolytes can be attached to a part of the human body, detecting various motions and body temperature. Benefiting from the nonvolatile and hydrophobic properties of the ionogel electrolytes, the wearable sensors can be operated under extreme environments including high/low temperature (-15100 °C) and high humidity (100% relative humidity). It is believed that this work provides prospects for the application of wearable electronic devices.
非挥发性离子凝胶是用于柔性电子器件的有前途的软电解质材料，但制备具有机械稳健性的稳定电解质具有挑战性。在此，通过合理优化聚合物基体和离子液体的化学结构，制备出了具有机械稳健性和稳定性的高性能离子凝胶电解质。所制备的离子凝胶电解质中存在双氢键网络，其中一个存在于聚合物链之间，另一个存在于聚合物链与离子液体分子之间。通过调节离子液体的含量和两个氢键网络的比例，所制备的离子凝胶电解质表现出可调的性能，弹性为1.3 - 30 kPa，拉伸率超过1800%，断裂能为125.8 - 548.3 KJ/m，协同自修复效率为6.2 - 37.9%，以满足不同应用场景的需求。基于高性能离子凝胶电解质组装的可穿戴传感器可附着在人体的一部分上，检测各种运动和体温。受益于离子凝胶电解质的非挥发性和疏水性，可穿戴传感器可在包括高/低温（-15至100°C）和高湿度（100%相对湿度）的极端环境下运行。相信这项工作为可穿戴电子设备的应用提供了前景。
