Tang Cheng, Li Manni, Du Jianglong, Wang Yaling, Zhang Yan, Wang Guolong, Shi Xiaowei, Li Yingbo, Liu Jiamei, Lian Cheng, Li Lei
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi 710049, China.
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
J Colloid Interface Sci. 2022 Feb 15;608(Pt 2):1162-1172. doi: 10.1016/j.jcis.2021.10.090. Epub 2021 Oct 20.
Increasing the electrochemical stability window and working temperature range of supercapacitor aqueous electrolyte is the major task in order to advance aqueous electrolyte-based supercapacitors. Here, a supramolecular induced new electrolyte of lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) in dimethyl sulfoxide (DMSO) and water co-solvent system is proposed. Adjusting the coordination structure among LiTFSI, DMSO, and water in the electrolyte via supramolecular interactions results in its high ionic conductivity, low viscosity, wide electrochemical stability window, and large working temperature range. The new electrolyte-based supercapacitors can work in 2.40 V working potential and 130 °C working-temperature range from -40 to 90 °C. The devices exhibit good electrochemical performances, especially the energy density over 21 Wh kg, which is much higher than that with traditional aqueous electrolytes (<10 Wh kg). The work paves a way to develop high-performance aqueous electrolytes for supercapacitors.
扩大超级电容器水性电解质的电化学稳定窗口和工作温度范围是推进基于水性电解质的超级电容器发展的主要任务。在此，提出了一种在二甲基亚砜（DMSO）和水的共溶剂体系中由超分子诱导的双（三氟甲磺酰）亚胺锂（LiTFSI）新型电解质。通过超分子相互作用调节电解质中LiTFSI、DMSO和水之间的配位结构，使其具有高离子电导率、低粘度、宽电化学稳定窗口和大工作温度范围。基于这种新型电解质的超级电容器能够在2.40 V的工作电势以及-40至90°C的130°C工作温度范围内工作。这些器件展现出良好的电化学性能，尤其是能量密度超过21 Wh kg，这比传统水性电解质（<10 Wh kg）的能量密度高得多。这项工作为开发用于超级电容器的高性能水性电解质铺平了道路。
