Wang Shuaihua, Li Yuchen, Yu Mao, Li Qikai, Li Huan, Wang Yupeng, Zhang Jiajia, Zhu Kang, Liu Weishu
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China.
Nat Commun. 2024 Feb 8;15(1):1172. doi: 10.1038/s41467-024-45432-7.
Ionic thermoelectric (i-TE) liquid cells offer an environmentally friendly, cost effective, and easy-operation route to low-grade heat recovery. However, the lowest temperature is limited by the freezing temperature of the aqueous electrolyte. Applying a eutectic solvent strategy, we fabricate a high-performance cryo-temperature i-TE liquid cell. Formamide is used as a chaotic organic solvent that destroys the hydrogen bond network between water molecules, forming a deep eutectic solvent that enables the cell to operate near cryo temperatures (down to -35 °C). After synergistic optimization of the electrode and cell structure, the as-fabricated liquid i-TE cell with cold (-35 °C) and hot (70 °C) ends achieve a high power density (17.5 W m) and a large two-hour energy density (27 kJ m). In a prototype 25-cell module, the open-circuit voltage and short-circuit current are 6.9 V and 68 mA, respectively, and the maximum power is 131 mW. The anti-freezing ability and high output performance of the as-fabricated i-TE liquid cell system are requisites for applications in frigid regions.
离子热电（i-TE）液体电池为低品位热量回收提供了一条环境友好、成本效益高且操作简便的途径。然而，其最低温度受水性电解质凝固温度的限制。采用共晶溶剂策略，我们制备了一种高性能的低温i-TE液体电池。甲酰胺用作一种能破坏水分子间氢键网络的无序有机溶剂，形成一种深共晶溶剂，使电池能够在接近低温（低至-35°C）的温度下运行。在对电极和电池结构进行协同优化后，所制备的具有冷端（-35°C）和热端（70°C）的液体i-TE电池实现了高功率密度（17.5 W m）和大的两小时能量密度（27 kJ m）。在一个由25个电池组成的原型模块中，开路电压和短路电流分别为6.9 V和68 mA，最大功率为131 mW。所制备的i-TE液体电池系统的抗冻能力和高输出性能是其在寒冷地区应用的必要条件。
