Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany.
Institute of Organic and Macromolecular Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
Angew Chem Int Ed Engl. 2023 Jan 9;62(2):e202214927. doi: 10.1002/anie.202214927. Epub 2022 Dec 7.
For sustainable energy storage, all-organic batteries based on redox-active polymers promise to become an alternative to lithium ion batteries. Yet, polymers contribute to the goal of an all-organic cell as electrodes or as solid electrolytes. Here, we replace the electrolyte with a deep eutectic solvent (DES) composed of sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) and N-methylacetamide (NMA), while using poly(2,2,6,6-tetramethylpiperidin-1-yl-oxyl methacrylate) (PTMA) as cathode. The successful combination of a DES with a polymer electrode is reported here for the first time. The electrochemical stability of PTMA electrodes in the DES at the eutectic molar ratio of 1 : 6 is comparable to conventional battery electrolytes. More viscous electrolytes with higher salt concentration can hinder cycling at high rates. Lower salt concentration leads to decreasing capacities and faster decomposition. The eutectic mixture of 1 : 6 is best suited uniting high stability and moderate viscosity.
为了实现可持续的能源存储，基于氧化还原活性聚合物的全有机电池有望成为锂离子电池的替代品。然而，聚合物可以作为电极或固体电解质来实现全有机电池的目标。在这里，我们用由双（三氟甲烷磺酰基）亚胺钠（NaTFSI）和 N-甲基乙酰胺（NMA）组成的深共晶溶剂（DES）取代电解质，同时使用聚（2,2,6,6-四甲基哌啶-1-基-氧化甲基丙烯酸酯）（PTMA）作为阴极。本文首次报道了 DES 与聚合物电极的成功组合。在摩尔比为 1:6 的共晶条件下，PTMA 电极在 DES 中的电化学稳定性可与传统电池电解质相媲美。具有更高盐浓度的更粘稠电解质可能会阻碍高速率循环。较低的盐浓度会导致容量下降和更快的分解。摩尔比为 1:6 的共晶混合物结合了高稳定性和适度的粘度，是最佳选择。
