Zhan Shuai, Wang Chunfang, Zhong Leheng, Zhao Linwei, Yang Xiaodong, Guo Amy X Y, Xiong Wei, Cheng Liangjie, Li Ran, Tang Zijie, Cao Shan Cecilia, Zhi Chunyi, Lv Lyu Haiming
Materials Genome Institute, Shanghai University, Shanghai, 200444, China.
Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
Small. 2024 Nov;20(45):e2402767. doi: 10.1002/smll.202402767. Epub 2024 Jul 31.
Electroactive organic electrode materials exhibit remarkable potential in aqueous zinc ion batteries (AZIBs) due to their abundant availability, customizable structures, sustainability, and high reversibility. However, the research on AZIBs has predominantly concentrated on unraveling the storage mechanism of zinc cations, often neglecting the significance of anions in this regard. Herein, bipolar poly(thionine) is synthesized by a simple and efficient polymerization reaction, and the kinetics of different anions are investigated using poly(thionine) as the cathode of AZIBs. Notably, poly(thionine) is a bipolar organic polymer electrode material and exhibits enhanced stability in aqueous solutions compared to thionine monomers. Kinetic analysis reveals that ClO exhibits the fastest kinetics among SO , Cl, and OTF, demonstrating excellent rate performance (109 mAh g @ 0.5 A g and 92 mAh g @ 20 A g). Mechanism studies reveal that the poly(thionine) cathode facilitates the co-storage of both anions and cations in Zn(ClO). Furthermore, the lower electrostatic potential of ClO influences the strength of hydrogen bonding with water molecules, thereby enhancing the overall kinetics in aqueous electrolytes. This work provides an effective strategy for synthesizing high-quality organic materials and offers new insights into the kinetic behavior of anions in AZIBs.
由于具有丰富的可获得性、可定制的结构、可持续性和高可逆性，电活性有机电极材料在水系锌离子电池（AZIBs）中展现出显著的潜力。然而，对AZIBs的研究主要集中在揭示锌阳离子的存储机制上，在这方面常常忽视了阴离子的重要性。在此，通过简单高效的聚合反应合成了双极性聚（硫堇），并以聚（硫堇）作为AZIBs的阴极研究了不同阴离子的动力学。值得注意的是，聚（硫堇）是一种双极性有机聚合物电极材料，与硫堇单体相比，在水溶液中表现出更高的稳定性。动力学分析表明，在SO 、Cl和OTF中，ClO 的动力学最快，展现出优异的倍率性能（在0.5 A g 时为109 mAh g ，在20 A g 时为92 mAh g ）。机理研究表明，聚（硫堇）阴极有利于Zn(ClO) 中阴离子和阳离子的共存储。此外，ClO 较低的静电势影响了与水分子氢键的强度，从而提高了水系电解质中的整体动力学。这项工作为合成高质量有机材料提供了一种有效策略，并为AZIBs中阴离子的动力学行为提供了新的见解。
