Wang Biao, Guan Chaohong, Zhou Qing, Wang Yiqing, Zhu Yutong, Bian Haifeng, Chen Zhou, Zhang Shuangbin, Tan Xiao, Luo Bin, Tang Shaochun, Meng Xiangkang, Zhang Cheng
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Queensland, 4072, Australia.
Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.
Nanomicro Lett. 2025 Jun 26;17(1):314. doi: 10.1007/s40820-025-01826-w.
Zwitterionic materials with covalently tethered cations and anions have great potential as electrolyte additives for aqueous Zn-ion batteries (AZIBs) owing to their appealing intrinsic characteristics and merits. However, the impact of cationic and anionic moieties within zwitterions on enhancing the performance of AZIBs remains poorly understood. Herein, three zwitterions, namely carboxybetaine methacrylate (CBMA), sulfobetaine methacrylate (SBMA), and 2-methacryloyloxyethyl phosphorylcholine (MPC), were selected as additives to investigate their different action mechanisms in AZIBs. All three zwitterions have the same quaternary ammonium as the positively charged group, but having different negatively charged segments, i.e., carboxylate, sulfonate, and phosphate for CBMA, SBMA, and MPC, respectively. By systematical electrochemical analysis, these zwitterions all contribute to enhanced cycling life of Zn anode, with MPC having the most pronounced effect, which can be attributed to the synergistic effect of positively quaternary ammonium group and unique negatively phosphate groups. As a result, the Zn//Zn cell with MPC as additive in ZnSO electrolyte exhibits an ultralong lifespan over 5000 h. This work proposes new insights to the future development of multifunctional zwitterionic additives for remarkably stable AZIBs.
具有共价连接阳离子和阴离子的两性离子材料，因其具有吸引人的内在特性和优点，作为水系锌离子电池（AZIBs）的电解质添加剂具有巨大潜力。然而，两性离子中阳离子和阴离子部分对提高AZIBs性能的影响仍知之甚少。在此，选择了三种两性离子，即甲基丙烯酸羧基甜菜碱（CBMA）、甲基丙烯酸磺基甜菜碱（SBMA）和2-甲基丙烯酰氧乙基磷酰胆碱（MPC）作为添加剂，以研究它们在AZIBs中的不同作用机制。这三种两性离子都具有相同的季铵作为带正电荷的基团，但具有不同的带负电荷的片段，即CBMA、SBMA和MPC分别为羧酸盐、磺酸盐和磷酸盐。通过系统的电化学分析，这些两性离子都有助于提高锌负极的循环寿命，其中MPC的效果最为显著，这可归因于正季铵基团和独特的负磷酸盐基团的协同作用。因此，在ZnSO电解质中以MPC作为添加剂的Zn//Zn电池表现出超过5000小时的超长寿命。这项工作为开发用于显著稳定的AZIBs的多功能两性离子添加剂的未来发展提出了新的见解。
