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Integrated electrolyte regulation strategy: Trace trifunctional tranexamic acid additive for highly reversible Zn metal anode and stable aqueous zinc ion battery
Energy Storage Materials ( IF 20.4 ) Pub Date : 2023-05-03 , DOI: 10.1016/j.ensm.2023.102800
Junyi Yin, Haoliang Liu, Peng Li, Xiang Feng, Minghui Wang, Chenyang Huang, Mingyan Li, Yaqiong Su, Bing Xiao, Yonghong Cheng, Xin Xu

Aqueous zinc ion batteries (AZIBs) are appealing increasing attention for large-scale energy storage systems (ESS) due to their intrinsic safety, low cost, and scalability. Unfortunately, the Zn metal anode suffers from chaotic side reactions, rampant dendrite growth and continuous hydrogen evolution, severely hampering the application of AZIBs. Herein, the trifunctional tranexamic acid (TXA) is introduced into aqueous electrolyte to form unique anode/electrolyte interface, enhance steric effect and regulate Zn2+ solvation structure. Theoretical calculations first illustrate the mechanism of TXA additive on Zn metal anode and electrolyte. Experimental results and molecular dynamic simulations further demonstrate the vital role of TXA in simultaneously regulating the anode interface chemistry and electrolyte environment. Consequently, Zn//Zn symmetric cells deliver a durable lifespan of over 2000 h at 1 mA cm–2, and a high cumulative capacity at 5 mA cm–2. A highly reversible Zn plating/stripping processes for over 1000 cycles in Zn//Cu asymmetric cells are also achieved. Moreover, the assembled Zn//NiCo-MnO2 and Zn//NH4V4O10 full cells exhibit stable cycling performance and high capacity retentions. This work proposes a novel and facile integrated electrolyte regulation strategy to realize dendrite-free Zn anodes and stable full cells, which is favorable for advanced AZIBs and beyond.



中文翻译:

集成电解质调节策略:用于高可逆锌金属负极和稳定水系锌离子电池的微量三功能氨甲环酸添加剂

由于其固有的安全性、低成本和可扩展性,水系锌离子电池 (AZIB) 越来越受到大规模储能系统(ESS) 的关注。不幸的是,锌金属负极存在混乱的副反应、猖獗的枝晶生长和持续的析氢,严重阻碍了 AZIB 的应用。在此,将三官能氨甲环酸 (TXA) 引入水性电解质中,形成独特的阳极/电解质界面,增强空间效应并调节 Zn 2+溶剂化结构。理论计算首先说明了 TXA 添加剂对锌金属负极和电解液的作用机理。实验结果和分子动力学模拟进一步证明了 TXA 在同时调节阳极界面化学和电解质环境方面的重要作用。因此,Zn//Zn 对称电池在 1 mA cm –2时具有超过 2000 小时的耐用寿命,在 5 mA cm –2时具有高累积容量。还实现了在 Zn//Cu 不对称电池中超过 1000 次循环的高度可逆的 Zn 电镀/剥离过程。此外,组装的Zn//NiCo-MnO 2和Zn//NH 4 V 4 O 10全电池表现出稳定的循环性能和高容量保持率。这项工作提出了一种新颖、简便的集成电解质调节策略,以实现无枝晶锌负极和稳定的全电池,这有利于先进的 AZIBs 及以后的发展。

更新日期:2023-05-06
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