Wang Hai-Long, Su Ting-Ting, Yang Tian-Yi, Ma Li, Ren Wen-Feng, Sun Run-Cang
Liaoning Key Laboratory of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034 Liaoning, China.
Liaoning Key Laboratory of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034 Liaoning, China.
J Colloid Interface Sci. 2025 Jul 15;690:137285. doi: 10.1016/j.jcis.2025.137285. Epub 2025 Mar 9.
High-safety aqueous zinc (Zn) ion batteries confront hydrogen evolution reaction (HER) and dendrite growth of Zn anode, which can be well solved by electrolyte optimization and electrode modification. However, the simultaneously implementation of the electrolyte solvation structure and electrode/electrolyte interface regulation has been ignored and rarely investigated. In this work, inspired by shunt mechanism of hemicellulose in plant kingdom, xylan (XL) was designed and developed as a trace electrolyte additive (ZS@XL) to disperse in aqueous electrolyte and adsorb on Zn anode to simultaneously regulate solvation structure and electrode/electrolyte interface of Zn anode. XL-adsorbed layer can act as "shunt channels" to uniform ion flux and physical barrier to reduce the contact between active HO and Zn metal, thus suppressing dendrite growth and HER. Meanwhile, high binding energy of XL with Zn can destroy the solvation structure of Zn(HO) to decrease the number of active HO and facilitate fast desolvation kinetics for the hindrance of HER. As a result, Zn anode with ZS@XL achieves excellent plating/stripping reversibility of 1400 cycles, long cycling life of 2800 h, as well as Zn-iodine (I) full battery with ZS@XL exhibits excellent cycling performance of 16,000 cycles and practical application to power electric instruments. This work opens a novel route to simultaneously regulate electrolyte solvation structure and electrode/electrolyte interface of Zn anode by biomass materials.
高安全性水系锌离子电池面临析氢反应（HER）和锌负极枝晶生长问题，通过电解液优化和电极改性可很好地解决这些问题。然而，电解液溶剂化结构与电极/电解液界面调控的同时实施一直被忽视且鲜有研究。在这项工作中，受植物界半纤维素分流机制的启发，设计并开发了木聚糖（XL）作为一种微量电解液添加剂（ZS@XL），使其分散在水系电解液中并吸附在锌负极上，以同时调控锌负极的溶剂化结构和电极/电解液界面。XL吸附层可作为“分流通道”使离子通量均匀化，并作为物理屏障减少活性水分子与锌金属的接触，从而抑制枝晶生长和析氢反应。同时，XL与锌的高结合能可破坏Zn(H₂O)₄²⁺的溶剂化结构，减少活性水分子的数量，并促进快速去溶剂化动力学以阻碍析氢反应。结果，含ZS@XL的锌负极实现了1400次循环的优异电镀/剥离可逆性、2800小时的长循环寿命，含ZS@XL的锌-碘（I）全电池展现出16000次循环的优异循环性能，并在电力电子仪器供电方面具有实际应用价值。这项工作开辟了一条通过生物质材料同时调控锌负极电解液溶剂化结构和电极/电解液界面的新途径。
