Deposition and etching of(101)_(Zn)facet exposed zinc electrode induced by trace COS achieving ultra-long cycle stability in zinc batteries  

作　　者：Keren Lu Haiyan Jing Qiubo Guo Cai Liu Boyuan Liu Xifeng Xia Fengyun Wang Wu Lei Mingzhu Xia Qingli Hao 

机构地区：[1]Key Laboratory for Soft Chemistry and Functional Materials,Ministry of Education,School of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2025年第3期37-48,共12页能源化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(52161145503)。

摘　　要：Rechargeable aqueous zinc-based batteries(RZBs)often suffer from poor cycling stability due to the instability of zinc deposition and etching processes.This work achieves dendrite-free zinc deposition with a smaller nucleation radius and rapid completion of the nucleation stage by a"triple regulation strategy"with trace chitosan oligosaccharide(COS)in ZnSO_(4)electrolyte(2 g L^(-1)COS),Theoretical and experimental results indicate that COS,with hydroxyl and amino functional groups,exhibits a high affinity for the(002)_(Zn)and(100)_(Zn)facets.Under the influence of a small amount of COS,the selective exposure of the(101)_(Zn)facet is facilitated.The extensively exposed(101)_(Zn)facet is protected by COS,which inhibits the occurrence of side reactions.Moreover,the presence of trace COS-02 changes the etching mode from three-dimensional(3D)to two-dimensional(2D),ensuring a uniform distribution of Zn^(2+)in the electric field during the deposition process.The unique 3D deposition and 2D etching mechanism induced by the COS additive result in exceptional cycling stability,exceeding 3800 h(1 mA cm^(-2))and 430 h(5 mA cm^(-2))in zinc symmetrical cells.Additionally,COS acts as a"molecular pillar"to stabilize VS_(2),enabling the Zn‖VS_(2)full cell to achieve 1000 stable cycles with 89.6%capacity retention and an average coulombic efficiency of 99.95%.This work reveals a novel multiple regulation mechanism by using trace COS in RZBs,and provides a new approach for the development of long-term stable RZBs with preferential exposure facets.

关 键 词：Side reactions Shell oligosaccharides Interface regulation Electrolyte additive Aqueous Znbatteries 

分 类 号：TM911.1[电气工程—电力电子与电力传动] TM912