Bifunctional electrolyte regulation towards low-temperature and high-stability Zn-ion hybrid capacitor

作     者：Shuo Yang Kui Xue Haiyang Liao Yuning Guo Liujiang Zhou Yongqi Zhang Shuo Yang;Kui Xue;Haiyang Liao;Yuning Guo;Liujiang Zhou;Yongqi Zhang

作者机构：Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731SichuanChina School of PhysicsUniversity of Electronic Science and Technology of ChinaChengdu 611731SichuanChina School of Mechanical EngineeringHunan University of TechnologyZhuzhou 412007HunanChina Yangtze Delta Region Institute(Huzhou)University of Electronic Science and Technology of ChinaHuzhou 313002ZhejiangChina State Key Lab of Silicon MaterialsZhejiang UniversityHangzhou 310027ZhejiangChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第79卷第4期

页      面：495-504页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(52002052) the Startup funds of Outstanding Talents of UESTC(A1098531023601205) the National Youth Talents Plan of China(G05QNQR049) the Foundation of State Key Laboratory of Silicon Materials(SKL2021-12)。 

主　　题：Hybrid electrolyte Zn-ion capacitor Anti-hydrolysis Low temperature Dendrite-free 

摘      要：Aqueous Zinc-based energy storage devices are considered as one of the potential candidates in future power technologies.Nevertheless,poor low temperature performance and uncontrollable Zn dendrite growth lead to the limited energy storage capability.Herein,an anti-hydrolysis,cold-resistant,economical,safe,and environmentally friendly electrolyte is developed by utilizing water,ethylene glycol(EG),and ZnCl_(2)with high ionic conductivity(7.9 mS cm^(-1)in glass fiber membrane at-20℃).The spectra data and DFT calculations show the competitive coordination of EG and Cl-to induce a unique solvation configuration of Zn^(2+),conducive to effectively inhibiting the hydrolysis of Zn^(2+),suppressing the dendrite growth,and broadening the working voltage range and temperature range of ZnCl_(2)electrolyte.The isotope tracing data confirm that Cl^(-)could effectively destroy the ZnO passivation film,promoting the formation of Zn nuclei and improving its reaction activity.Compared to the corresponding ZnSO4electrolyte,the Cu/Zn half-cell with the ZnCl_(2)electrolyte exhibits a stable cycle life of more than 1600 h at-20℃,even at the current density of 5 mA cm^(-2).The assembled Zn-ion hybrid capacitor possesses an average capacity of 42.68 m A h g^(-1)under-20℃at a current density of 5 A g^(-1),3.5 times than that of the modified ZnSO4electrolyte.Our work proposes a new approach for optimizing aqueous electrolytes to meet low temperature energy storage applications.