Aqueous Zn^(2+)/Na^(+) dual-salt batteries with stable discharge voltage and high Coulombic efficiency by systematic electrolyte regulation

作     者：Chunli Wang Lianshan Sun Maoxin Li Lin Zhou Yong Cheng Xin Ao Xiuyun Zhang Limin Wang Bingbing Tian Hong Jin Fan Chunli Wang;Lianshan Sun;Maoxin Li;Lin Zhou;Yong Cheng;Xin Ao;Xiuyun Zhang;Limin Wang;Bingbing Tian;Hong Jin Fan

作者机构：SZU-NUS Collaborative Innovation Center for Optoelectronic Science&TechnologyInternational Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China School of Physical and Mathematical ScienceNanyang Technological UniversitySingapore 637371Singapore China-Singapore International Joint Research InstituteGuangzhou 510663China College of Physics Science and TechnologyYangzhou UniversityYangzhou 225002China State Key Laboratory of Rare Earth Resource UtilizationChangchun Institute of Applied ChemistryCASChangchun 130022China Institute for Energy ResearchJiangsu UniversityZhenjiang 212013China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2022年第65卷第2期

页      面：399-407页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 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：financially supported by the Hightech Research Key laboratory of Zhenjiang(SS2018002) Jiangsu Postdoctoral Research Funding Program(2020Z257) support from MOE Tier 1 grant(RG 157/19) from the China-Singapore International Joint Research Institute(204-A018002) financial support from the Guangdong Natural Science Funds(2019A1515010675) the Science and Technology Project of Shenzhen(JCYJ20210324094206019,KQJSCX20180328094001794)。 

主　　题：dual-salt battery high voltage acetate electrolyte zinc dendrite Na_(3)V_(2)(PO_(4))_(3) 

摘      要：While aqueous Zn-Na hybrid batteries have garnered widespread attention because of their low cost and high safety,it is still challenging to achieve long cycle-life and stable discharge-voltage due to sluggish reaction kinetics,zinc dendrite formation,and side reactions.Herein,we design a Zn^(2+)/Na^(+) dual-salt battery,in which sodiation of the NVP cathode favors zinc intercalation under an energy threshold,leading to decoupled redox reactions on the cathode and anode.Systematic investigations of the electrolyte effects show that the ion intercalation mechanism and the kinetics in the mixture of triflate-and acetate-based electrolytes are superior to those in the common acetate-only electrolytes.As a result,we have achieved fast discharging capability,suppressed zinc dendrites,a stable discharge voltage at 1.45 V with small polarization,and nearly 100%Coulombic efficiency in the dual-salt mixture electrolyte with optimized concentration of 1 M Zn(OAc)_(2)+1 M NaCF_(3)SO_(3).This work demonstrates the importance of electrolyte regulation in aqueous dual-salt hybrid batteries for the energy storage.