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 Zn2+/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 NaCF3SO3.This work demonstrates the importance of electrolyte regulation in aqueous dual-salt hybrid batteries for the energy storage.

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

SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology,International Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology of Ministry of Education,Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China;School of Physical and Mathematical Science,Nanyang Technological University,Singapore 637371,Singapore;Institute for Energy Research,Jiangsu University,Zhenjiang 212013,China;State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,CAS,Changchun 130022,China;College of Physics Science and Technology,Yangzhou University,Yangzhou 225002,China;China-Singapore International Joint Research Institute,Guangzhou 510663,China

中国科学:化学（英文版）

[1]Chunli Wang;Lianshan Sun;Maoxin Li;Lin Zhou;Yong Cheng;Xin Ao;Xiuyun Zhang;Limin Wang;Bingbing Tian;Hong Jin Fan-.Aqueous Zn2+/Na+dual-salt batteries with stable discharge voltage and high Coulombic efficiency by systematic electrolyte regulation)[J].中国科学:化学（英文版）,2022(02):399-407

Na+dual,triflate,NaCF3SO3

Aqueous,Zn2+,salt,batteries,stable,discharge,voltage,high,Coulombic,efficiency,by,systematic,regulation,While,aqueous,hybrid,have,garnered,widespread,attention,because,their,low,cost,safety,still,challenging,long,cycle,life,due,sluggish,kinetics,zinc,formation,side,reactions,Herein,we,design,battery,which,sodiation,NVP,cathode,favors,intercalation,under,energy,threshold,leading,decoupled,redox,anode,Systematic,investigations,effects,show,that,mechanism,mixture,acetate,electrolytes,are,superior,those,common,only,result,achieved,fast,discharging,capability,suppressed,dendrites,small,polarization,nearly,optimized,concentration,OAc,2+1,This,work,demonstrates,importance,storage

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