Aqueous rechargeable multiple metal-ion storage battery(ARSB)has a large potential in energy storage devices due to their safe usage,low cost and high rate capability.Nevertheless,the performance of prac-tical ARSB is largely restricted by low capacity and limited cathode materials.Herein,we demonstrate an efficient cathode material based on CoNi-layered double hydroxide(LDH)nanosheets arrays with abun-dant hydrogen vacancy induced by electrochemical activation process for high performance of cations storage.Consequently,the electrochemical activated CoNi-LDH(ECA-CoNi-LDH)nanosheets arrays exhi-bit high metal ion(Li+,Na+,Zn2+,Mg2+and Ca2+)storage capacities,which is 9 times and 3 times higher that of unactivated CoNi-LDH arrays and ECA-CoNi-LDH without hierarchical structure,respectively.Moreover,the ECA-CoFe-LDH also shows the possibility for practical applications in actual batteries.By coupling with a Fe2O3/C anode,the assembled aqueous battery delivered a large energy density of 184.4 Wh kg-1 at power density of 4 Wh kg-1 in high voltage range of 0-2 V.To our best knowledge,such high energy density and large working window of our assembled aqueous battery is exceeded other LDH-based aqueous battery or supercapacitor,and the energy density almost comparable than that of com-mercial Li-ion batteries.Moreover,almost no measurable capacitance losses can be detected even after 10000 cycles.In addition,this work also provides a strategy to develop a high energy density cathode for multiple metal-ion storage batteries.

State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China

[1]Wang Qiao;Bowen Jin;Wenfu Xie;Mingfei Shao;Min Wei-.Hierarchical CoNi-LDH nanosheet array with hydrogen vacancy for high-performance aqueous battery cathode)[J].能源化学,2022(06):9-15

ARSB

Hierarchical,CoNi,LDH,hydrogen,vacancy,performance,aqueous,battery,cathode,Aqueous,rechargeable,multiple,metal,storage,has,potential,energy,devices,due,their,safe,usage,low,cost,capability,Nevertheless,largely,restricted,by,capacity,limited,materials,Herein,demonstrate,efficient,layered,double,hydroxide,nanosheets,arrays,abun,dant,induced,electrochemical,activation,process,Consequently,ECA,exhi,bit,Li+,Na+,Zn2+,Mg2+and,Ca2+,capacities,which,times,higher,that,unactivated,without,hierarchical,structure,respectively,Moreover,CoFe,also,shows,possibility,practical,applications,actual,batteries,By,coupling,Fe2O3,anode,assembled,delivered,density,Wh,power,voltage,range,To,our,best,knowledge,such,working,window,exceeded,other,supercapacitor,almost,comparable,than,mercial,measurable,capacitance,losses,detected,even,after,cycles,In,addition,this,provides,strategy,develop

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