Aqueous zinc-ion batteries(ZIBs)are perceived as one of the most upcoming grid-scale storage systems.However,the issues of electrode dissolution,dendrite formation,and corrosion in traditional liquid elec-trolytes have plagued its progress.In this work,Zn dendrite growth and side reactions are effectively sup-pressed by a highly-confined tannic acid(TA)modified sodium alginate(SA)composite gel electrolyte(TA-SA).The ion-confinement effect is enhanced by divalent zinc ions coordinated with carboxyl groups and chelated with phenolic hydroxyl groups,thus guiding and regulating Zn deposition to achieve steady zinc plating/stripping behavior.As a consequence,the Zn/TA-SA/NH4V4O10 full cells deliver a high specific capacity of 238.6 mAh g-1 and maintain 94.51％over 900 cycles at 2 Ag-1.Notably,after resting over 5 d,the capacity can be stabilized with a capacity retention of 97.25％after 200 cycles at 2 A g 1.This highly-confined and hydrogen bond-strengthened gel electrolyte may provide an effective strategy for the future development of quasi-solid-state metal batteries.

School of Materials Science and Engineering,Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province,Central South University,Changsha 410083,China;College of Biological and Chemical Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;School of Physics and Electronics,Hunan University,Changsha 410083,China

[1]Bingyao Zhang;Liping Qin;Yun Fang;Yizhao Chai;Xuesong Xie;Bingan Lu;Shuquan Liang;Jiang Zhou-.Tuning Zn2+coordination tunnel by hierarchical gel electrolyte for dendrite-free zinc anode)[J].科学通报（英文版）,2022(09):955-962

Zn2+coordination

Tuning,tunnel,by,hierarchical,gel,electrolyte,dendrite,free,zinc,anode,Aqueous,batteries,ZIBs,are,perceived,one,most,upcoming,grid,scale,storage,systems,However,issues,electrode,dissolution,formation,corrosion,traditional,liquid,trolytes,have,plagued,its,progress,In,this,work,growth,side,reactions,effectively,sup,pressed,highly,confined,tannic,acid,TA,modified,sodium,alginate,SA,composite,confinement,enhanced,divalent,coordinated,carboxyl,groups,chelated,phenolic,hydroxyl,thus,guiding,regulating,deposition,achieve,steady,plating,stripping,behavior,consequence,NH4V4O10,full,cells,deliver,specific,capacity,mAh,maintain,over,cycles,Ag,Notably,after,resting,can,stabilized,retention,This,hydrogen,bond,strengthened,may,provide,strategy,future,development,quasi,solid,state,metal

0.684779