Aqueous zinc-iodine(Zn-I2)batteries are promising candidates for low-cost grid-scale energy storage systems.However,the long-term stability and energy density of the Zn-I2 batteries are largely hindered by the lack of feasible and scalable methods that coherently suppress polyiodide shuttling and Zn den-drites growth,especially at high current densities.Herein,a flexible,thin and lightweight poly(3,4-ethy lenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)nanopaper is designed as an"anion-cation reg-ulation"synergistic interlayer to tackle the above issues.The PEDOT:PSS interlayer exhibits a 3D nanofi-brous network with uniformly distributed mesopores,abundant polar groups and intrinsic conductivity,which renders an even Zn2+flux at Zn anode and facilitates homogeneous current distributions at 12 cath-ode.Meanwhile,such interlayer can act as physiochemical shield to enhance the utilization of 12 cathode via the coulombic repulsion and chemical adsorption effect against polyiodide shuttling.Thus,long-term dendrite-free Zn plating/stripping is achieved at simultaneous high current density and high areal capac-ity(550 h at 10 mA cm-2/5 mAh cm-2).Zn-12 batteries harvest a high capacity(230 mAh g-1 at 0.1 A g-1)and an ultralong lifespan(＞20000 cycles)even at 10 A g-1.This work demonstrates the potential use of the multifunctional interlayers for Zn-12 battery configuration innovation by synergistic regulation of cations and anions at the electrodes/electrolyte interface.

Ying Zhang;Tianyu Zhao;Shanchen Yang;Yaxin Zhang;Yue Ma;Zhaohui Wang

College of Materials Science and Engineering,Hunan University,Changsha 410082,Hunan,China;State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,Shaanxi,China

能源化学

[1]Ying Zhang;Tianyu Zhao;Shanchen Yang;Yaxin Zhang;Yue Ma;Zhaohui Wang-.Flexible PEDOT:PSS nanopapers as"anion-cation regulation"synergistic interlayers enabling ultra-stable aqueous zinc-iodine batteries)[J].能源化学,2022(12):310-320

nanopapers,ethy,lenedioxythiophene,nanofi,brous,Zn2+flux

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