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Stable and dendrite-free zn anode with artificial desolvation interface layer toward high-performance zn-ion capacitor

引用

Journal of Energy Chemistry 2022年第9期31卷 143-148,I0005页

作者： Zhe Gong Kai Jiang Pengfei Wang Xunliang Liu Dashuai Wang Ke Ye Kai Zhu Jun Yan Guiling Wang Dianxue Cao Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001HeilongjiangChina School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHong Kong 999077China Senzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina Key Laboratory of Polymer and Catalyst Synthesis Technology of Liaoning Province School of Environmental and Chemical EngineeringShenyang University of TechnologyShenyang 110870LiaoningChina

Aqueous zn-based energy storage devices possess tremendous advantages, such as low cost, high safety,and competitive energy density, due to employing a zn metal anode and aqueous electrolyte. However,the cycling stability and rate ability of a zn anode are hindered by zn dendrite growth and sluggish ion transfer in the electrode/electrolyte interface. Herein, the interfacial properties of zn anodes are improved through the introduction of a silver(Ag) protective layer, which facilitates uniform zn deposition and regulates zn ion transport. As a result, Ag-coated zn anodes display stable cycling performance(600 h at 1 m A cm^(-2)) and low overpotential(150 mV at 50 mA cm^(-2)after 2000 cycles). The Ag layer in situ electrochemically converts into an Agzn_(3) layer and promotes zn ion desolvation and threedimensional diffusion processes. Moreover, a zn-ion capacitor assembled with an Ag-coated zn anode and active carbon cathode shows a capable cycling lifespan and rate performance. This study provides a feasible strategy for constructing a stabilized and dendrite-free zn anode for the development of high-performance zn-based energy storage devices.

关键词： zn ion capacitors zn metal anodes Aqueous electrolyte Dendrite-free surface

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