20 nm-ultra-thin fluorosiloxane interphase layer enables dendrite-free,fast-charging,and flexible aqueous zinc metal batteries  

作　　者：Yuhuan Meng Long Zhang Lequan Wang Junming Kang Hongbin Lu 

机构地区：[1]State Key Laboratory of Molecular Engineering of Polymers,Department of Macromolecular Science,Fudan University,Shanghai 200438,China [2]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Yiwu Research Institute of Fudan University,Yiwu 322000,China

出　　处：《Chinese Chemical Letters》2024年第12期550-556,共7页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22075048,52201201);Shaanxi Yanchang Petroleum Co.,Ltd.(No.18529),Yiwu Research Institute of Fudan University(No.20-1-06);the Shanghai International Collaboration Research Project(No.19520713900);the State Key Laboratory of Molecular Engineering of Polymers(Fudan University,No.K2024-36);the State Key Lab of Advanced Metals and Materials(No.2022Z-11)。

摘　　要：Dendrite growth of zinc(Zn)anode at high current density severely affects the fast-charging performance of aqueous zinc metal batteries(AZMBs).While interfacial modification strategies can optimize Zn per formance,challenges such as complicated preparation processes,excessive layer thicknesses,and high voltage hysteresis should be addressed.Herein,we utilize a cost-effective liquid fluorosiloxane,(3,3,3trifluoropropyl)trimethoxysilane,for scalable modification of Zn foil via drop-casting at room tempera ture,resulting in an ultra-thin interphase layer of only 20 nm.The Si-O-Zn bonds formed between flu orosiloxane and Zn ensure interfacial stability,and the Si-O-Si bonds between fluorosiloxane molecule help to homogenize the electric field distribution.Additionally,the abundant highly electronegative flu orine atoms on the anode surface act as zincophilic sites,promoting the uniform deposition of Zn^(2+)Thus,the modified Zn foil(SiFO-Zn)exhibits excellent dendrite suppression,reduced voltage hysteresis and prolonged cycle life at ultra-high current density(40 mA/cm^(2)),achieving a cumulative areal capac ity of 12.9 Ah/cm^(2).Further,the full cell assembled with 10μm-thick Si FO-Zn anode and MnO_(2)cathode achieves 2600 cycles at 5 A/g with minimal capacity degradation,and a large-size(22.5 cm^(-2))pouch cel powers the light-emitting diode even after reverse bending,demonstrating the potential of AZMBs fo fast-charging flexible devices.

关 键 词：SILOXANE High current density Zinc dendrite Fast-charging Flexible device 

分 类 号：TQ264.1[化学工程—有机化工] TM912[电气工程—电力电子与电力传动]