Dual modulation of homogeneous nanomaterialization and electrochemical activation enhancing zinc ion storage  

作　　者：Jianwei Wang Huan Wang Kangning Wang Wenhui Wang Wenlin Zhang Yanzhong Zhen 

机构地区：[1]School of Chemistry&Chemical Engineering,Yan’an University,Yan’an 716000,China

出　　处：《Science China Chemistry》2025年第1期385-393,共9页中国科学(化学英文版)

基　　金：supported by the National Natural Science Foundation of China(22269024,22068037);the Key Research and Development Program of Shaanxi Province(2024GX-YBXM-439,2021GY-166);the Ph.D.Research Startup Foundation of Yan’an University(YDBK202022,YDBK2018-06);the Major Research and Development Project of Central Government Guides Local Science and Technology Development Professional Technology Innovation Platform(2019ZY-CXPT-08)。

摘　　要：Vanadium-based electrode materials are widely investigated,but the low specific capacity and slow electrochemical kinetics in aqueous zinc-ion batteries still limit their commercial development.Herein,the VS_(2)/Ca V_(4)O_(9)material with the morphology of nanoflower was synthesized by a one-step hydrothermal method.Compared to the blocky structure of pure VS_(2)material,the VS_(2)/Ca V_(4)O_(9)material is composed of thinner homogeneous nanosheets.The open structures could provide abundant electrochemical active sites and ion transport channels,and then promote the electrochemical reaction kinetics.In addition,they can also buffer the bulk strain during the reaction process.To improve the utilization of vanadium elements,an in-situ electrochemical activation strategy is used to explore the storage performance of the VS_(2)/Ca V_(4)O_(9)material,the different activation voltage range of 0.4–1.6 and 0.4–1.4 V are selected,respectively.Compared with the longer activation plateau of activated-VS_(2),the VS_(2)/Ca V_(4)O_(9)cathode could quickly reach the activation state in the range of 1.4–1.6 V and cause the release of additional Zn storage sites simultaneously.The VS_(2)/Ca V_(4)O_(9)cathode delivers a higher power density of 37,000 W kg^(-1)and a significant energy density of 423 Wh kg^(-1).At the high current density of 15 A g^(-1),the VS_(2)/Ca V_(4)O_(9)cathode still has a discharge capacity of 183.9m Ah g^(-1)after 5,000 cycles,and the capacity decay rate per cycle is only 0.0042%.Continuous cyclic voltammetry(CV)curves,electrochemical impedance spectroscopy(EIS)measurements,density functional theory(DFT)calculation and galvanostatic intermittent titration technique(GITT)measurements demonstrate that the VS_(2)/Ca V_(4)O_(9)cathode has a faster ion diffusion/charge transfer kinetics.Meanwhile,the assembled flexible device has an excellent mechanical stability.

关 键 词：dual modulation homogeneous nanomaterialization electrochemical activation zinc ion storage 

分 类 号：TG1[金属学及工艺—金属学]