Aqueous rechargeable zinc-ion battery (ZIB) is considered to be a potential energy storage system for large-scale applications due to its environmental friendli-ness,high safety,and low cost.However,it remains challenging to develop suitable cathode materials with high specific capacity and long-term cyclic stability.Herein,we have fabricated freestanding Sr0.19V2O5·1.3H2O/carbon nanotubes (SrVO/CNTs) composite films with different mass ratios by incorporating SrVO into CNTs network.The synthesized SrVO possesses a large interlayer spacing of 1.31 nm,which facilitates Zn2+ diffusion.Furthermore,the SrVO/CNTs composite film with conductive network structure promotes electron transfer and ensures good contact between SrVO and CNTs during the long-term cycling process.As a result,the battery based on the SrVO/CNTs composite cathode with a mass ratio of 7∶3 delivers a specific capacity of 326 mAh·g-1 at 0.1 A·g-1 and 145 mAh·g-1 at 5 A·g-1,demonstrating a high capacity and excellent rate capability.Remarkably,the assembled ZIB shows good capacity retention of 91％ even after ultra-long cycling for 7500 cycles at a high current rate of 5 A·g-1.More importantly,the battery also delivers a high energy density and power density,as 290 Wh·kg-1 at 125 W·kg-1(0.1 A·g-1),or 115 Wh·kg-1 at 6078 W·kg-1 (5 A·g-1).The results demonstrate that the SrVO/CNTs composite is a promising cathode toward large-scale energy storage applications.

Ye-Hong Du;Xian-Yu Liu;Xin-Yu Wang;Jun-Cai Sun;Qiong-Qiong Lu;Jian-Zhi Wang;Ahmad Omar;Daria Mikhailova

Institute of Materials and Technology,Dalian Maritime University,Dalian 116026,China;School of Chemistry and Chemical Engineering,Lanzhou City University,Lanzhou 730070,China;Leibniz Institute for Solid State and Materials Research (IFW)Dresden E.V,Helmholtzstraβe 20,01069 Dresden,Germany;Key Laboratory for Green Chemical Process of Ministry of Education,School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Wuhan 430205,China

稀有金属（英文版）

[1]Ye-Hong Du;Xian-Yu Liu;Xin-Yu Wang;Jun-Cai Sun;Qiong-Qiong Lu;Jian-Zhi Wang;Ahmad Omar;Daria Mikhailova-.Freestanding strontium vanadate/carbon nanotube films for long-life aqueous zinc-ion batteries)[J].稀有金属（英文版）,2022(02):415-424

friendli,19V2O5,SrVO

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