Freestanding strontium vanadate/carbon nanotube films for long-life aqueous zinc-ion batteries

• 作者: Ye-Hong Du Xian-Yu Liu Xin-Yu Wang Jun-Cai Sun Qiong-Qiong Lu Jian-Zhi Wang Ahmad Omar Daria Mikhailova
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 415-424
• 页数: 10页
• 语种: 英文

摘要

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.