Mitigating the dissolution of V2O5 in aqueous ZnSO4 electrolyte through Ti-doping for zinc storage

• Published in: Chinese chemical letters Vol. 35; no. 1; pp. 108421 - 562
• Main Authors: Wei, Zihe, Wang, Xuehua, Zhu, Ting, Hu, Ping, Mai, Liqiang, Zhou, Liang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2024; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China; School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China%School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China%State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China%State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China; Hubei Longzhong Laboratory,Wuhan University of Technology(Xiangyang Demonstration Zone),Xiangyang 441000,China; Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Xianhu Hydrogen Valley,Foshan 528200,China%Hubei Longzhong Laboratory,Wuhan University of Technology(Xiangyang Demonstration Zone),Xiangyang 441000,China; Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Xianhu Hydrogen Valley,Foshan 528200,China
• Subjects: Aqueous zinc-ion batteries; Aqueous ZnSO4 electrolyte; Ti doping; V2O5 cathode materials; Yolk-shell structure; Aqueous ZnSO4 electrolyte; Aqueous zinc-ion batteries; Ti doping; Yolk-shell structure; V2O5 cathode materials
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2023.108421

Aqueous zinc-ion batteries (AZIBs) have become a hotspot for electrochemical energy storage owing to the high safety, low cost, environmental friendliness, and favourable rate performance. However, the serious dissolution of cathode materials in aqueous electrolytes would lead to poor cyclability, which should be addressed before commercialization. Herein, we designed a Ti-doped V2O5 with yolk-shell microspherical structure for AZIBs. The Ti doping stabilizes the crystal structure and relieves the dissolution of V2O5 in aqueous ZnSO4 electrolyte. The optimized sample, Ti0.2V1.8O4.9, delivers a high capacity (355 mAh/g at 0.05 A/g) as well as good capacity retention (89% after 2500 cycles at 1.0 A/g). This work provides an effective strategy to mitigate the dissolution of cathode material in aqueous ZnSO4 electrolyte for cyclability enhancement. [Display omitted] Ti-doped V2O5 yolk-shell microspheres are synthesized by a spray drying method, and the optimized Ti0.2V1.8O4.9 delivers a high capacity and improved cyclability in low cost aqueous ZnSO4 electrolyte. This study provides an effective strategy to mitigate the dissolution issue of cathode material in aqueous electrolytes by transition metal doping.