Ultra-High Mass-Loading Cathode for Aqueous Zinc-Ion Battery Based on Graphene-Wrapped Aluminum Vanadate Nanobelts

• Published in: Nano-micro letters 2019-08, Vol.11 (1), p.69-12, Article 69
• Main Authors: Zhang, Wenyu, Liang, Shuquan, Fang, Guozhao, Yang, Yongqiang, Zhou, Jiang
• Format: Article
• Language: English
• Subjects: Aluminum; Aluminum vanadate; Aqueous electrolytes; Aqueous zinc-ion battery; Cathode; Cathodes; Cathodic dissolution; Cycles; Diffusion layers; Dissolution; Electrode materials; Electrodes; Electrolytes; Engineering; Graphene; High mass loading; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Organic chemistry; Rechargeable batteries; Stability; Zinc
• ISSN: 2311-6706; 2150-5551
• DOI: 10.1007/s40820-019-0300-2

Highlights We first report on H 11 Al 2 V 6 O 23.2 with large layer spacing as cathode for aqueous zinc-ion battery, which accelerates the diffusion of Zn 2+ . The graphene-wrapped H 11 Al 2 V 6 O 23.2 nanobelts can improve electronic conductivity, and potentially inhibit the dissolution of elements in the aqueous electrolyte. H 11 Al 2 V 6 O 23.2 @graphene exhibits high capacity and stable cycling stability even at an ultra-high mass loading of ~ 15.7 mg cm −2 . Rechargeable aqueous zinc-ion batteries (AZIBs) have their unique advantages of cost efficiency, high safety, and environmental friendliness. However, challenges facing the cathode materials include whether they can remain chemically stable in aqueous electrolyte and provide a robust structure for the storage of Zn 2+ . Here, we report on H 11 Al 2 V 6 O 23.2 @graphene (HAVO@G) with exceptionally large layer spacing of (001) plane (13.36 Å). The graphene-wrapped structure can keep the structure stable during discharge/charge process, thereby promoting the inhibition of the dissolution of elements in the aqueous electrolyte. While used as cathode for AZIBs, HAVO@G electrode delivers ideal rate performance (reversible capacity of 305.4, 276.6, 230.0, 201.7, 180.6 mAh g −1 at current densities between 1 and 10 A g −1 ). Remarkably, the electrode exhibits excellent and stable cycling stability even at a high loading mass of ~ 15.7 mg cm −2 , with an ideal reversible capacity of 131.7 mAh g −1 after 400 cycles at 2 A g −1 .