Constructing graphene conductive networks in manganese vanadate as high-performance cathode for aqueous zinc-ion batteries

• Published in: Electrochimica acta Vol. 441; p. 141856
• Main Authors: Liu, Hongwei, Wang, Nengze, Hu, Lei, Sun, Mengxuan, Li, Zhijie, Jia, Chunyang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10.02.2023
• Subjects: Aqueous zinc-ion battery; High rate-performance; Manganese doping; Reduced graphene oxide; V6O13 nanobelts; High rate-performance; Reduced graphene oxide; V6O13 nanobelts; Manganese doping; Aqueous zinc-ion battery
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2023.141856

•One-step synthesis of Mn element doped vanadium oxides with graphene conducting networks.•The MnVO@rGO ZIBs exhibit excellent specific capacity and long cycle life.•Achieved superior energy density (260.0 Wh kg-1) and power density (9113.7 W kg-1).•Dynamic and quasi-dynamic characterization and mechanistic analysis. Aqueous zinc-ion batteries (AZIBs) have been widely studied for their cheapness, safety, as well as high energy and power density. Electrode material plays a dominant role in the electrochemical properties of zinc-ion batteries. Reduced graphene oxide (rGO) can easily interact with compounds via π-π stacking for high-speed electron transport. In this study, The Mn-modified V6O13 material cathode was uniformly loaded onto the rGO conductive network. rGO can release the electron conduction process that limits the performance of the electrode material, and improves the rapid charge and discharge performance of the material. The results show that MnVO@rGO exhibits excellent energy storage properties with a high capacity of 360.3 mAh g−1 at a current density of 0.2 A g−1 in being used as the cathode material for AZIBs. More significantly, even with a current density expansion of a factor of 100, the MnVO@rGO//Zn battery still has a capacity of 88.9 mAh g−1 and a capacity retention rate of over 100% after 10,000 cycles. In addition, it has the maximal energy density of 260.0 Wh kg−1 and power density of 9113.7 W kg−1. This study provides an interesting idea for the development of electrode materials for zinc-ion batteries. The MnVO nanobelts are uniformly loaded on a conductive network composed of rGO by a simple one-step hydrothermal approach, which allows MnVO@rGO to exhibit excellent multiplicative performance and an extremely long cycle life. [Display omitted]