Journal of Jishou University(Natural Sciences Edition) ›› 2023, Vol. 44 ›› Issue (1): 34-43.DOI: 10.13438/j.cnki.jdzk.2023.01.006

• Computer and Electrical Technology • Previous Articles     Next Articles

Preparation of MnO2/CNTs Composites and the Electrochemical Performances as Cathode Materials for ARZIBs

YANG Ping,LIU Sijia,WAN Chaoyi,LIU Jiale,CAO Jing,JIANG Jianbo   

  1. (1.School of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan China;2.National Demonstration Center for Experimental Chemistry Education,Jishou University,Jishou 416000,Hunan China;3.Key Laboratory of Mineral Cleaner Production and Exploitation of Green Functional Materials in Hunan Province,Jishou University,Jishou 416000,Hunan China;4.Hunan 211 Collaborative Innovation Center of Manganese Zinc-Vanadium Industry Technology,Jishou 416000,Hunan China)
  • Online:2023-01-25 Published:2023-04-10

Abstract: Manganese acetate and ammonium persulfate used as raw materials,MnO2 was prepared by hydrothermal synthesis method,and then MnO2/CNTs composites was prepared by ultrasonic method.The products were characterized by X-ray diffraction,fourier transform infrared spectroscopy and scanning electron microscopy,and their electrochemical performances as cathode for AZIBs were measured by cyclic voltammetry,electrochemical impedance spectrum and galvanostatic charge-dicharge.The results showed that the product was β-MnO2 nanowires at the reaction temperature of 140 ℃ and reaction time of 22 h.The chemical structure of β-MnO2 did not change when it was compounded with CNTs.When circulated 20 times at 0.1C magnification,the first specific discharge capacity of β-MnO2/CNTs electrode in 1 mol/L ZnSO4+0.5 mol/L MnSO4 aqueous solution is 140 mAh/g.Compared with the first discharge specific capacity of β-MnO2/CNTs electrode in 1 mol/L ZnSO4 solution (45 mAh/g),the first discharge specific capacity has been increased by 2 times;and compared with the first discharge specific capacity of β-MnO2 electrode in 1 mol/L ZnSO4+ 0.5 mol/L MnSO4 aqueous solution (27 mAh/g),it has been increased by 4 times,which indicates that the composite of β-MnO2 and CNTs can improve the electrochemical performance of β-MnO2 Moreover,the electrochemical performance of β-MnO2/CNTs electrode is better in 1 mol/L ZnSO4+0.5 mol/L MnSO4 aqueous solution,but the capacity retention rate is only 50%,which indicates that the performances of the battery needs to be further improved.

Key words: MnO2/CNTs composites, aqueous zinc-ion batteries, cathode material, electrochemical performance

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