Energy Storage Science and Technology ›› 2025, Vol. 14 ›› Issue (1): 42-53.doi: 10.19799/j.cnki.2095-4239.2024.0621

• Energy Storage Materials and Devices • Previous Articles     Next Articles

PANI-coated vanadium compound as high-stable aqueous zinc-ion batteries cathode material

Jie LU1(), Xian DU2, Yupu SHI2, Zhuo LI3, Na CAO3, Xuntao DU4, Huiling DU2()   

  1. 1.College of Mechanical Engineering
    2.College of Materials Science and Engineering
    3.College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China
    4.Shenzhen BYD Lithium Battery Co. , Ltd. , Kengzi Branch, Shenzhen 518122, Guangdong, China
  • Received:2024-06-21 Revised:2024-07-24 Online:2025-01-28 Published:2025-02-25
  • Contact: Huiling DU E-mail:18105016001@stu.xust.edu.cn;hldu@xust.edu.cn

Abstract:

Vanadium compounds with a variety of crystal structures have high theoretical capacity and are considered a promising positive electrode material for water-based zinc-ion batteries. However, due to the slow diffusion of zinc ions and poor structural stability, further development is limited. In this paper, Mn(VO3)2-NaV8O20 heterogeneous nanoribbons were designed and synthesized using a simple one-step hydrothermal method. A Mn(VO3)2-NaV8O20@PANI (PMNVO) composite material was then created by applying a PANI film on the nanoribbons' surface through an electrostatic self-assembly method. By combining these two strategies, the cathode material for AZIBs demonstrates efficient ion-electron cooperative transport, rapid zinc ion transport rate, excellent zinc storage performance, and a stable crystal structure. Experimental results demonstrate that the heterogeneous interface between the two crystals enhances the charge transfer kinetics of zinc, improves zinc diffusion kinetics, and the nanoribbon morphology provides more reactive sites. Additionally, when combined with PANI, the material's electrical conductivity is enhanced, and the crystal structure is more stable, resulting in PMNVO exhibiting excellent Zn storage properties and high electrochemical kinetics. Specific test results indicate that at a current density of 0.2 A/g, the specific capacity of PMNVO is 417.6 mAh/g. At 1 A/g, the initial specific capacity is 360.3 mAh/g, with a capacity retention rate of 91.0% after 200 cycles. At 8 A/g, the initial specific capacity is 189.3 mAh/g, and the capacity retention rate after 3000 cycles is 99.3%, demonstrating excellent rate performance and long cycle life. The apparent diffusion coefficient ranges from 1.87×10-10 to 4.97×10-11 cm2/s, indicating good electrochemical kinetics. This study serves as an example for the design of AZIBs cathode materials.

Key words: vanadium-based cathodes, heterogeneous structure, PANI-coated, aqueous zinc-ion battery

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