Dedetemo Kimilita Patrick, Museba Hugues Nkomba, Kongoda Lisika Louis, Kazadi Mukenga Bantu Albert
Nanostructured & Energy Conversion Materials Group, Department of Physics and Technology, Faculty of Sciences and Technologies, University of Kinshasa, Kinshasa XI, Kinshasa B.P 190, Democratic Republic of the Congo.
General Graduate School, Department of Computer Science and Electrical Engineering, Handong Global University, 558 Handong-ro Buk-gu, Pohang, Gyeongbuk 37554, Republic of Korea.
ACS Omega. 2025 Jan 23;10(4):4121-4131. doi: 10.1021/acsomega.4c10671. eCollection 2025 Feb 4.
Vanadium-based cathode materials have attracted significant interest owing to their high theoretical capacities (>300 mA h g), versatile electrochemical ion insertions, and high valence states. However, their poor electrical conductivities and dissolution in electrolytes have hindered the development of grid energy storage systems. To address these issues, Cu ion-doped VO·HO (CuVO-2) cathode materials prepared via a one-step hydrothermal method were used to solve the aforementioned problems. The as-prepared CuVO-2 offered ample space for rapid ion transport, enabling a high reversible capacity of 444.8 mA h g at 0.1 A g, excellent rechargeability of up to 5000 cycles at 5 A g with a Coulombic efficiency (CE) of 84.4%, and an acceptable energy density of 302.65 W h kg. To better understand the storage mechanism of CuVO-2, several characterizations were conducted, including ex situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), which helped elucidate the intercalation mechanism of the developed cathode materials. These findings offer valuable insights into the design of stable V-based cathode materials for next-generation aqueous zinc-ion batteries (AZIBs).
钒基正极材料因其高理论容量（>300 mA h g）、多样的电化学离子插入过程和高化合价态而备受关注。然而，其较差的电导率以及在电解质中的溶解性阻碍了电网储能系统的发展。为解决这些问题，采用一步水热法制备的铜离子掺杂VO·HO（CuVO-2）正极材料来解决上述问题。所制备的CuVO-2为快速离子传输提供了充足空间，在0.1 A g下具有444.8 mA h g的高可逆容量，在5 A g下具有高达5000次循环的优异可充电性，库仑效率（CE）为84.4%，以及302.65 W h kg的可接受能量密度。为更好地理解CuVO-2的存储机制，进行了包括非原位X射线衍射（XRD）和X射线光电子能谱（XPS）在内的多种表征，这有助于阐明所开发正极材料的嵌入机制。这些发现为下一代水系锌离子电池（AZIBs）稳定的钒基正极材料设计提供了有价值的见解。
