首页|MIL-100(V)derived porous vanadium oxide/carbon microspheres with oxygen defects and intercalated water molecules as high-performance cathode for aqueous zinc ion battery

MIL-100(V)derived porous vanadium oxide/carbon microspheres with oxygen defects and intercalated water molecules as high-performance cathode for aqueous zinc ion battery

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The development of aqueous zinc ion battery cathode materials with high capacity and high magnifica-tion is still a challenge.Herein,porous vanadium oxide/carbon(p-VOx@C,mainly VO2 with a small amount of V2O3)core/shell microspheres with oxygen vacancies are facilely fabricated by using a vanadium-based metal-organic framework(MIL-100(V))as a sacrificial template.This unique structure can improve the conductivity of the VOx,accelerate electrolyte diffusion,and suppress structural collapse during circulation.Subsequently,H2O molecules are introduced into the interlayer of VOx through a highly efficient in-situ electrochemical activation process,facilitating the intercalation and diffusion of zinc ions.After the activation,an optimal sample exhibits a high specific capacity of 464.3 mA h g-1 at 0.2 A g-1 and 395.2 mA h g-1 at 10 A g-1,indicating excellent rate performance.Moreover,the optimal sample maintains a capacity retention of about 89.3％after 2500 cycles at 10 A g-1.Density functional theory calculation demonstrates that the presence of oxygen vacancies and intercalated water molecules can significantly reduce the diffusion barrier for zinc ions.In addition,it is proved that the storage of zinc ions in the cathode is achieved by reversible intercalation/extraction during the charge and discharge process through various ex-situ analysis technologies.This work demonstrates that the p-VOx@C has great potential for applications in aqueous ZIBs after electrochemical activation.

Metal-organic frameworksVanadium oxideCarbonZn-ion batteriesElectrochemical activation

Yuexin Liu、Jian Huang、Xiaoyu Li、Jiajia Li、Jinhu Yang、Kefeng Cai

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Shanghai Key Laboratory of Development and Application for Metal-Functional Materials,Key Laboratory of Advanced Civil Engineering Materials,Ministry of Education,School of Materials Science & Engineering,Tongji University,Shanghai 201804,China

State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201800,China

Research Center for Translational Medicine,East Hospital,Tongji University School of Medicine,Shanghai 200092,China

国家自然科学基金国家自然科学基金

9216311851972234

2024

10.1016/j.jechem.2023.11.029

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.90(3)
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