[논문]Thread like structured VO2 microspheres for improved lithium-ion storage kinetics and stability

Park, Sul Ki; Nakhanivej, Puritut; Shin, Kang Ho; Yeon, Jeong Seok; Kang, Min Su; Lee, Jin Bae; Kim, Hae Jin; Hong, Won G.; Park, Ho Seok

doi:10.1016/j.jallcom.2020.155721

[해외논문] Thread like structured VO2 microspheres for improved lithium-ion storage kinetics and stability

Journal of alloys and compounds, v.842, 2020년, pp.155721 -

Park, Sul Ki (School of Chemical Engineering, Sungkyunkwan University) , Nakhanivej, Puritut (School of Chemical Engineering, Sungkyunkwan University) , Shin, Kang Ho (School of Chemical Engineering, Sungkyunkwan University) , Yeon, Jeong Seok (School of Chemical Engineering, Sungkyunkwan University) , Kang, Min Su (School of Chemical Engineering, Sungkyunkwan University) , Lee, Jin Bae (Research Center for Materials Analysis, Korea Basic Science Institute) , Kim, Hae Jin (Research Center for Materials Analysis, Korea Basic Science Institute) , Hong, Won G. (Research Center for Materials Analysis, Korea Basic Science Institute) , Park, Ho Seok (School of Chemical Engineering, Sungkyunkwan University)

Abstract ▼ AI-Helper

Abstract Among vanadium-based materials, VO2(B), sharing octahedral VO6 structure with cavities, are considered as cathode materials due to their high capacity and multiple oxidation state. However, it has its own limitations such as low cyclic stability and sluggish charge storage kinetics arising from large structural deformation and poor electrical conductivity. In order to resolve these problems, we report a microsphere of thread like structured VO2(B) consisting of interconnected particles each other, providing continuous and facile electron and ion transport pathway. The robust internetworked microspherical structure leads to prevent the drastic volume variation during Li insertion/de-insertion process. More specifically, the as-synthesized VO2(B) displays high capacity of 225.6 mAh g−1 at 50 mA g−1 with a Columbic efficiency of 98%, high rate retention of 70% at 300 mA g−1, and good cycle stability of 72% after 350 cycles at 300 mA g−1. In addition, their structural and phase reversibility are confirmed by the in-situ XRD of VO2(B), where position of crystalline (002) peak after several electrochemical processes nearly returns on the origin position during Li insertion/de-insertion. Highlights The thread like-structured VO2(B) microsphere is synthesized via one-pot and template-free hydrothermal method. Strongly interconnected structure provides facile and stable electron and ion transport pathway. The VO2(B) microsphere exhibits enhanced rate retention and cycle stability. Structural and phase reversibility are confirmed by in-situ XRD. Graphical abstract [DISPLAY OMISSION]

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