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Impacts of Oxygen Vacancies on Zinc Ion Intercalation in VO2
Zhaoqian Li; Yingke Ren; Lie Mo; Chaofeng Liu; Kevin Hsu; Youcai Ding; Xianxi Zhang; Xiuling Li; Linhua Hu; Denghui Ji; Guozhong Cao
Source PublicationACS Nano

The aqueous zinc ion battery has emerged as a promising alternative technology for large-scale energy storage due to its low cost, natural abundance, and high safety features. However, the sluggish kinetics stemming from the strong electrostatic interaction of divalent zinc ions in the host crystal structure is one of challenges for highly efficient energy storage. Oxygen vacancies (VO••), in the present work, lead to a larger tunnel structure along the b axis, which improves the reactive kinetics and enhances Zn-ion storage capability in VO2 (B) cathode. DFT calculations further support that VO •• in VO2 (B) result in a narrower bandgap and lower Zn ion diffusion energy barrier compared to those of pristine VO2 (B). VO••-rich VO2 (B) achieves a specific capacity of 375 mAh g−1 at a
current density of 100 mA g−1 and long-term cyclic stability with retained specific capacity of 175 mAh g−1 at 5 A g−1 over 2000 cycles (85% capacity retention), higher than that of VO2 (B) nanobelts (280 mAh g−1 at 100 mA g−1 and 120 mAh g−1 at 5 A g−1, 65% capacity retention).

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Corresponding AuthorLinhua Hu; Denghui Ji; Guozhong Cao
Affiliation1.Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences
2.College of Science, Hebei University of Science and Technology
3.Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
4.College of Physics, Mechanical and Electronical College, Shijiazhuang University, Shijiazhuang City 050035, P.R. China
5.College of Physics and Information Engineering, Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang City 050024, P.R. China
6.Shandong Provincial Key Laboratory/ Collaborative Innovation Center of Chemical Energy Storage & Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, P.R. China
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GB/T 7714
Zhaoqian Li,Yingke Ren,Lie Mo,et al. Impacts of Oxygen Vacancies on Zinc Ion Intercalation in VO2[J]. ACS Nano,2020.
APA Zhaoqian Li.,Yingke Ren.,Lie Mo.,Chaofeng Liu.,Kevin Hsu.,...&Guozhong Cao.(2020).Impacts of Oxygen Vacancies on Zinc Ion Intercalation in VO2.ACS Nano.
MLA Zhaoqian Li,et al."Impacts of Oxygen Vacancies on Zinc Ion Intercalation in VO2".ACS Nano (2020).
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