journal article·2020-05-26

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

ACS Nano· Volume 14· Issue 5
Publisher page

Abstract

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).
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Advanced battery technologies research · Perovskite Materials and Applications · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, P.R. China

Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States

College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, P.R. China

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

College of Physics and Information Engineering, Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang City 050024, P.R. China

College of Physics, Mechanical and Electronical College, Shijiazhuang University, Shijiazhuang City 050035, P.R. China

Funding

Ministry of Science and Technology of the People's Republic of China · Shandong Province · Hefei Institutes of Physical Science, Chinese Academy of Sciences · China Scholarship Council · Division of Chemical, Bioengineering, Environmental, and Transport Systems · Government of Jiangxi Province · Natural Science Foundation of Anhui Province · Key Laboratory of Photovoltaic and Energy Conservation, Chinese Academy of Sciences

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