A High‐Rate and Stable Quasi‐Solid‐State Zinc‐Ion Battery with Novel 2D Layered Zinc Orthovanadate Array |
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| Authors: | Dongliang Chao Changrong Zhu Ming Song Pei Liang Xiao Zhang Nguyen Huy Tiep Haofei Zhao John Wang Rongming Wang Hua Zhang Hong Jin Fan |
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| Affiliation: | 1. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore;2. Department of Material Science and Engineering, National University of Singapore, Singapore, Singapore;3. School of Chemistry and Chemical Engineering, Xuzhou University of Technology, Xuzhou, P. R. China;4. College of Optical and Electronic Technology, China Jiliang University, Hangzhou, P. R. China;5. School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore;6. Beijing Key Laboratory for Magneto‐Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology, Beijing, P. R. China |
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| Abstract: | Zinc‐ion batteries are under current research focus because of their uniqueness in low cost and high safety. However, it is still desirable to improve the rate performance by improving the Zn2+ (de)intercalation kinetics and long‐cycle stability by eliminating the dendrite formation problem. Herein, the first paradigm of a high‐rate and ultrastable flexible quasi‐solid‐state zinc‐ion battery is constructed from a novel 2D ultrathin layered zinc orthovanadate array cathode, a Zn array anode supported by a conductive porous graphene foam, and a gel electrolyte. The nanoarray structure for both electrodes assures the high rate capability and alleviates the dendrite growth. The flexible Zn‐ion battery has a depth of discharge of ≈100% for the cathode and 66% for the anode, and delivers an impressive high‐rate of 50 C (discharge in 60 s), long‐term durability of 2000 cycles at 20 C, and unprecedented energy density ≈115 Wh kg?1, together with a peak power density ≈5.1 kW kg?1 (calculation includes masses of cathode, anode, and current collectors). First principles calculations and quantitative kinetics analysis show that the high‐rate and stable properties are correlated with the 2D fast ion‐migration pathways and the introduced intercalation pseudocapacitance. |
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| Keywords: | flexible electrode layered zinc orthovanadate quasi‐solid‐state zinc array zinc‐ion batteries |
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