Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/154781
Title: Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries
Authors: Chao, Dongliang
DeBlock, Ryan
Lai, Chun-Han
Wei, Qiulong
Dunn, Bruce
Fan, Hong Jin
Keywords: Science::Physics
Issue Date: 2021
Source: Chao, D., DeBlock, R., Lai, C., Wei, Q., Dunn, B. & Fan, H. J. (2021). Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries. Advanced Materials, 33(49), 2103736-. https://dx.doi.org/10.1002/adma.202103736
Project: RG157/19 
RG85/20 
Journal: Advanced Materials 
Abstract: Among the various VO2 polymorphs, the layered compound, VO2 (B), has been the most widely investigated lithium-ion battery electrode material. For sodium-ion electrodes, however, an amorphous solid may be more advantageous as a result of the open framework to facilitate ion insertion and the ability to tolerate volumetric changes. Herein, it is shown that the Na+ insertion properties of amorphous VO2 (a-VO2 ) are superior to those of crystalline VO2 (B). Amorphous VO2 exhibits a linear voltage characteristic over a 3 V range (4.0 to 1.0 V vs Na/Na+ ) leading to a reversible capacity as high as 400 mAh g-1 and rapid redox kinetics, which is attributed to its pseudocapacitive nature. The linear voltage characteristic over 3 V affords the opportunity of fabricating a symmetric Na-ion battery in which the a-VO2 material serves as both the positive electrode and the negative electrode. Such a symmetric battery offers safer operation in terms of overcharging, overdischarging, polarity reversal, high charge/discharge current abuse, and long-term usage. The results suggest that amorphous transition metal oxides may offer advantageous attributes for rapid, safe, and energy-dense storage.
URI: https://hdl.handle.net/10356/154781
ISSN: 0935-9648
DOI: 10.1002/adma.202103736
Rights: This is the peer reviewed version of the following article: Chao, D., DeBlock, R., Lai, C., Wei, Q., Dunn, B. & Fan, H. J. (2021). Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries. Advanced Materials, 33(49), 2103736-, which has been published in final form at https://doi.org/10.1002/adma.202103736. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20221216
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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