Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries
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...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/154781 |
| _version_ | 1824454320601432064 |
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| author | Chao, Dongliang DeBlock, Ryan Lai, Chun-Han Wei, Qiulong Dunn, Bruce Fan, Hong Jin |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Chao, Dongliang DeBlock, Ryan Lai, Chun-Han Wei, Qiulong Dunn, Bruce Fan, Hong Jin |
| author_sort | Chao, Dongliang |
| collection | NTU |
| description | 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. |
| first_indexed | 2025-02-19T03:20:26Z |
| format | Journal Article |
| id | ntu-10356/154781 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:20:26Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1547812023-02-28T19:41:31Z Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries Chao, Dongliang DeBlock, Ryan Lai, Chun-Han Wei, Qiulong Dunn, Bruce Fan, Hong Jin School of Physical and Mathematical Sciences Science::Physics Amorphous Electrode Na-Ion Battery 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. Ministry of Education (MOE) Accepted version H.F. acknowledge the financial supported by MOE AcRF Tier 1 (RG157/19, RG85/20). 2022-01-10T04:18:36Z 2022-01-10T04:18:36Z 2021 Journal 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-. https://dx.doi.org/10.1002/adma.202103736 0935-9648 https://hdl.handle.net/10356/154781 10.1002/adma.202103736 34651351 2-s2.0-85116988595 49 33 2103736 en RG157/19 RG85/20 Advanced Materials 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. application/pdf |
| spellingShingle | Science::Physics Amorphous Electrode Na-Ion Battery Chao, Dongliang DeBlock, Ryan Lai, Chun-Han Wei, Qiulong Dunn, Bruce Fan, Hong Jin Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries |
| title | Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries |
| title_full | Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries |
| title_fullStr | Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries |
| title_full_unstemmed | Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries |
| title_short | Amorphous VO₂ : a pseudocapacitive platform for high-rate symmetric batteries |
| title_sort | amorphous vo₂ a pseudocapacitive platform for high rate symmetric batteries |
| topic | Science::Physics Amorphous Electrode Na-Ion Battery |
| url | https://hdl.handle.net/10356/154781 |
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