Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/94164
Title: | Optimizing the charging protocol to address the self-discharge issues in rechargeable alkaline Zn-Co batteries | Authors: | Shang, W Yu, W Xiao, X Ma, Y Chen, Z Ni, M Tan, P |
Issue Date: | Feb-2022 | Source: | Applied energy, Feb. 2022, v. 308, 118366 | Abstract: | Aqueous rechargeable Zn-Co batteries feature intrinsic safety and excellent electrochemical performance, and zinc metal is cheap with abundant reserves. However, a key issue, self-discharge, which may be fatal to the application, is always overlooked. Herein, the self-discharge performance is investigated systematically for the first time, and in-depth charge–discharge mechanisms are analyzed. Based on a free-standing Co3O4 electrode, the insufficient utilization of the active material is found under a conventional galvanostatic charging process. Additionally, a dramatic attenuation in the open-circuit voltage is exhibited during the delay, leading to poor capacity retention. Through electrochemical tests and ex-situ characterization, the limited capacity and the severe self-discharge behavior are ascribed to the low amount and poor stability of the high valence state, respectively. Aiming at suppressing the self-discharge behavior, a novel charging protocol is proposed based on a new mechanism, which uses a time-controlling potentiostatic charging after the galvanostatic charging process. Using this strategy, the discharge capacity increases effectively by about 31.8% from 220 to 290 mA h g−1, and the capacity retention ratio after 10 h delay lifts from 72% to 90%. More importantly, the discharge capacity remains 100% after even 2500 cycles. This work puts forward a practical method for the operation of Zn-Co batteries, addresses the limiting issues for application, and greatly facilitates the improvement of this technology. Further, the results also inspire the research of other rechargeable Zn-based batteries. | Keywords: | Charging protocol High capacity Low self-discharge rate Zn-Co batteries |
Publisher: | Pergamon Press | Journal: | Applied energy | ISSN: | 0306-2619 | EISSN: | 1872-9118 | DOI: | 10.1016/j.apenergy.2021.118366 | Rights: | © 2021 Elsevier Ltd. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Shang, W., Yu, W., Xiao, X., Ma, Y., Chen, Z., Ni, M., & Tan, P. (2022). Optimizing the charging protocol to address the self-discharge issues in rechargeable alkaline Zn-Co batteries. Applied Energy, 308, 118366 is available at https://dx.doi.org/10.1016/j.apenergy.2021.118366. |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Shang_Charging_Alkaline_Batteries.pdf | Pre-Published version | 2.04 MB | Adobe PDF | View/Open |
Page views
51
Last Week
4
4
Last month
Citations as of May 5, 2024
Downloads
9
Citations as of May 5, 2024
SCOPUSTM
Citations
12
Citations as of Apr 26, 2024
WEB OF SCIENCETM
Citations
11
Citations as of Feb 15, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.