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Effect of relaxation periods over cycling performance of a Li-ion battery
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Rashid, Muhammad and Gupta, Amit (2015) Effect of relaxation periods over cycling performance of a Li-ion battery. Journal of The Electrochemical Society, 162 (2). A3145-A3153. doi:10.1149/2.0201502jes
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Official URL: http://dx.doi.org/10.1149/2.0201502jes
Abstract
Various operational parameters such as charge/discharge rates, relaxation periods, and depth of charge and discharge play an important role in enhancing the cycling life of Li-ion batteries. Providing batteries with a relaxation period after discharging and charging might be essential for removing concentration gradients generated due to passage of current. In the present work, the effect of providing open-circuit time durations after completion of each charge and discharge over the performance of Li-ion cells has been analyzed and quantified. It is shown that relaxing the cell after discharge has significant influence over cell performance, whereas relaxation after charge has a marginal effect. In the former case, a relatively thicker film forms at the solid-electrolyte interface in the negative electrode. Moreover, providing a sufficiently long relaxation to the cell at the end of discharge results in (a) a higher concentration of lithium in the solid matrix of the negative electrode and (b) a lower concentration of lithium in the positive electrode, both leading to a higher cell potential during the discharge phase of the subsequent cycle. Charging the cell following a relaxation period of more than one hour at the end of discharge results in a better utilization of cyclable lithium.
| Item Type: | Journal Article | ||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| Library of Congress Subject Headings (LCSH): | Lithium ion batteries., Lithium cells. | ||||||
| Journal or Publication Title: | Journal of The Electrochemical Society | ||||||
| Publisher: | Electrochemical Society, Inc. | ||||||
| ISSN: | 0013-4651 | ||||||
| Official Date: | 21 January 2015 | ||||||
| Dates: |
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| Volume: | 162 | ||||||
| Number: | 2 | ||||||
| Page Range: | A3145-A3153 | ||||||
| DOI: | 10.1149/2.0201502jes | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access | ||||||
| RIOXX Funder/Project Grant: |
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