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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

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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
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:
DateEvent
21 January 2015Published
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:
Project/Grant IDRIOXX Funder NameFunder ID
SERC/ET-0129/2012Department of Science and Technology, Government of Keralahttp://dx.doi.org/10.13039/501100006143

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