Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/103333
Title: A study of lithium ion batteries cycle aging by thermodynamics techniques
Authors: Maher, Kenza
Yazami, Rachid
Keywords: DRNTU::Engineering::Materials::Energy materials
Issue Date: 2013
Source: Maher, K., & Yazami, R. (2014). A study of lithium ion batteries cycle aging by thermodynamics techniques. Journal of power sources, 247, 527-533.
Series/Report no.: Journal of power sources
Abstract: Lithium ion batteries (LiB) are cycled under a galvanostatic regime (∼C/2-rate) between 2.75 V and 4.2 V for up to 1000 cycles. After each completed 100 cycles, the discharge capacity, capacity loss, average discharge potential were determined under the same C/2 rate. Then cells undergo an additional charge and discharge cycle at C/6 rate followed by a thermodynamics measurements test. This enables open-circuit potential (OCP), entropy (ΔS) and enthalpy (ΔH) data to be assessed. It is found that with increasing cycle number, the entropy and enthalpy profiles show more significant changes than those observed in the discharge and the OCP curves especially at particular SOC and OCP values. These differences are attributed to the higher sensitivity of entropy and enthalpy state functions to changes in the crystal structure of the graphite anode and the lithiated cobalt oxide (LCO) induced by cycle aging compared to the free energy ΔG (OCP) alone. The thermodynamics data are supported by post-mortem X-ray diffractometry (XRD) and Raman scattering (RS) analyses on the electrode materials. The results show important LCO crystal structure degradation, whereas, surprisingly, the graphite anode remains almost unaffected by heavy cycling, if not improved.
URI: https://hdl.handle.net/10356/103333
http://hdl.handle.net/10220/24463
ISSN: 0378-7753
DOI: http://dx.doi.org/10.1016/j.jpowsour.2013.08.053
Rights: © 2013 Elsevier B.V.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles

Google ScholarTM

Check

Altmetric

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.