(Invited) Effect of Aging on Mechanical Properties of Lithium Ion Cell Components. (7th July 2017)

• Record Type: Journal Article
• Authors: Wu, Zenan; Cao, Lei; Hartig, Julia; Santhanagopalan, Shriram
• Is Part Of: ECS transactions. Volume 77:Number 11(2017)
• Page Start: 199
• Page End: 208
• Publication Date: 2017-07-07
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/07711.0199ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : The mechanical properties of aged and fresh lithium ion cell components are evaluated in this paper. Cells components were obtained from destructive physical analysis of 40Ah NMC/Graphite-based pouch cells before and after cycling and were subjected to mechanical testing. The aging tests comprised of cycling the cell across a voltage window of 4.1V to 3.0V at room temperature (25℃). Using a 2C charging rate and 1C discharging rate, the cells were subjected to over 5600 cycles before a 80% drop in the name-plate capacity was observed. Mechanical tests, including compression test, tensile test and indentation test, were conducted on the cell components to investigate differences in the mechanical performance. Comparison of the fresh and aged cells components shows that cycling the cells has different degrees of impact on the different cell components. Anodes suffered the most serious deterioration in mechanical properties while separators remained intact under the test condition investigated.