Abstract
The first demonstration of intercalation chemistry in transition metal dichalcogenides by Prof. Whittingham inspired enthusiastic research in developing electrochemical energy storage systems (such as lithium-ion batteries) and seeking new intercalation host materials such as transition metal oxides. Among transition metal oxides, cobalt-substituted series compounds with the general formula of LiNixMnyCozO2 (NMC, x+y+z=1) have been extensively studied as high-energy cathodes; and their efficient interaction reactions have led to their successful commercialization in lithium-ion batteries. As a complement to the study to further improve intercalation chemistry and surface stability, this presentation will introduce a new methodology to fast determine degradation mechanism and lithium ion content in aged NMC cathodes, without using the coupled plasma-mass spectrometry (which involves tedious procedures and error-prone preparation). When combining with in-situ characterization and electrochemical analysis, this presentation will also discuss possible degradation mechanisms at various operation temperatures and electrochemical methods for battery performance restoration.
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