A Study on the Cycle Life of Lithium-Ion Batteries Using In Situ 7Li Solid-State Nuclear Magnetic Resonance. Issue 6 (25th March 2016)

• Record Type: Journal Article
• Authors: Arai, J.; Nakahigashi, R.; Sugiyama, T.
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 6(2016)
• Page Start: A1064
• Page End: A1069
• Publication Date: 2016-03-25
• Subjects: 7Li NMR -- capacity fade -- cycle life -- in situ NMR -- Lithium ion battery; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0051607jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The capacity fading of lithium ion batteries (LIBs) is investigated, using in situ 7 Li solid-state nuclear magnetic resonance (NMR). LIB cells consisting of graphite or hard carbon and LiCoO2 are used and cycled under two different temperatures (10 and 25°C) and charge current rates (0.5 and 1 C). The cell capacity and the amount of Li stored in carbon are measured with a battery cycler and in situ 7 Li solid-state NMR measurements before the beginning of the test and after every 100 test cycles. The in situ 7 Li solid state NMRs provide sufficient information throughout the cycle tests to characterize all test conditions. The cell capacities are analyzed in terms of the 7 Li NMR peak intensity, attributed to Li stored in carbon. This intensity shows affine proportionality with the cell capacity for every evaluation, with an additive constant that decreases with the increase in cell capacity fading. This may be related to the loss of Li storage caused by voltage "slippage."