期刊
JOURNAL OF POWER SOURCES
卷 385, 期 -, 页码 165-171出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.12.061
关键词
Lithium ion batteries; Overcharge; XPS; SEM; XRD; NMR
资金
- U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office
- DOE Office of Science by UChicago Argonne, LLC [DE-AC02-06CH11357]
- U.S. Department of Energy (DOE) [DE-AC05-000R22725]
- Office of Energy Efficiency and Renewable Energy (EERE) Vehicle Technologies Office, Applied Battery Research
- U.S. Department of Energy's National Nuclear Security Administration (NNSA) [DE-NA0003525]
1.5 Ah pouch cells based on Li(Ni0.5Mn0.3Co0.2)O-2 cathodes and graphite anodes, both containing poly (vinylidene fluoride) (PVDF) binders, were systematically overcharged to 100, 120, 140, 160, 180, and 250% state of charge (SOC), at which point they vented. The cells were subsequently discharged to 0% SOC and disassembled under an inert atmosphere for characterization. A combination of X-ray photoelectron spectroscopy (XPS), scanning-electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Li-6 SSNMR, and X-ray diffraction (XRD) analysis of the NMC532 cathodes indicates the formation of a thin C- and O-rich cathode electrolyte interphase layer, progressive Li loss above 140% SOC, and retention of the bulk crystal structure at all states of charge.
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