期刊
JOURNAL OF POWER SOURCES
卷 385, 期 -, 页码 156-164出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.12.015
关键词
Lithium-ion battery; Overcharge; SEI layer
资金
- U.S. Department of Energy, 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), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office, Applied Battery Research
- U.S. Department of Energy [DE-AC05-00OR22725]
- U.S. Department of Energy's National Nuclear Security Administration (NNSA) [DE-NA0003525]
Cells based on nickel manganese cobalt oxide (NMC)/graphite electrodes, which contained polyvinylidene difluoride (PVDF) binders in the electrodes, were systematically charged to 100, 120, 140, 160, 180, and 250% state of charge (SOC). Characterization of the anodes by inductively-coupled-plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), and high-performance liquid chromatography coupled with electrospray ionization mass spectrometry (HPLC-ESI-MS) showed several extent-of-overcharge-dependent trends. The concentrations (by wt) of nickel, manganese, and cobalt in the negative electrode increased with SOC, but the metals remained in the same ratio as that of the positive. Electrolyte reaction products, such as LiF:LiPO3, increased with overcharge, as expected. Three organic products were found by HPLC-ESI-MS. From an analysis of the mass spectra, two of these compounds seem to be organophosphates, which were formed by the reaction of polymerized electrolyte decomposition products and PF3 or O = PF3. Their concentration tended to reach a constant ratio. The third was seen at 250% SOC only.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据