期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 169, 期 7, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac7e75
关键词
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资金
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- U.S. Department of Energy's Vehicle Technologies Office (VTO) under the Silicon Consortium Project
- U.S. Department of Energy, Office of Science, EPSCoR National Laboratory Partnership Program [DE-SC0021392]
- DOE VTO
The unstable electrode/electrolyte interface is the main cause of degradation in silicon-based anodes for lithium-ion batteries. Developing functional electrolyte additives can stabilize the dynamic Si/electrolyte interface and benefit the development of high-energy-density Li-ion batteries. Among the evaluated polymerizable electrolyte additives with different functional groups, the fluorine-containing additives show the best passivation effect on the Si electrode and enhance the performance of the full cell.
Unstable electrode/electrolyte interface is the major cause of degradation for silicon (Si)-based anodes for lithium (Li)-ion batteries. Development of functional electrolyte additives can provide a viable path toward stabilizing the dynamic Si/electrolyte interface, which will benefit the development of high energy density Li-ion batteries. Here, we evaluate polymerizable electrolyte additives with varying functional groups (fluorocarbon, thiophosphate, and fluorophosphazene). The additives are examined using LiNi0.6Mn0.2Co0.2O2/Si full cells where the cycle performance and impedance are measured. Electrochemical tests show that the fluorine-containing additives provide better passivation at the Si electrode, leading to enhanced full cell performance. Among the three additives examined, best electrochemical performance is observed from the fluorocarbon-containing compound, followed by fluorophosphazene- and thiophosphate-containing compounds. Characterization of the solid electrolyte interphase (SEI) on cycled electrodes using Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) reveal that higher concentration of fluorine and lithium oxide, and lower concentration of carbonate and organic species correlate with enhanced electrochemical performance.
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