期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 123, 期 16, 页码 10325-10332出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b11549
关键词
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资金
- National Natural Science Foundation of China (NSFC)
- Deutsche Forschungsgemeinschaft (DFG) [EN 370/28-1]
- National Natural Science Foundation of China [51761135123]
The solid electrolyte interphase (SEI) plays an important role in the performance of a Li-ion battery. A detailed insight into the chemical reactions between the electrolyte and lithium at the electrode/electrolyte interphase is thus of great interest. In the present paper, two different sequences of stepwise nanometer-thick depositions of the ionic liquid 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide ([EMIm]FSI) and of lithium bis(fluorosulfonyl)imide (LiFSI) on Li-intercalated highly oriented pyrolytic graphite were employed to examine the decomposition products of [EMIm](+) cations and FSI- anions and their dependence on layer thicknesses and annealing temperature by X-ray photoelectron spectroscopy. The results indicate that the interaction of an IL adlayer with lithiated graphite leads to a stable passivation layer, which inhibits the deintercalation of Li. The passivation layer is composed of the decomposed products from both the [EMIrn](+) cation and the FSI- anion, such as methyl-, ethyl-imidazole, LiF, Li2O, LiNSO2, and LiSO2F. Our work can provide valuable information about designing a suitable electrolyte to get a stable SEI layer for battery applications.
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