Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 15, Issue 15, Pages 5572-5581Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp50500f
Keywords
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Funding
- U.S. Department of Energy
- U.S. Department of Energy, FreedomCAR and Vehicle Technologies Office
- Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy (EERE)
- DOE [DE-AC05-06OR23100]
- Center for Electrical Energy Storage: Tailored Interfaces, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences
- Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korean government, Ministry of Knowledge and Economy [20114010203150]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20114010203150] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The stability of lithium salts, especially in the presence of reduced oxygen species, O-2 and H2O (even in a small amount), plays an important role in the cyclability and capacity of Li-O-2 cells. This combined experimental and computational study provides evidence that the stability of the electrolyte used in Li-O-2 cells strongly depends on the compatibility of lithium salts with solvent. In the case of the LiPF6-1NM(3) electrolyte, the decomposition of LiPF6 occurs in the cell as evidenced by in situ XRD, FT-IR and XPS analysis, which triggers the decomposition of 1NM3 solvent due to formation of HF from the decomposition of LiPF6. These reactions lead to degradation of the electrolyte and cause poor cyclability of the cell. The same reactions are not observed when LiTFSI and LiCF3SO3 are used as the lithium salts in 1NM3 solvent, or LiPF6 is used in TEGDME solvent.
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