Compatibility of lithium salts with solvent of the non-aqueous electrolyte in Li-O2 batteries

Peng Du; Jun Lu; Kah Chun Lau; Xiangyi Luo; Javier Bareño; Xiaoyi Zhang; Yang Ren; Zhengcheng Zhang; Larry A. Curtiss; Yang-Kook Sun; Khalil Amine

doi:10.1039/c3cp50500f

Compatibility of lithium salts with solvent of the non-aqueous electrolyte in Li-O₂ batteries

Peng Du, Jun Lu, Kah Chun Lau, Xiangyi Luo, Javier Bareño, Xiaoyi Zhang, Yang Ren, Zhengcheng Zhang, Larry A. Curtiss, Yang-Kook Sun, Khalil Amine

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

71 Citations (Scopus)

Abstract

The stability of lithium salts, especially in the presence of reduced oxygen species, O₂ and H₂O (even in a small amount), plays an important role in the cyclability and capacity of Li-O₂ cells. This combined experimental and computational study provides evidence that the stability of the electrolyte used in Li-O₂ cells strongly depends on the compatibility of lithium salts with solvent. In the case of the LiPF ₆-1NM3 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. © 2013 the Owner Societies.

Original language	English
Pages (from-to)	5572-5581
Journal	Physical Chemistry Chemical Physics
Volume	15
Issue number	15
DOIs	https://doi.org/10.1039/c3cp50500f
Publication status	Published - 21 Apr 2013
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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title = "Compatibility of lithium salts with solvent of the non-aqueous electrolyte in Li-O2 batteries",

abstract = "The stability of lithium salts, especially in the presence of reduced oxygen species, O2 and H2O (even in a small amount), plays an important role in the cyclability and capacity of Li-O2 cells. This combined experimental and computational study provides evidence that the stability of the electrolyte used in Li-O2 cells strongly depends on the compatibility of lithium salts with solvent. In the case of the LiPF 6-1NM3 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. {\textcopyright} 2013 the Owner Societies.",

author = "Peng Du and Jun Lu and Lau, {Kah Chun} and Xiangyi Luo and Javier Bare{\~n}o and Xiaoyi Zhang and Yang Ren and Zhengcheng Zhang and Curtiss, {Larry A.} and Yang-Kook Sun and Khalil Amine",

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TY - JOUR

T1 - Compatibility of lithium salts with solvent of the non-aqueous electrolyte in Li-O2 batteries

AU - Du, Peng

AU - Lu, Jun

AU - Lau, Kah Chun

AU - Luo, Xiangyi

AU - Bareño, Javier

AU - Zhang, Xiaoyi

AU - Ren, Yang

AU - Zhang, Zhengcheng

AU - Curtiss, Larry A.

AU - Sun, Yang-Kook

AU - Amine, Khalil

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2013/4/21

Y1 - 2013/4/21

N2 - The stability of lithium salts, especially in the presence of reduced oxygen species, O2 and H2O (even in a small amount), plays an important role in the cyclability and capacity of Li-O2 cells. This combined experimental and computational study provides evidence that the stability of the electrolyte used in Li-O2 cells strongly depends on the compatibility of lithium salts with solvent. In the case of the LiPF 6-1NM3 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. © 2013 the Owner Societies.

AB - The stability of lithium salts, especially in the presence of reduced oxygen species, O2 and H2O (even in a small amount), plays an important role in the cyclability and capacity of Li-O2 cells. This combined experimental and computational study provides evidence that the stability of the electrolyte used in Li-O2 cells strongly depends on the compatibility of lithium salts with solvent. In the case of the LiPF 6-1NM3 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. © 2013 the Owner Societies.

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DO - 10.1039/c3cp50500f

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