4.8 Article

Generating lithium fluoride-abundant interphase on layered lithium-rich oxide cathode with lithium 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonimide

期刊

JOURNAL OF POWER SOURCES
卷 507, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230278

关键词

Lithium ion batteries; Cathode materials; Lithium-rich oxides; Electrolyte additives; disulfonimide; Lithium 1; 1; 2; 2; 3; -hexafluoropropane-1; 3-

资金

  1. Key-Area Research and Development Program of Guangdong Province [2020B090919001]
  2. Guangdong Natural Science Foundation for Basic and Applied Basic Research [2021A1515010138]
  3. Guangdong Basic and Applied Basic Research Foundation [2019A1515111030, 2019B1515120028]
  4. China Postdoctoral Science Foundation [2020M682487]

向作者/读者索取更多资源

In this study, LiHFDF was employed as a novel electrolyte additive to generate LiF-abundant interphase on LLRO, leading to improved capacity retention and Coulombic efficiency, as well as mitigation of interfacial side reactions and voltage decay issues. This work provides an effective LiF-generating electrolyte additive for high-voltage LLROs, with potential benefits for other high-voltage cathode materials.
Layered Li-rich oxides (LLROs) attract much attention due to their high capacities. However, the electrolyte decomposition and interfacial reactions especially driven by the catalysis effect of high-valance transition metal ions under high voltage cause severe performance recession, hindering their practical applications. Lithium fluoride (LiF) is an effective component in both cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) films. In this work, lithium 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonimide (LiHFDF) is employed as a novel electrolyte additive for generating LiF-abundant interphase on LLRO. With the addition of LiHFDF, the capacity retention and Coulombic efficiency of the LLRO are improved noticeably. In addition, the interfacial side reactions and voltage decay issues are mitigated. Transmission electron microscopy and X-ray photoelectron spectroscopy measurements confirm that a compact and thin CEI film with more LiF is formed on the cathode surface for the cell using LiHFDF, which is beneficial for the enhancement of the electrochemical performance. Moreover, differential scanning calorimetry (DSC) investigations reveal that the LLRO electrode with LiHFDF has improved safety compared to that with the blank electrolyte. This work provides an effective LiF-generating electrolyte additive for high-voltage LLROs, which is believed to be positive for other high-voltage cathode materials.

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