Fig. 1. Potential profiles of natural graphite (NG-7) in 1 M LiClO4/ (a) EC+DEC (1:1, vol. ratio) and (b) PC at low temperature (-15°C). C-rate: 0.1 C. The inset is a magnified view of the potential profile.
Fig. 2. Potential profiles of natural graphite (NG-7) in PCbased electrolyte solutions containing 1 M (a) LiPF6, (b) LiBF4, and (c) LiCF3SO3 at low temperature (-15°C). Crate: 0.1 C. The inset is a magnified view of the potential profile.
Fig. 3. Potential profiles of natural graphite (NG-7) in PCbased electrolyte solutions containing 1 M (a) LiPF6, (b) LiBF4, and (c) LiCF3SO3 at room temperature (25°C) after five cycles at -15°C. C-rate: 0.1 C. The inset is a magnified view of the potential profile.
Fig. 4. Raman spectra of the PC-based electrolyte solutions containing 1 M (a) LiPF6, (b) LiBF4, and (c) LiCF3SO3 at 25 and -15°C.
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