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- W2078761837 abstract "Abstract Thermal stability of LiPF 6 -based electrolyte (1 M LiPF 6 /EC + DMC) was studied by in-situ FTIR spectroscopy and C80 calorimetry, which indicated that the electrolyte underwent furious polymerization and decomposition reactions and sharp heat flow was generated below 225 °C. The thermal stability of the electrolyte in contact with various delithiated cathodes (Li x CoO 2 , Li x Ni 0.8 Co 0.15 Al 0.05 O 2 , Li x Ni 1/3 Co 1/3 Mn 1/3 O 2 , Li x Mn 2 O 4 , Li x Ni 0.5 Mn 0.5 O 2 , Li x Ni 0.5 Mn 1.5 O 4 and Li x FePO 4 ) was also investigated by C80 calorimetry. The results show that the cathode materials except for Li x FePO 4 usually have an enhancement effect on the decomposition of the electrolyte, but Li x FePO 4 exhibits a suppression effect on the reactions of the electrolyte. Li x FePO 4 is found to be with excellent thermal stability. Among the other cathodes, Li x CoO 2 , Li x Ni 0.8 Co 0.15 Al 0.05 O 2 , Li x Ni 0.5 Mn 0.5 O 2 and Li x Ni 0.5 Mn 1.5 O 4 promote the decomposition of electrolyte by releasing oxygen and thus considered not favorable for safety, but Li x Ni 1/3 Co 1/3 Mn 1/3 O 2 with a lesser reaction heat and Li x Mn 2 O 4 with even less heat flow in the low temperature range (50–225 °C) are believed as promising cathodes for better safety. By comparing X-ray diffraction (XRD) patterns of these cathode materials at room temperature and those heated to 300 °C in the presence of the electrolyte, we have found that Li x FePO 4 only has experienced tiny structure change, which is greatly different from the other cathode materials." @default.
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- W2078761837 date "2009-06-01" @default.
- W2078761837 modified "2023-10-16" @default.
- W2078761837 title "Thermal stability of LiPF6-based electrolyte and effect of contact with various delithiated cathodes of Li-ion batteries" @default.
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- W2078761837 doi "https://doi.org/10.1016/j.jpowsour.2009.02.045" @default.
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