Abstract
To identify the mechanism of exothermic reactions of cycled FeF 3 electrodes in an electrolyte with temperature ramp-up, the structure and thermal behavior of cycled FeF 3 electrodes were investigated using a combination of XRD and DSC. The combination of XRD and DSC revealed that FeF 3 can be restored and the electrochemical was reversible even after the conversion reaction. In the discharged electrodes, a structural transformation to LiFeF 3 was observed after 1Li insertion, and two compounds (LiF and Fe metal) were formed during the conversion reaction. Accordingly, the differences of thermal behavior in the electrolyte were presented in the DSC curves. It was clear that no reaction occurred between LiF and the electrolyte at elevated temperatures. In contrast, Fe powder was found to react with the electrolyte at around 300 °C, indicating that Fe metal generated in the electrode had a direct effect on the thermal behavior of the discharged FeF 3 electrode. Moreover, Fe powder was found to react with PF 5 produced by LiPF 6 decomposition. The mixture of discharged FeF 3 electrode and electrolyte showed less heat generation than the electrolyte alone because some PF 5 was consumed by the generated Fe metal in the electrode.
| Original language | English |
|---|---|
| Pages (from-to) | 103-108 |
| Number of pages | 6 |
| Journal | Journal of Power Sources |
| Volume | 203 |
| DOIs | |
| Publication status | Published - Apr 1 2012 |
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All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering
Cite this
Mechanism on exothermic heat of FeF 3 cathode in Li-ion batteries. / Zhou, Mingjiong; Zhao, Liwei; Kitajou, Ayuko; Okada, Shigeto; Yamaki, Jun Ichi.
In: Journal of Power Sources, Vol. 203, 01.04.2012, p. 103-108.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mechanism on exothermic heat of FeF 3 cathode in Li-ion batteries
AU - Zhou, Mingjiong
AU - Zhao, Liwei
AU - Kitajou, Ayuko
AU - Okada, Shigeto
AU - Yamaki, Jun Ichi
PY - 2012/4/1
Y1 - 2012/4/1
N2 - To identify the mechanism of exothermic reactions of cycled FeF 3 electrodes in an electrolyte with temperature ramp-up, the structure and thermal behavior of cycled FeF 3 electrodes were investigated using a combination of XRD and DSC. The combination of XRD and DSC revealed that FeF 3 can be restored and the electrochemical was reversible even after the conversion reaction. In the discharged electrodes, a structural transformation to LiFeF 3 was observed after 1Li insertion, and two compounds (LiF and Fe metal) were formed during the conversion reaction. Accordingly, the differences of thermal behavior in the electrolyte were presented in the DSC curves. It was clear that no reaction occurred between LiF and the electrolyte at elevated temperatures. In contrast, Fe powder was found to react with the electrolyte at around 300 °C, indicating that Fe metal generated in the electrode had a direct effect on the thermal behavior of the discharged FeF 3 electrode. Moreover, Fe powder was found to react with PF 5 produced by LiPF 6 decomposition. The mixture of discharged FeF 3 electrode and electrolyte showed less heat generation than the electrolyte alone because some PF 5 was consumed by the generated Fe metal in the electrode.
AB - To identify the mechanism of exothermic reactions of cycled FeF 3 electrodes in an electrolyte with temperature ramp-up, the structure and thermal behavior of cycled FeF 3 electrodes were investigated using a combination of XRD and DSC. The combination of XRD and DSC revealed that FeF 3 can be restored and the electrochemical was reversible even after the conversion reaction. In the discharged electrodes, a structural transformation to LiFeF 3 was observed after 1Li insertion, and two compounds (LiF and Fe metal) were formed during the conversion reaction. Accordingly, the differences of thermal behavior in the electrolyte were presented in the DSC curves. It was clear that no reaction occurred between LiF and the electrolyte at elevated temperatures. In contrast, Fe powder was found to react with the electrolyte at around 300 °C, indicating that Fe metal generated in the electrode had a direct effect on the thermal behavior of the discharged FeF 3 electrode. Moreover, Fe powder was found to react with PF 5 produced by LiPF 6 decomposition. The mixture of discharged FeF 3 electrode and electrolyte showed less heat generation than the electrolyte alone because some PF 5 was consumed by the generated Fe metal in the electrode.
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U2 - 10.1016/j.jpowsour.2011.12.016
DO - 10.1016/j.jpowsour.2011.12.016
M3 - Article
AN - SCOPUS:84855953944
VL - 203
SP - 103
EP - 108
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -