Mechanism and kinetics characteristic of self-discharge of FeS2 cathodes for thermal batteries
| العنوان: | Mechanism and kinetics characteristic of self-discharge of FeS2 cathodes for thermal batteries |
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| المؤلفون: | Xu Zhang, Yixiu Cui, Peng Yang, Wei Chen, Xinlu Li, Wang Chao, Jianqing Liu, Xicheng Zhang, Xiaojiang Liu |
| المصدر: | Physical Chemistry Chemical Physics. 23:196-203 |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Arrhenius equation, Materials science, Kinetics, General Physics and Astronomy, Thermodynamics, 02 engineering and technology, Activation energy, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Cathode, 0104 chemical sciences, law.invention, symbols.namesake, Reaction rate constant, law, symbols, Physical and Theoretical Chemistry, 0210 nano-technology, Polarization (electrochemistry), Self-discharge, Current density |
| الوصف: | The service life of FeS2 thermal batteries is significantly affected by self-discharge of the cathode. Herein, SEM, XRD and XPS were employed to characterize the mechanism of self-discharge of the FeS2 cathode. A novel combined-discharge method, in which a tiny current (5 mA cm−2) was applied to minimize the effect of polarization on discharge capacity, was conducted to study the kinetics characteristic of self-discharge of FeS2 cathode upon discharge. Then, the self-discharge kinetics parameters which are related to the current density (20, 50 and 200 mA cm−2) and temperature (400, 450, 500 and 550 °C) were determined by the Serin–Ellickson model. Characterizations of the cells standing at 500 °C confirm that the decomposition product of the FeS2 cathode is FeS. The quantitative analysis of self-discharge rate constants (SRC) demonstrates that the reaction is a diffusion-controlling process. The kinetics process can conform to the Serin–Ellickson model. Specifically, the values of SRC increase when the cell is carried by a heavier load, since more breakage would form in FeS2 particles at the larger current density. Besides, the SRC increase at a higher temperature, and the relationship of SRC and temperature can be fitted by the Arrhenius equation. Consequently, the apparent activation energy decreases with the increase of current density. |
| تدمد: | 1463-9084 1463-9076 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::40edd7d4478a03426d1fb929b9bba578Test https://doi.org/10.1039/d0cp04576dTest |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........40edd7d4478a03426d1fb929b9bba578 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14639084 14639076 |
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