期刊
JOURNAL OF POWER SOURCES
卷 251, 期 -, 页码 8-13出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.11.022
关键词
Lithium battery; Battery electrodes; Thermophysical properties; Heat capacity; Density functional theory; Lithium iron phosphate
资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy
- Office of Vehicle Technology, EERE Department of Energy
- U.S. Department of Energy's U.S.-China Clean Energy Research Center - Clean Vehicles Consortium (CERC-CVC) [DE-PI0000012]
We report heat capacity, thermogravimetry and thermal diffusivity data for carbonized mesophase pitch coated LiFePO4 (LFP) cathodes. The results are compared with the thermophysical properties of a conventional LFP-based electrode having a poly (vinylene) difluoride (PVDF) binder and conductive carbon diluents. The measured heat capacity of LFP as a function of temperature is in good agreement with model calculations based on first-principles methods. Thermal diffusivity data indicate that the mesophase pitch coated LFP compositions have a factor of two higher thermal diffusivity than the conventional electrode composition, suggesting that the coatings improve heat transfer. In the presence of an electrolyte mixture (1.2 M lithium hexa-fluorophosphate), differential scanning calorimetry (DSC) analysis of the LFP-pitch composite and LFP-PVDF-carbon composites showed similar onset temperature and heat evolution. (C) 2013 Published by Elsevier B.V.
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