Thermophysical properties of LiFePO4 cathodes with carbonized pitch coatings and organic binders: Experiments and first-principles modeling

Nanda, J and Martha, S K and Porter, W D and Wang, H and Dudney, N J and Radin, M D and Siegel, D J (2014) Thermophysical properties of LiFePO4 cathodes with carbonized pitch coatings and organic binders: Experiments and first-principles modeling. Journal of Power Sources, 251 (1). pp. 8-13. ISSN 0378-7753

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Abstract

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

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