Reversible heat effects of lithium metal- and porous lithium iron phosphate electrodes

Effect of the Ion, Solvent, and Thermal Interaction Coefficients on Battery Voltage

“…A contribution to the relaxation from phase-change phenomena in the electrode has also been suggested. 39 For our purpose, to compute the thermal polarization, we conclude that the Soret coefficient or the heat of transfer in the present case is so small that it has a negligible impact on the gradients in chemical potential and Table 7. Heat Flux and Gradients in Mole Fraction (x i ) from the NEMD Simulations.…”

“…Figure b. See ref for more details. The electric potential difference was measured as a function of the temperature difference between the copper plates, , see Figure c,d.…”

“…The slope that we derived from three measurements gave the value 1.15(20) mV K −1 at 300 K for the 1 M LiPF 6 in 1:1 (vol) EC/DEC electrolyte. The Seebeck coefficient with the 1:1 wt % EC/ DMC electrolyte was determined to 1.1(1) mV K −1 at 300 K based on 14 measurements, 39 equal to the DEC-containing electrolyte within experimental uncertainty. This value translates into a Peltier heat of 300 K × 1.15 × 10 −3 × 1 × 10 5 V C K mol = −34.5 kJ mol −1 .…”

“…The difference in the initial and stationary state values of the Seebeck coefficient was here smaller than the experimental uncertainty; therefore, no value could be extracted from the experimental data. A contribution to the relaxation from phase-change phenomena in the electrode has also been suggested . For our purpose, to compute the thermal polarization, we conclude that the Soret coefficient or the heat of transfer in the present case is so small that it has a negligible impact on the gradients in chemical potential and therefore on the thermal polarization.…”

“…The ratio of the two differences was 0.66 ± 0.06. 39 ■ ASSOCIATED CONTENT * sı Supporting Information…”