The author of 《Temperature dependent EIS studies separating charge transfer impedance from contact impedance in lithium-ion symmetric cells》 were Keefe, A. S.; Buteau, Samuel; Hill, I. G.; Dahn, J. R.. And the article was published in Journal of the Electrochemical Society in 2019. Electric Literature of C3H2O3 The author mentioned the following in the article:
Measuring electrochem. impedance spectra of lithium-ion sym. cells at low temperatures allows for unambiguous separation of charge transfer impedance contributions from other cell impedance features. Electrodes from dry Li[Ni0.5Mn0.3Co0.2]O2 (NMC 532)/artificial graphite (AG) pouch cells were used to make blocking electrode configuration sym. cells and blocking electrode full coin cells. NMC532/AG cells with 1.2M LiPF6 in EC:DMC 3:7 (w:w) electrolyte also underwent the formation process before the electrodes were used tomake non-blocking configuration sym. and full coin cells. Through the use of temperature dependent measurements on blocking and non-blocking cells, the impedance contribution due to faradaic, charge transfer interactions can be distinguished from non-faradaic, high frequency impedance contributions. Fitting the EIS spectra allowed both the charge transfer resistances and the related capacitances to be determined for the solid electrolyte interphase layers on the neg. and pos. electrodes. The charge transfer resistances were strongly temperature dependent while the capacitances were not. The temperature dependence of the charge transfer resistance was used to determine the activation energies for lithium transport through the solid electrolyte interphase layers on the neg. and pos. electrodes. Surprisingly, the activation energies were approx. 0.6 eV for both pos. and neg. electrodes extracted from cells after formation. After reading the article, we found that the author used Vinylene carbonate(cas: 872-36-6Electric Literature of C3H2O3)
Vinylene carbonate(cas: 872-36-6) belongs to esters. Alkyl carbonates find applications as solvents for lithium ion battery electrolytes and the use of high quality battery grade electrolytes having extremely low water (<10 ppm) and acid (<10 ppm) contents are critical for achieving high electrochemical performance.Electric Literature of C3H2O3
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics