Carbon black/electrolyte interface study by electromagnetic and electrochemical techniques in γAl2O3/poly(vinylidene fluoride)/carbon black composite materials: Application for lithium-ion batteries

This work aims at better understanding the interactions existing between liquid electrolyte and solid composite electrode in a Li-ion battery. We substituted common active material (e.g. LiNi1/3Mn1/3Co1/3O2 or LiFePO4) by an insulating (inactive) γ-Al2O3 compound order to detect evidence interaction carbon black electronic additive electrolyte. Our study presents characterization of charge (electrons ions) transport different scales combining high-frequency analysis performed broadband dielectric spectroscopy (BDS, up 1010 Hz), along with low-frequency electrochemical impedance (EIS, down 10−3 Hz). Two materials two specific surface areas (80 m2.g−1 65 m2.g−1, respectively) were studied. The percolation threshold kinetics impregnation hierarchical have been determined respect content. significant influence adsorbtion ions on electrons is particularly highlighted explained.