Verification of Peak Attribution in Differential Capacity Profile by Varying the Electrode Capacity Balance in Three-electrode Li-ion Laminate Cells

Abstract

Attributing the peaks in the differential capacity profile (dQ/dV vs. V) to specific electrode reactions is an essential prerequisite for investigating the degradation patterns and mechanisms in Li-ion cells using the dQ/dV vs. V curve. In our previous study, we proposed an original method for attributing the peaks in the dQ/dV vs. V curve by using a three-electrode Li-ion laminate cell with a LiCoO2 cathode, a graphite anode, and a lithium reference electrode. However, to ensure the reliability of the peak attribution results, it is necessary to verify these results using other measurement methods. Therefore, in this study, the attribution of peaks in the dQ/dV vs. V curve is confirmed by measuring and comparing the differential capacity profiles of three-electrode Li-ion laminate cells with different electrode capacity ratios.

Keywords

• dq/dv vs. v curve
• three-electrode li-ion laminate cell
• simultaneous measurement
• licoo2-graphite cell