Experimental Confirmation of C-Rate Dependent Minima Shifts in Arrhenius Plots of Li-Ion Battery Aging

Li-ion batteries show a minimum of their aging rate at certain temperature. This in the corresponding Arrhenius plot expresses longest cycle life C-rate. By characterizing laboratory-made pouch cells and commercial 21700 as function C-rate ambient temperature, we confirm that this indeed shifts with charging Increasing C-rates lead to higher optimal temperatures respect rate. The differences between both cell types are discussed regarding specific energy anode coating thickness tested cells.