Float Current Analysis for Fast Calendar Aging Assessment of 18650 Li(NiCoAl)O2/Graphite Cells

Float currents are steady-state self-discharge after a transient phase—caused by anode overhang, polarization, etc.—is accomplished. The float current is measured in this study with standard test bench for five 18650 cells (Samsung 25R) at potentiostatic conditions while the temperature changed 5 K steps from °C to 60 °C. entire performed about 100 days resulting 12 measurement points per cell potential an Arrhenius representation. follows law activation energy of kJ/mol. capacity loss reference condition shows high correlation results analysis. In contrast classical calendar aging tests, analysis enables determining rate precision down least 10 Returning higher temperatures 30 reducing increasing that may originate hysteresis effect has be investigated future publications.