Studies on capacity fade of lithium-ion batteries

Characterization of high-power lithium-ion cells during constant current cycling

“…Commercial and lab-scale lithium-ion cells with graphite and metal oxide usually show two semicircles of different size at the high (or medium) and low frequency in a Nyquist plot [19][20][21][22]. The Nyquist plots of fresh and cycled cells, shown in Fig.…”

“…The charge transfer resistances, R 1 and R 2 , result from the interface resistance of both anode/electrolyte and cathode/electrolyte. Researchers have reported the growth of the surface films on the anode and the formation of defect in cathode material, but usually conclude that the cathode contributes more to the increase of overall cell impedance [20,22,24,25]. Nagasubramanian observed that the cathode contributed the most to the second semicircle from 3-electrode impedance test [18].…”

Capacity fade of Sony 18650 cells cycled at elevated temperatures

“…Zhang et al [5] using electrochemical impedance spectroscopy (EIS) studied the capacity fade of commercially available LiCoO 2 based Li-ion cells at room temperature. The results indicated that the positive electrode contributes more to the capacity fade with cycling.…”

The use of battery–capacitor combinations in photovoltaic powered products

“…In applications of Li-Ion batteries, large discharge currents will generate heat which could result in an efficiency reduction of the conversion of chemical to electrical energy. Moreover this elevated temperature will cause an increase of the internal resistance and capacity fading [4,5,6,7]. Delivering large current surges is not quite the favourite use of Li-Ion batteries.…”