Effect of Current Rate and Prior Cycling on the Coulombic Efficiency of a Lithium-Ion Battery

Abstract

The determination of coulombic efficiency of the lithium-ion batteries can contribute to comprehend better their degradation behavior. In this research, the coulombic efficiency and capacity loss of three lithium-ion batteries at different current rates (C) were investigated. Two new battery cells were discharged and charged at 0.4 C and 0.8 C for twenty times to monitor the variations in the aging and coulombic efficiency of the battery cell. In addition, prior cycling was applied to the third battery cell which consist of charging and discharging with 0.2 C, 0.4 C, 0.6 C, and 0.8 C current rates and each of them twenty times. The coulombic efficiency of the new battery cells was compared with the cycled one. The experiments demonstrated that approximately all the charge that was stored in the battery cell was extracted out of the battery cell, even at the bigger charging and discharging currents. The average capacity loss rates for discharge and charge during 0.8 C were approximately 0.44% and 0.45% per cycle, correspondingly.

Second Life Batteries Used in Energy Storage for Frequency Containment Reserve Service

“…In Table 3 below, we present the basic technical parameters of the chosen battery cell chemistry. The table data were analyzed on the website of Battery University and from the article [40]. From the table above, the critical parameters for designing the operational strategy are the allowed voltage operation range and both C-rate values.…”

“…The resulting output power was determined by the overall energy supply efficiency of the battery system. We determined to use for academic purposes a 93% total discharge efficiency and 95% total charge efficiency regarding a discussion with colleagues from the Battery Technology Department and the results in a study by S. Madani [40]. In these percentages, we included a coulombic efficiency of 99% of the NMC battery cells as well.…”

“…Power obtained with the gradient controller increase strategy (PG preset ramp (∆ , ), which is smaller than 30 s. The amount of outpu the intraday energy market (PET) was determined by whether the 30-m case that 30 min criterion is held, the BESS has 2 h to restore the optima PET is given as half of the power of FCR provided (in our case 5 MW). was determined by the overall energy supply efficiency of the battery sy for academic purposes a 93% total discharge efficiency and 95% total c discussion with colleagues from the Battery Technology Department an Madani [40]. In these percentages, we included a coulombic efficiency cells as well.…”

Lithium-Ion Batteries: Latest Advances and Prospects

“…In response to this call, twelve research papers [19][20][21][22][23][24][25][26][27][28][29][30] and one case report [31] were thoroughly peer-reviewed and published. The published research papers covered advances in several fronts of the technology, including detailed fundamental studies of the electrochemical cell and investigations to better improve parameters related to battery packs.…”

“…An experimental investigation was performed to evaluate the effect of the current rate and prior cycling on the coulombic efficiency of LIBs [23]. The determination of coulombic efficiency of LIBs can contribute to comprehend better their degradation behavior.…”