An Experimental Analysis on the Impacts of Different Pulse Charging Frequencies on Lithium Ion Batteries

Abstract

Lithium ion batteries can be charged by different techniques. CCCV (constant current, constant voltage) charging is the conventional method that is predominantly employed for charging the lithium ion batteries. Pulsed current charging is seen as one of the promising techniques for fast charging and high energy efficiencies.1–3 However, the impacts on the batteries due to the variations in the frequency of pulses are seldom investigated on high energy batteries. The objective of this work is to experimentally investigate the impacts of current pulses at different frequencies on commercial LTO and NMC batteries. The results of charging time, overall cycle life and efficiency are then compared with the conventional charging method. In this experiment, pulsed current profile is controlled by varying the duty cycle and amplitude to maintain the average for effective comparison with CCCV charging. Electrochemical Impedance Spectroscopy (EIS) and Scanning Electron Microscope (SEM) are used in analyzing the impacts of both the charging protocols on different lithium battery chemistries. References J. M. Amanor-Boadu, M. A. Abouzied, and E. Sanchez-Sinencio, IEEE Trans. Ind. Electron., 65, 7383–7394 (2018).M. F. Hasan, C.-F. Chen, C. E. Shaffer, and P. P. Mukherjee, J. Electrochem. Soc., 162, A1382–A1395 (2015) http://jes.ecsdl.org/cgi/doi/10.1149/2.0871507jes.H. Z. Z. Beh, G. A. Covic, and J. T. Boys, 2013 IEEE Energy Convers. Congr. Expo. ECCE 2013, 315–320 (2013).