INVESTIGADORES
FLEXER Victoria
artículos
Título:
Pulsed Charging Protocols with Non-Zero Relaxation Time for Lithium-Ion Batteries
Autor/es:
ACOSTA, LAUTARO N.; GARAVENTTA, GUILLERMO; LEVI, MIKHAEL; AURBACH, DORON; FLEXER, VICTORIA
Revista:
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Editorial:
ELECTROCHEMICAL SOC INC
Referencias:
Año: 2022 vol. 169
ISSN:
0013-4651
Resumen:
Lithium-ion batteries are commonly charged following the constant current -constant voltage (CC-CV) protocol. Current flow during charging implies an equivalent ionic flow through the battery materials. Intercalation and de-intercalation of Li+ are accompanied by concentration gradients that are reflected by the rise in the cells´ potentials that is required to maintain the constant current during the CC regime. In this work, two new pulsed charging protocols were tested. Firstly, a square current pulse is applied to the cell until the cut-off voltage is reached, followed by a pulsed square voltage protocol (PV). The second methodology keeps the same current pulse, however, after the limiting voltage was reached, the pulsing regime consisted in alternating between a maximum voltage value and a minimum, non-zero, constant current value. Different voltage pulse widths and frequencies were tested, in order to study the maximum electrodes´ capacity, the time required to reach that capacity, the contribution of each individual step (i.e. PC and PV) to the total electrodes´ capacity, and the thermal variations for each. The second pulsing mode produced capacity values 7%–8% higher than in the classical CC–CV protocol, and in charging times periods from 5%–25% faster, without