Study on the Charging Behaviors of Lithium-Ion Batteries by Analysis of Li Distribution in the Electrode Particles

Abstract

The lithium-ion battery is considered to be one of the most attractive energy storage systems for electric vehicles (EVs), and the fast charging technology is a basic requirement for the popularity of EVs. This paper investigates the influences of the current and temperature on the charging behaviors based on the analysis of the Li concentration distributions inside the electrode particles. The constant current (CC)-constant voltage (CV) mode is adopted. The results show that the chargeable capacity in the CC stage decreases as the charging current increases from 0.5C to 4C, whereas it changes slightly as the current larger than 4C; the CC charging time is approximately inversely proportional to the charging current, whereas the CV charging time changes slightly as the charging current increases. For application of EVs, the battery is recommended to only charge 90% of the total capacity, which can greatly shorten the charging time.