Influence of fast charging protocols on the cycle life of commercial lithium-poly batteries

The rate and shape of the charging current indubitably affect the charging time and the ageing rate of a battery. Depending on the application requirements, it is possible to use high-charging current in order to decrease the charging time. However, the influence of fast-charging current profiles should be investigated to identify their impact on battery functionality over time. The effect fast-charging current profiles on the cycle life of commercial lithium-poly batteries under different state of charge (SOC) ranges was studied using two methods[1, 2] :(1) Constant Current(CC) Charging, (2) Multistage Constant Current (MCC) Charging. Firstly, all of the batteries were charged to 4.2V and then followed by a constant voltage (CV) charging until the current declined to 0.05 C. Batteries cycled under three cycling ranges 0%-60%, 20%-80% and 40%-100% of SOC [3]. The results revealed that fast-charging MCC-CV protocol has a more important role in decreasing the degradation rate compared to the fast-charging CC-CV protocol. The battery was cycled at 0%-60% SOC perform far better than the other batteries in terms of retaining the capacity.