Effect of rate on the thermal safety of lithium titanate anode Li-ion battery
Lithium titanate(Li4Ti5O12)anode Li-ion battery has good rate capability,long cycle life,and high safety,but incidents related to thermal runaway still occur.To investigate the impact of the rate on thermal safety performance of battery,cylindrical LiNi0.5Co0.2 Mn0.3O2/Li4Ti5O12 Li-ion battery is selected as the subject.Different charge and discharge rates are employed for cycling and thermal runaway experiments,data analysis is conducted on capacity-voltage,discharge direct current internal resistance and thermal runaway temperature variations of the batteries.High-rate cycle leads to the loss of cathode active material of the battery,resulting in a decline in both the cycle performance and thermal safety.A negative correlation has been observed between the thermal safety of batteries and the rate:when the rate of the battery increases from 2.00 C to 8.00 C,the triggering temperature for thermal runaway decreases from 358.5℃to 254.1℃.The duration time of thermal runaway shortens from 3 608 s to 2 980 s,while the maximum temperature rise rate increases from 34.2℃/s to 59.7℃/s during thermal runaway.
万方数据
维普
