Failure analysis of low-temperature capacity of ternary power Li-ion battery
In order to explore the low-temperature performance of power Li-ion battery,the capacity difference of two groups of A and B ternary power Li-ion batteries with the same manufacturing process but different low-temperature performance(the performance of group A is better)at low temperature(-35 ℃)is compared.A"battery-material"linkage analysis method is established to analyze the causes of low-temperature capacity failure of batteries from the microscopic characteristics of internal materials.The structure of ternary cathode material is the key factor affecting the low-temperature capacity of battery.Compared with group A,the cathode material particles of group B have looser particle-structure,cracks appeared on the surface of the particles after discharge,resulting in the loss of active Li+of the cathode materials of group B during the low-temperature discharge process,the increase of solid electrolyte interface(SEI)film impedance,the poor conductivity of the material,which leads to the failure of low-temperature capacity.
ternary power Li-ion batterylow temperaturecapacityfailure
万方数据
维普
