What is the reason why lithium-ion battery is poor?

作者：Iflowpower – Kaasaskantava elektrijaama tarnija

1. The viscosity of the electrolyte at low temperature increases, the conductivity is lowered; 2. The electrolyte / electrode interface mask impedance and charge transfer impedance are increased; 3.

The migration rate of lithium ions in the active material body is lowered. This causes low temperatures Electrode polarization is intensified, and the charge and discharge capacity is reduced. In general, the factors affecting battery high temperature, low temperature can be summarized as: electrolyte electrical conductivity, interface impedance, SEI film, etc.

, these factors are integrated, affecting the performance of the battery. In addition, during low temperature charging, the negative electrode will occur, and the negative electrode exhibits a lithium metal precipitation, the deposition of metal lithium is not reversible to consume a large amount of electrolyte, and the thickness of the SEI film is further added, resulting in The impedance of the battery negative surface film is further increased, and the battery polarization is reinforced, and it will greatly destroy the low temperature performance, cycle life and safety performance of the battery.