LAUSR

Copper is usually used as a current collector in lithium ion batteries. Its stability is highly important in the performance of cell. In this paper, temperature dependent degradation of copper current collector was investigated at -20°C, 25°C and 50°C by electrochemical measurements. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) were used to analyze the microstructures of corroded copper. At -20°C and 25°C, obvious pitting corrosion occurs on the copper due to the self-catalyst of residual water. However, at 50°C, a loose layer containing a certain amount of LiF forms on the surface of the copper and no pitting hole is observed due to the exhaustion of the aggressive fluoride ions and the residual water.