Al-1.5Fe-xLa Alloys for Lithium-Ion Battery Package

Abstract

Al foil with high formability and corrosion resistance is highly desired for lithium-ion battery soft packaging. Annealing treatment has a significant impact on the performance of soft packaging Al foil. The effects of both La content and the annealing temperature on the microstructure, mechanical properties, and corrosion behavior of Al-1.5Fe-La alloy was investigated through optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile testing, potentiodynamic polarization testing, and electrochemical impedance spectroscopy (EIS) testing. A higher addition of La resulted in the formation of AlFeLa particles and a refinement of the Fe-rich second phase. The Al-1.5Fe-0.25La alloy had a higher formability and corrosion resistance than the Al-1.5Fe-0.1La alloy. Microstructure analysis indicated that recovery, recrystallization, and grain growth successively occurred in the Al-Fe-La alloy with the increase of the annealing temperature from 200 °C to 250 and 380 °C. After annealing at 250 °C, the Al-Fe-La alloys had the highest corrosion resistance due to refined grain and a high fraction of small-angle grain boundaries.

Tensile Properties and Corrosion Resistance of Al-xFe-La Alloys for Aluminium Current Collector of Lithium-Ion Batteries

“…Icorr characterizes the corrosion degree of alloys. The higher the Icorr is, the higher the corrosion degree of the alloy is [24]. The results in Table 2 showed that with the increase of Fe content, Icorr of Al-xFe-0.07La alloys became smaller.…”

Al–Fe–Si–La Alloys for Current Collectors of Positive Electrodes in Lithium Ion Batteries

“…The Tafel curves of the Al-xFe-0.1Si-0.07La alloys were typical Tafel curves of aluminum alloys (Figure 4). The higher the E corr was, the more difficult the alloy was to corrode [30]. The testing results shown in Table 3 indicate that the E corr of the Al-xFe-0.1Si-0.07La alloy became more positive as the Fe content increased, which indicates that the Al-xFe-0.1Si-0.07La alloy was more difficult to corrode.…”