Abstract
Al-xFe-La alloys (x = 0.07, 0.1, 0.2) for aluminum current collectors of lithium-ion batteries were prepared and the microstructure of Al-0.07Fe-0.07La, Al-0.1Fe-0.07La and Al-0.2Fe-0.07La aluminum alloys were observed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS). The experimental results showed that with the increase of Fe content, the size of the second phases in Al-xFe-0.07La alloys became finer and more dispersed and that the microstructure of the alloy had improved. The strength and corrosion resistance of Al-xFe-La alloys were studied by tensile tests and electrochemical tests and the morphological investigations of samples were also conducted by SEM and EDS. With the increase of Fe content, the strength and corrosion resistance of Al-xFe-La alloys became better. Compared to Al-0.07Fe-0.07La alloy, the yield strength and tensile strength of the Al-0.2Fe-0.07La alloy increased by 51.19% and 58.48% respectively, and the elongation increased by 88.41%. Moreover, Al-0.2Fe-0.07La alloy had much more positive corrosion potential and much smaller corrosion current than those of Al-0.07Fe-0.07La alloy.
Highlights
The lithium-ion battery has become one of the most ideal energy storage devices in the 21st century because of its high energy density, high charge-discharge efficiency, good cycling stability, wide operating temperature range, high working voltage, low self-discharge, no memory effect, its safety, and its environmentally-friendly properties
Pure aluminum foils of 1080, 1085 and 1090 grades are commonly used for the aluminum current collector materials of lithium ion batteries, but these pure aluminum foils generally have the problem of complex alloy composition [4]
Cold-rolling Al-0.07Fe-0.07La, Al-0.1Fe-0.07La and Al-0.2Fe-0.07La aluminum alloys were studied in this paper
Summary
The lithium-ion battery has become one of the most ideal energy storage devices in the 21st century because of its high energy density, high charge-discharge efficiency, good cycling stability, wide operating temperature range, high working voltage, low self-discharge, no memory effect, its safety, and its environmentally-friendly properties. Aluminum alloy foils for current collectors of lithium-ion batteries are mainly used to support the coating of active materials on cathode of lithium-ion batteries. The metallic foil is not directly helpful to the capacity of lithium-ion batteries. Tensile strength and corrosion resistance are the two main performance indexes of aluminum alloy foils for current collectors. Aluminum alloy foils with good tensile strength and corrosion resistance are the required current collector material of lithium-ion batteries [1,2,3,4]. Pure aluminum foils of 1080, 1085 and 1090 grades are commonly used for the aluminum current collector materials of lithium ion batteries, but these pure aluminum foils generally have the problem of complex alloy composition [4]
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