Abstract
Al–xFe–Si–La alloys (x = 0.07, 0.2, 0.4 wt. %) were designed as current collectors of positive electrodes in lithium ion batteries, and the microstructure, tensile strength, electrical conductivity and corrosion resistance of the alloys were investigated with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), a tensile test, an electrical conductivity test, and an electrochemical test. It was found that the amount of Fe content greatly affected the quantity of the second phases in the alloys. The higher the Fe content was, the more the second phases were. With increase of the Fe content, the tensile strength and corrosion resistance of the Al–xFe–Si–La alloys were improved, and the electrical conductivity of the Al–xFe–Si–La alloys could meet the application requirements. Compared to the Al–0.07Fe–0.1Si–0.07La alloy, the strength of the Al–0.4Fe–0.1Si–0.07La alloy was greatly enhanced. The Al–0.4Fe–0.1Si–0.07La alloy also had a higher corrosion potential than that of the Al–0.07Fe–0.1Si–0.07La alloy.
Highlights
With the rapid development of new-energy vehicles and portable mobile devices, lithium ion batteries (LIBs) have developed as good choices for their power supply
The second phases of the aluminum alloy specimens were observed with a scanning electron microscope (SEM, NOVA NANOSEM 230, FEI, Hillsborough, OR, USA)
This phenomenon indicated that the amount of Fe content greatly determined the quantity and the size of the second phases in the alloys
Summary
With the rapid development of new-energy vehicles and portable mobile devices, lithium ion batteries (LIBs) have developed as good choices for their power supply. Traditional aluminum alloys cannot meet the requirements of current collector materials for positive electrodes in lithium-ion batteries because they do not have good comprehensive properties (high electrical conductivity, high strength, and high corrosion resistance) [1,2,3,4]. Al–Fe alloy foils are believed to have high tensile strength, high electrical conductivity and good corrosion resistance, all of which make these foils suitable to be the materials for the current collectors of positive electrodes in LIBs. coarse a Fe-rich phase deteriorates the comprehensive performance of Al–Fe alloys. Few papers have reported on Al–Fe–Si–La alloys as current collectors of positive electrodes in LIBs. in this paper, the effects of Fe content on the microstructure, tensile strength, electrical conductivity and corrosion resistance of Al–Fe–Si–La alloys are investigated
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