Abstract
Fe-Si-Zn alloys prepared by ball milling were investigated as negative electrodes for Li-ion batteries. X-ray diffraction and room temperature 57Fe Mössbauer measurements were used to characterize alloy structure. Electrochemistry of the alloys was determined at 30°C. Formation of crystalline Li15Si4 was suppressed during cycling for compositions with greater than 10 at. % Fe. Unlike sputtered films of the same composition, the incorporation of Zn in these ball milled alloys did not suppress Li15Si4 formation. Instead, Zn behaved as if it were in a physical mixture with the other alloy components. This study shows that sputtered and ball milled alloys of the same composition can have very different electrochemical properties.
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