Analysis Of Anodic Nanotubular Oxide On Homogeneous Ti-Si Alloys For Li-Ion Battery Anodes
JOURNAL OF ALLOYS AND COMPOUNDS(2021)
摘要
The porous anodization of pure Ti and arc melted Ti2Si, and Ti4Si alloys were studied, aiming to produce novel anodes for lithium-ion batteries. The annealed and quenched Ti2Si alloys were homogeneous beta-martensite, while Ti4Si close to the maximal Si solubility presented Ti3Si and Ti5Si3 precipitates. The alloys anodized in standard HF + NH4F electrolyte showed an increasing tendency to detach the oxide layer with the Si content increase. The slope of the cell voltage transient partial derivative E/partial derivative t was used to evaluate each material's current efficiency. Si addition decreases the oxide's electronic conductivity and the oxygen evolution re-action but increases the oxide dissolution rate due to a higher Si dissolution rate. Consequently, higher current efficiency of oxide formation is observed during the barrier layer and a lower one during the porous layer formation. Nevertheless, the specific Li mass capacity increased by around 15% with 2 at% Si addition to Ti. (C) 2021 Elsevier B.V. All rights reserved.
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关键词
Li-ion batteries, Titanium oxide, TiSi alloy, Nanoporous anodizing
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