Abstract
Porous Si/Cu6Sn5/C composite containing native oxides was prepared via solid-state mechanical milling and wet chemical etching. This composite was used as anode material for Li-ion batteries. X-ray diffraction, scanning electron microscopy, 119Sn Mössbauer spectroscopy, and X-ray photoelectron spectroscopy show that the composite has a pitaya-like morphology based on porous Si and embedded Cu6Sn5 non-porous microparticles with surface native oxides. Both Si and Cu6Sn5 are electrochemically active, and the activation process during the first charge–discharge improves the nanostructuration of the composite that helps buffer the volume variations of the Li-Si and Li-Sn alloying reactions. The porous composite delivers a reversible and stable capacity of 900 mAh g−1 at a galvanostatic current density of 422 mA g−1 with a retention of 90% for 100 cycles, which is higher than porous Si (53%). The stability during cycling is explained by buffering effect, enhanced electrode conductivity, and stable SEI due to the presence of native oxides and the use of FEC-containing electrolyte.
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This work was financially supported by Project of National Natural Science Foundation (NSFC 21650110463), the Southwest Petroleum University key project (KSZ16083) and China scholarship council (CSC) program.
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He, Y., Ye, Z., Chamas, M. et al. Porous Si/Cu6Sn5/C composite containing native oxides as anode material for lithium-ion batteries. J Mater Sci: Mater Electron 33, 235–243 (2022). https://doi.org/10.1007/s10854-021-07288-1
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DOI: https://doi.org/10.1007/s10854-021-07288-1