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- W2912278871 abstract "The silicon–oxygen binary system (SiOx) is a promising candidate as a negative electrode for next-generation lithium-ion batteries. Thin SiOx films of different oxygen contents were prepared by magnetron sputtering. Although almost all Si atoms in SiOx at low oxygen contents (x = 0.21 and 0.48) contributed to the reversible alloying/dealloying reactions, an irreversible fraction of Si in SiOx at high oxygen contents (x = 1.09 and 1.78) increased owing to the formation of Li4SiO4. In return for the decrease of reversible capacity, the capacity retention of heavily O-doped SiOx films improved owing to the buffer effect of Li4SiO4 matrix against volume changes. The addition of vinylene carbonate (VC) to the electrolyte further improved the cyclability of the SiOx films, especially those of higher oxygen contents. For the pure-Si film, a sponge-like porous structure appeared after cycling owing to repeated crack formation and inhomogeneous volume changes, and resulted in massive electrode swelling. The morphology change with cycling was suppressed by the presence of Li4SiO4 matrix and a homogeneous solid electrolyte interphase derived from VC, resulting in a superior cycle performance of the heavily O-doped SiOx negative electrodes." @default.
- W2912278871 created "2019-02-21" @default.
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- W2912278871 date "2019-01-01" @default.
- W2912278871 modified "2023-09-25" @default.
- W2912278871 title "Oxygen-Content Dependence of Cycle Performance and Morphology Changes in Amorphous-SiO<i><sub>x</sub></i> Thin-Film Negative Electrodes for Lithium-Ion Batteries" @default.
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- W2912278871 doi "https://doi.org/10.1149/2.0861902jes" @default.
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