Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7744677 | Solid State Ionics | 2018 | 5 Pages |
Abstract
A cheap Si powder byproduct from solar cell production was applied as a negative electrode for lithium-ion batteries. To improve the cycle and rate performances, the as-obtained Si powder was composited with tungsten oxide and coated with carbon, in sequence. After preparing the composite material, its electrochemical performance is evaluated, which exhibits a high reversible capacity of 975 mA h gâ 1 with improved cycleability. Especially, the rate capability is significantly improved to 390 mA h gâ 1 under 1000 mA gâ 1 applied current. This advanced electrochemical performance is attributed to the matrix effect of the formed Li2O and W metal with carbon coating, as identified using ex-situ X-ray diffraction experiments, and associated with the low polarization resistance observed in the galvanostatic charge intermittent technique.
Related Topics
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Authors
Hyun-seung Kim, Jongjung Kim, Jae Gil Lee, Ji Heon Ryu, Jaekwang Kim, Seung M. Oh, Songhun Yoon,