Electrochemical reactivity of ball-milled MoO(3-y) as anode materials for lithium-ion batteries
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- Electrochemical reactivity of ball-milled MoO(3-y) as anode materials for lithium-ion batteries
- Jung, Yoon Seok; Lee, Sangkyoo; Ahn, Dongjoon; Dillon, Anne C.; Lee, Se-Hee
- Ball-milling; Conversion reaction; Li-ion batteries; Metal oxide; Nanostructure; Reactivity
- Issue Date
- ELSEVIER SCIENCE BV
- JOURNAL OF POWER SOURCES, v.188, no.1, pp.286 - 291
- The electrochemical reactivity of ball-milled MoO3 powders was investigated in Li rechargeable cells. High-energy ball-milling converts highly-crystalline MoO3 bulk powders into partially reduced low-crystalline MoO3-y materials with a reduced particle size. Both bulk and ball-milled MoO3 exhibit a first discharge capacity beyond 1100 mAh g-1 when tested in the 0-3 V (vs. Li/Li+) range, which is indicative of a complete conversion reaction. It is found that partial reduction caused by ball-milling results in a reduction in the conversion reaction. Additionally, incomplete re-oxidation during subsequent charge results in the formation of MoO2 instead of MoO3, which in turn affects the reactivity in subsequent cycles. As compared to bulk MoO3, ball-milled MoO3-y showed significantly enhanced cycle performance (bulk: 27.6% charge capacity retention at the 10th cycle vs. ball-milled for 8 h: 64.4% at the 35th cycle), which can be attributed to the nano-texture wherein nanometer-sized particles aggregate to form secondary ones.
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