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• W4313891842 endingPage "1413" @default.
• W4313891842 startingPage "1404" @default.
• W4313891842 abstract "Mn-rich orthorhombic (o)-LiMn1–xTixO2 with a stable oxygen/cation site occupancy and cycling-dependent phase transition is explored as a novel Co- and Ni-free cathode material for Li-ion rechargeable batteries. Typical o-LiMnO2 suffers from oxygen deficiency, cation mixing between Li and Mn, and monoclinic (m)-Li2MnO3 secondary phase with low conductivity. Together with these drawbacks, the gradual, irreversible phase transition from layered o-LiMnO2 into spinel-like cubic (c)-LixMnO2 (x ≈ 0.5) during repeated charge/discharge cycles degrades the cycling performance of o-LiMnO2 despite the activation of electroactive c-LixMnO2 (x ≈ 0.5). By contrast, o-LiMn1–xTixO2 consists of Ti-doped o-LiMnO2 and c-LiTiO2 as the primary and secondary phases, respectively. The presence of Ti–O bonds, stronger than the existing Mn–O bonds, improves the structural stability of Ti-doped o-LiMnO2 by reducing the imperfections of the oxygen/cation lattices (including Mn octahedral sites associated with the Jahn–Teller distortion) in Ti-doped o-LiMnO2 during the long-term synthesis under an inert atmosphere. In addition, the electrochemically inactive (>2 V vs Li+/Li) c-LiTiO2 phase with high conductivity serves as a pillar that suppresses the severe structural collapse of Ti-doped o-LiMnO2 through an abrupt phase/structural transition during cycling (2–4.5 V). As a result, o-LiMn1–xTixO2 with an optimal Ti content exhibits a higher maximum discharge capacity and superior cycling performance compared to the pristine o-LiMnO2." @default.
• W4313891842 created "2023-01-10" @default.
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• W4313891842 date "2023-01-09" @default.
• W4313891842 modified "2023-10-10" @default.
• W4313891842 title "Unexplored Orthorhombic LiMn_1–<i>x</i>Ti<i>_x</i>O₂ Cathode Materials with a Stable Atomic Site Occupancy and Phase Transition" @default.
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• W4313891842 doi "https://doi.org/10.1021/acs.energyfuels.2c03899" @default.
• W4313891842 hasPublicationYear "2023" @default.
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