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- W2079632427 abstract "We have investigated the charge-discharge mechanism in the first cycle and the origin of its high charge–discharge capacity for Li 1.2 Mn 0.4 Fe 0.4 O 2 (0.5Li 2 MnO 3 ·0.5LiFeO 2 ) positive electrode material of lithium ion batteries. Results reveal that oxygen loss occurs in the entire region of the Li 1.2 Mn 0.4 Fe 0.4 O 2 particles composed of Mn-rich (Fe-substituted Li 2 MnO 3 ) and Fe-rich (Mn-substituted LiFeO 2 ) nanodomains during the first charge. Nanodomains of Mn-Li ferrites with a spinel structure start to be formed along the particle surfaces. During the first discharge, the extracted oxygen is partially reinserted preferentially into the Fe-rich nanodomains as oxide ions rather than in the Mn-rich nanodomains, and the proportion of the spinel nanodomains decreases. The origin of the high charge–discharge capacity might be ascribed to the participation of the oxide ions and neutral oxygen species in charge compensation by incorporation of the LiFeO 2 component into Li 2 MnO 3 . Irreversible capacity at the first cycle can be caused by the irreversible loss of oxygen during the charge and irreversible structural changes throughout the cycle: the movements of transition metal ions inducing random cation-site occupation throughout the cycle, associated with the formation and incomplete disappearance of the spinel ferrite nanodomains which is almost electrochemically-inactive under the applied voltage range." @default.
- W2079632427 created "2016-06-24" @default.
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- W2079632427 date "2011-04-21" @default.
- W2079632427 modified "2023-10-16" @default.
- W2079632427 title "Participation of Oxygen in Charge/Discharge Reactions in Li<sub>1.2</sub>Mn<sub>0.4</sub>Fe<sub>0.4</sub>O<sub>2</sub>: Evidence of Removal/Reinsertion of Oxide Ions" @default.
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- W2079632427 doi "https://doi.org/10.1149/1.3571420" @default.
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