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• W2317605770 abstract "Novel heterolayered nanocomposites consisting of interstratified MnO2 and [Mn1/3Co1/3Ni1/3]O2 nanosheets are synthesized by a layer-by-layer self-assembly between negatively charged metal oxide nanosheets and lithium cations. According to powder X-ray diffraction and micro-Raman analysis, all of the as-prepared Li+–xMnO2–(1–x)[Mn1/3Co1/3Ni1/3]O2 nanocomposites with x = 1, 0.7, and 0.4 have a lamella structure with similar basal spacing of ∼7.1 Å, indicating the formation of lithium intercalation structure with cointercalated water bilayers. The nanoscale mixing of MnO2 and [Mn1/3Co1/3Ni1/3]O2 nanosheets is confirmed by energy-dispersive spectrometry–elemental mapping analysis. Upon a self-assembly with Li+ ions, there occur no marked changes in the octahedral symmetry and mixed oxidation state of M3+/M4+ ions (M = Mn, Co, and Ni) in the precursor metal oxide nanosheets. All of the as-prepared nanocomposites commonly experience a structural transformation from hydrated layered structure to dehydrated layered structure at 200 °C, which is followed by the second-phase transition to cubic spinel structure at 600 °C. Despite distinct structural changes of the nanocomposites at elevated temperatures, their porous stacking structure is well-maintained up to 400 °C. The heat-treatment at 400 °C leads to a significant improvement of the discharge capacity of the present nanocomposites because of the dehydration of as-prepared materials and the enhancement of crystallinity. The doping of [Mn1/3Co1/3Ni1/3]O2 layers enables us not only to increase the discharge capacity of the Li–MnO2 nanocomposite but also to prevent the phase transition of layered manganese oxide to spinel structure during electrochemical cycling. The present study clearly demonstrates that a postcalcination process as well as a partial doping of [Mn1/3Co1/3Ni1/3]O2 layer is effective in improving the electrode performance of reassembled Li–MnO2 nanocomposites." @default.
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• W2317605770 date "2012-01-30" @default.
• W2317605770 modified "2023-10-02" @default.
• W2317605770 title "Heterolayered Li⁺–MnO₂–[Mn_1/3Co_1/3Ni_1/3]O₂ Nanocomposites with Improved Electrode Functionality: Effects of Heat Treatment and Layer Doping on the Electrode Performance of Reassembled Lithium Manganate" @default.
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• W2317605770 doi "https://doi.org/10.1021/jp210063c" @default.
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