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- W4283724851 abstract "Manganese dioxide (MnO2) with high theoretical capacity (1230 mAh/g) and low cost is considered as a promising anode material for next generation high energy density lithium-ion (Li+) batteries. However, the intrinsic low electric conductivity and volume change during cycling process limit its applications. In this work, a unique δ-MnO2/C composite has been synthesized through the directed growth of 2D δ-MnO2 nanosheets on the cabbage-leaf-derived biocarbon. The biocarbon acts as both structure buffer to accommodate the volume expansion and conductive agent to promote electron and ion transport. Moreover, oriented δ-MnO2 nanosheets are beneficial for increasing contact area between electrode and electrolyte, thus providing more active sites and shortening the Li+ transmission routes. Electrochemical performances show that δ-MnO2/C displays large reversible capacity (754 mAh/g after 250 cycles at current density of 0.1 A/g), excellent rate capability as well as low charge transfer resistance (17.3 Ω), and high Li+ diffusion rate (DLi+ = 2.91 × 10-14 cm2/s) during the cycles. Furthermore, the density functional theory calculations reveal the lower Li+ migration barrier energies and improved Li+ diffusion kinetics in δ-MnO2/C hetero-layer. This study provides a novel strategy to design advanced nanocomposites, using natural plant-leaf derivatives as structure-directing agents, for the next generation energy storage and conversion systems." @default.
- W4283724851 created "2022-07-01" @default.
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- W4283724851 date "2022-12-01" @default.
- W4283724851 modified "2023-10-17" @default.
- W4283724851 title "Biocarbon-directed vertical δ-MnO2 nanoflakes for boosting lithium-ion diffusion kinetics" @default.
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- W4283724851 doi "https://doi.org/10.1016/j.mtchem.2022.101023" @default.
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