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Substrate-Influenced Three-Dimensional Unoriented Dispersion Pathway for Dendrite-Free Lithium Metal Anode

Abstract

The lithium dendrite causes poor cycling performance and serious safety hazards, hindering the realization of lithium metal-based batteries. In this work, we develop a new substrate-influenced deposit strategy to turn Li deposition into a 3D unoriented dispersion pathway for dendrite-free lithium anodes. The high Li+-adsorption-ability MnO2 nanosheets are directly grown on the surface of Cu foil, which could serve as highly active and highly rough substrates for homogeneous current density distribution and Li-ion uniformization. Moreover, after the first discharging process at the pre-treatment stage, uniform LiMnO2 nanocrystals could be in situ reduced, which provide plenty of the active sites for Li nucleation. The Li deposit at first follows a random-oriented 3-D nucleation to adapt itself to the dispersed LiMnO2 nanocrystals. Very fine, randomly oriented particles are thus obtained, which could grow and coalesce into a compact Li layer. As a result, the unique 3D deposition pathway could effectively suppress the dendrites and mossy lithium formation and improve the performance such as stable cycling with low overpotential, high Coulombic efficiency and long lives. This work provides a new avenue for designing the dendrite-free Li metal anode by changing the lithium deposition pathway.

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Publication details

The article was received on 10 May 2018, accepted on 02 Jul 2018 and first published on 06 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04343D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Substrate-Influenced Three-Dimensional Unoriented Dispersion Pathway for Dendrite-Free Lithium Metal Anode

    M. Hu, Y. Yuan, M. Guo, Y. Pan and D. Long, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04343D

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