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Mosaic rGO Layer on Lithium Metal Anodes for Effective Mediation of Lithium Plating and Stripping

Abstract

Passivation of lithium metal anodes to mitigate unstable solid electrolyte interface and parasitic dendrite growth is the premise for their successful implementation in lithium metal batteries. Herein, aiming to simultaneously reduce the interfacial resistance and suppress lithium dendrites, we coat the lithium metal anodes with two-dimensional (2D) rGO layers prepared via solvent evaporation assisted self-assembly. Upon lithiation/delithiation the rGO coating cracks into mosaic-like flakes, in between the interconnected gaps serve as the passage for uniform lithium plating/striping. Half cells composed of the sandwich Cu/Li/rGO electrode vs. Cu foils reveal much improved Li usage and Coulombic efficiencies. Through ex-situ SEM imaging and XPS depth profiling, a comprehensive view of Li intercalation, deposition, and dendrite suppression on the rGO coating is obtained. As a result of the improved kinetics of Li transportation, excellent electrochemical performances are demonstrated in the symmetric gLi‖gLi cells with a stabilized overpotential of only 87.9 mV at 5 mA cm-2 over 600 cycles, and in Li-S batteries with a stabilized capacity of 1200 mAh g-1 at 1 C near 1000 cycles.

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Publication details

The article was accepted on 12 Apr 2019 and first published on 13 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA03679B
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Mosaic rGO Layer on Lithium Metal Anodes for Effective Mediation of Lithium Plating and Stripping

    Y. Yao, X. Zhao, A. A. Razzaq, Y. Gu, X. Yuan, R. Shah, Y. Lian, J. Lei, Q. Mu, Y. Ma, Y. Peng, Z. Deng and Z. Liu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03679B

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