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Depressing Irreversible Reaction on Three-Dimensional Interface towards High Areal Capacity Lithium Metal Anode

Abstract

Constructing 3D electrode structure emerges as an effective way to stabilize Li metal anode. However, 3D porous structure with relatively large surface area will enlarge contact area between electrolyte and Li, causing low Coulombic efficiency and capacity decay due to electrolyte decomposition at 3D interface, especially under high areal capacity situations. Herein, ultrathin (< 50nm) and conformal lithium ion conductive coating, composed by PEO/LiTFSI-based solid polymer electrolyte with graphene oxide as a functional filler to enhance ion conductivity, is proposed as a protective layer to address the above issue for 3D Li metal anodes. This coating layer can be applied on various 3D current collectors, such as Ni foam and carbon fiber cloth, and is effective in suppressing electrolyte decomposition and guiding uniform deposition of Li beneath it. As a result, irreversible capacity loss of the protected 3D Li anode drops to one-sixth of the un-coated one, and average Coulombic efficiency of 98.9% and stable cycling for over 800 h can be achieved under high areal capacity of 10 mAh cm-2. This work establishes a general approach of surface modification to depress irreversible reaction on the surface for practical 3D metallic Li anodes.

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Publication details

The article was received on 05 Jan 2019, accepted on 11 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C9TA00143C
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Depressing Irreversible Reaction on Three-Dimensional Interface towards High Areal Capacity Lithium Metal Anode

    W. Deng, S. Liang, X. Zhou, F. Zhao, W. Zhu and Z. Liu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA00143C

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