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A leaf-like Al2O3-based quasi-solid electrolyte with a fast Li+ conductive interface for stable lithium metal anodes

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Abstract

Poor interfacial contact and Li dendritic growth severely restrict practical applications of Li metal anodes. Herein, we report a novel biomimetic solid-state electrolyte based on injection of 1 M LiTFSI-Py13TFSI ionic liquid electrolyte into a leaf-like Al2O3 skeleton through an in situ sol–gel method. This structure is intended to address the poor contact at the interface and protect the Li metal anode. A large amount of ionic liquid electrolyte was absorbed by the leaf-like Al2O3 skeleton owing to its high specific surface area. This system improved the ionic conductivity and promoted migration of Li+ both in the bulk and at the interface. The lithiophilic Al2O3 skeleton was in close contact with metallic Li and formed a fast Li+ conductive layer (Li–Al–O composition), which facilitated uniform deposition of Li and thus inhibited Li dendrite formation during long-term cycling. Moreover, density functional theory calculations indicated spontaneous generation of a Li–Al–O layer and [Py13]+ in the ionic liquid facilitates this process. Symmetric Li cells assembled with this electrolyte exhibited an extremely long cycle lifetime of 1100 h at a high constant current density. This strategy of a biomimetic leaf-structured electrolyte with a Li–Al–O conductive layer at the interface addresses problems of solid-state Li metal batteries and provides an alternative system for practical applications.

Graphical abstract: A leaf-like Al2O3-based quasi-solid electrolyte with a fast Li+ conductive interface for stable lithium metal anodes

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Supplementary files

Article information


Submitted
22 Feb 2020
Accepted
16 Mar 2020
First published
16 Mar 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

A leaf-like Al2O3-based quasi-solid electrolyte with a fast Li+ conductive interface for stable lithium metal anodes

Z. Wen, Y. Li, Z. Zhao, W. Qu, N. Chen, Y. Xing, Y. Ma, L. Li, F. Wu and R. Chen, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA02098B

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