Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 2, Pages 2479-2489Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b16080
Keywords
lithium metal anode; solid electrolyte interphase; Li-Sn alloy; DOL; lithium-sulfur batteries
Funding
- National Natural Science Foundation of China [21875172]
- National Key Research and Development Project [2016YFB0100400]
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Lithium-tin (Li-Sn) alloys are perfect substrate materials for anodes in high-energy density lithium metal secondary batteries. A new approach is proposed to further prevent the Li deposit on Li-Sn alloy substrates from reaction with electrolytes using an artificial solid electrolyte interphase (ASEI) based on electrochemical oxidation and polymerization of 1,3-dioxolane precursor with LiTFSI additive. This ASEI layer is flexible, stable, ion conductive, and electrically insulating, which can provide very stable cycling of Li-Sn alloy substrate anodes for Li deposition/stripping with an average Coulombic efficiency of 98.4% at a current density of 1 mA cm(-2). The Li-Sn alloy substrate is kept uniform and smooth without any dendrites and cracks after cycles. When the Li-Sn alloy substrate protected by ASEI is used as the anode of lithium-sulfur full cell, the cell shows much higher discharge capacity and better cycleability. This innovative and facile strategy of ASEI formation demonstrates a new and promising approach to the solution of the tough problems of Li dendrites in Li metal batteries.
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