Organosulfide-plasticized solid-electrolyte interphase layer enables stable lithium metal anodes for long-cycle lithium-sulfur batteries

Guoxing Li, Yue Gao, Xin He, Qingquan Huang, Shuru Chen, Seong H. Kim and Donghai Wang ()
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Guoxing Li: The Pennsylvania State University
Yue Gao: The Pennsylvania State University
Xin He: The Pennsylvania State University
Qingquan Huang: The Pennsylvania State University
Shuru Chen: The Pennsylvania State University
Seong H. Kim: The Pennsylvania State University
Donghai Wang: The Pennsylvania State University

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Lithium metal is a promising anode candidate for the next-generation rechargeable battery due to its highest specific capacity (3860 mA h g−1) and lowest potential, but low Coulombic efficiency and formation of lithium dendrites hinder its practical application. Here, we report a self-formed flexible hybrid solid-electrolyte interphase layer through co-deposition of organosulfides/organopolysulfides and inorganic lithium salts using sulfur-containing polymers as an additive in the electrolyte. The organosulfides/organopolysulfides serve as “plasticizer” in the solid-electrolyte interphase layer to improve its mechanical flexibility and toughness. The as-formed robust solid-electrolyte interphase layers enable dendrite-free lithium deposition and significantly improve Coulombic efficiency (99% over 400 cycles at a current density of 2 mA cm−2). A lithium-sulfur battery based on this strategy exhibits long cycling life (1000 cycles) and good capacity retention. This study reveals an avenue to effectively fabricate stable solid-electrolyte interphase layer for solving the issues associated with lithium metal anodes.

Date: 2017
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DOI: 10.1038/s41467-017-00974-x

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