In-situ covalent bonding of polysulfides with electrode binders in operando for lithium–sulfur batteries

In-situ covalent bonding of polysulfides with electrode binders in operando for lithium–sulfur batteries

TitleIn-situ covalent bonding of polysulfides with electrode binders in operando for lithium–sulfur batteries
Publication TypeJournal Article
Year of Publication2018
AuthorsChangAn Yang, QiaoKun Du, Zeheng Li, Min Ling, Xiangyun Song, Vincent S Battaglia, Xiaobo Chen, Gao Liu
JournalJournal of Power Sources
Volume402
Pagination1 - 6
Date Published10/31/2018
ISSN03787753
Abstract

Dissolved polysulfides cause high self-discharge, low coulombic efficiency and short cycling life due to their shuttle effect in the charge/discharge cycles in lithium-sulfur (Li-S) batteries. Despite of various attempts (e.g., addition of metal oxides and chalcogenides in the cathode, immobilization of sulfur with various carbons, and confinement of sulfur within the cathode side with membranes) in solving this problem, it still remains a major challenge for Li-S batteries. Here, we demonstrate that chemically active binders can in situ bond to the polysulfides in the electrode. Besides the common binding functions of the cathode materials to the current collector, the covalent bonding between binders and polysulfides could bestow the higher capacity, stable cycling and high coulombic efficiency, even under the high loading of sulfur contents. Thus, this study provides an alternative and effective way in solving the shuttle effect of the dissolved lithium polysulfides for Li-S batteries.

DOI10.1016/j.jpowsour.2018.09.008
Short TitleJournal of Power Sources
Refereed DesignationRefereed