Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

Ling, Min; Zhang, Liang; Zheng, Tianyue; Feng, Jun; Guo, Jinghua; Mai, Liqiang; Liu, Gao

doi:10.1016/j.nanoen.2017.05.020

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

Journal Article · Wed May 10 04:00:00 EDT 2017 · Nano Energy

DOI:https://doi.org/10.1016/j.nanoen.2017.05.020· OSTI ID:1417600

Ling, Min ^[1]; Zhang, Liang ^[2]; Zheng, Tianyue ^[1]; Feng, Jun ^[2]; Guo, Jinghua ^[2]; Mai, Liqiang ^[3]; Liu, Gao ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Applied Energy Materials Group. Energy Storage and Distributed Resources Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Wuhan Univ. of Technology (China). State Key Lab. of Advanced Technology for Materials Synthesis and Processing

Polysulfide shuttling has been the primary cause of failure in lithium-sulfur (Li-S) battery cycling. In this paper, we demonstrate an nucleophilic substitution reaction between polysulfides and binder functional groups can unexpectedly immobilizes the polysulfides. The substitution reaction is verified by UV–visible spectra and X-ray photoelectron spectra. The immobilization of polysulfide is in situ monitored by synchrotron based sulfur K-edge X-ray absorption spectra. The resulting electrodes exhibit initial capacity up to 20.4 mAh/cm², corresponding to 1199.1 mAh/g based on a micron-sulfur mass loading of 17.0 mg/cm². The micron size sulfur transformed into nano layer coating on the cathode binder during cycling. Directly usage of nano-size sulfur promotes higher capacity of 33.7 mAh/cm², which is the highest areal capacity reported in Li-S battery. Finally, this enhance performance is due to the reduced shuttle effect by covalently binding of the polysulfide with the polymer binder.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Key Research and Development Program of China; National Natural Science Fund for Distinguished Young Scholars (China)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1417600

Alternate ID(s):: OSTI ID: 1396405

Journal Information:: Nano Energy, Journal Name: Nano Energy Vol. 38; ISSN 2211-2855

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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