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Poly(thiourea triethylene glycol) as a multifunctional binder for enhanced performance in lithium-sulfur batteries

Authors :
Luke Hencz
Hao Chen
Zhenzhen Wu
Xingxing Gu
Meng Li
Yuhui Tian
Su Chen
Cheng Yan
Abdulaziz S.R. Bati
Joseph G. Shapter
Milton Kiefel
Dong-Sheng Li
Shanqing Zhang
Source :
Green Energy & Environment, Vol 7, Iss 6, Pp 1206-1216 (2022)
Publication Year :
2022
Publisher :
KeAi Communications Co., Ltd., 2022.

Abstract

A mechanically strong binder with polar functional groups could overcome the dilemma of the large volume change during charge/discharge processes and poor cyclability of lithium-sulfur batteries (LSBs). In this work, for the first time, we report the use of poly(thiourea triethylene glycol) (PTTG) as a multifunctional binder for sulfur cathodes to enhance the performance of LSBs. As expected, the PTTG binder facilitates the high performance and stability delivered by the Sulfur-PTTG cathode, including a higher reversible capacity of 825 mAh g−1 at 0.2 C after 80 cycles, a lower capacity fading (0.123% per cycle) over 350 cycles at 0.5 C, a higher areal capacity of 2.5 mAh cm−2 at 0.25 mA cm−2, and better rate capability of 587 mAh g−1 at 2 C. Such superior electrochemical performances could be attributed to PTTG's strong chemical adsorption towards polysulfides which may avoid the lithium polysulfide shuttle effect and excellent mechanical characteristics which prevents electrode collapse during cycling and allows the Sulfur-PTTG electrode to maintain robust electron and ion migration pathways for accelerated redox reaction kinetics.

Details

Language :
English
ISSN :
24680257
Volume :
7
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Green Energy & Environment
Publication Type :
Academic Journal
Accession number :
edsdoj.1022bfe4df214eaca0a92275b1a4af02
Document Type :
article
Full Text :
https://doi.org/10.1016/j.gee.2021.01.014