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Title: The Role of Functionalized Conducting Polymer Binders in Improving Power Density and Cycle Life of Lithium-Sulfur Batteries

Journal Article · · Journal of the Electrochemical Society

Abstract Lithium-sulfur batteries are promising as the next-generation of low-cost, high-energy rechargeable batteries. However, the commercialization of these batteries has been limited by poor rate capability and cycle life. To improve the performance of Li-S cells, we have investigated the role of two n-dopable conducting polymers, N2200 and N2200-OE, as binders for the sulfur cathode. The electron and ion transport properties of these polymer binders, along with their strong affinity for polysulfides, results in significantly enhanced performance compared to cells with the traditional insulating PVDF binder. The role of these conducting polymer binders in enhancing the performance of the cells is analyzed using impedance spectroscopy, shuttle current measurements, conductivity measurements, UV-Vis spectroscopy, GIWAXS studies, and post-cycling analysis of the anodes. The conducting polymer binders reduce the cell impedance by a factor of four, leading to a marked improvement in rate capability. The shuttling of the polysulfides and the formation of insoluble sulfides at the anode is curtailed by the interaction of the polysulfides with the backbone of the polymer binders, leading to an impressive capacity retention of 82% after 500 cycles. These studies demonstrate the benefit of tailored polymer binders at the sulfur electrode in addressing the limitations of lithium-sulfur batteries.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0019381; AC02-76SF00515
OSTI ID:
1892344
Alternate ID(s):
OSTI ID: 1889759
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Vol. 169 Journal Issue: 10; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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