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https://hdl.handle.net/2440/133854
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Type: | Journal article |
Title: | Strong affinity of polysulfide intermediates to multi-functional binder for practical application in lithium-sulfur batteries |
Author: | Wang, H. Sencadas, V. Gao, G. Gao, H. Du, A. Liu, H. Guo, Z. |
Citation: | Nano Energy, 2016; 26:722-728 |
Publisher: | Elsevier |
Issue Date: | 2016 |
ISSN: | 2211-2855 2211-3282 |
Statement of Responsibility: | Hongqiang Wang, Vitor Sencadas, Guoping Gao, Hong Gao, Aijun Du, Huakun Liu, Zaiping Guo |
Abstract: | Binder, one of the most important battery components, plays a critical role in lithium–sulfur batteries. Poly(vinylidene difluoride) (PVDF), a commonly used binder in lithium–sulfur batteries, does not have a strong affinity to the intermediate polysulfides, however, leading to fast capacity fading with electrochemical cycling. Herein, copolymers of vinylidene difluoride with other monomers are used as multifunctional binders to enhance the electrochemical performance of lithium–sulfur batteries. Compared to the PVDF, the copolymer, poly(vinylidene difluoride-trifluoroethylene) (P(VDF-TRFE)) binder exhibits higher adhesion strength, less porosity, and stronger chemical interaction with polysulfides, which helps to keep the polysulfides within the cathode region, thereby improving the electrochemical performance of the lithium–sulfur battery. As a result, sulfur electrode with P(VDF-TRFE) binder delivered a high capacity of 801 mA h g1 at 0.2 C after 100 cycles, which is nearly 80% higher capacity than the corresponding sulfur cathode with PVDF binder. |
Keywords: | Lithium–sulfur batteries; Copolymer binder; Chemical affinity; Polysulfide intermediates; Density functional theory (DFT) calculations |
Rights: | © 2016 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.nanoen.2016.06.036 |
Grant ID: | http://purl.org/au-research/grants/arc/DP1094261 http://purl.org/au-research/grants/arc/LE0882613 |
Published version: | http://dx.doi.org/10.1016/j.nanoen.2016.06.036 |
Appears in Collections: | Chemical Engineering publications |
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