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Batteries 2018, 4(2), 22; https://doi.org/10.3390/batteries4020022

Nontrivial Effects of “Trivial” Parameters on the Performance of Lithium–Sulfur Batteries

1
and
1,2,*
1
Bharti School of Engineering, Laurentian University, Sudbury, ON P3E 2C6, Canada
2
Department of Chemical and Materials Engineering, Concordia University, Montreal, QC H3G 1M8, Canada
*
Author to whom correspondence should be addressed.
Received: 7 March 2018 / Revised: 25 April 2018 / Accepted: 28 April 2018 / Published: 2 May 2018
(This article belongs to the Special Issue Lithium-Sulfur Batteries)
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Abstract

A robust lithium-sulfur (Li–S) battery is constituted by a wide range of optimized fundamental parameters (e.g., amount of electrolyte, electrolyte additive, sulfur loading density, and the size of sulfur particles). In this paper, some other often-neglected “trivial” parameters (including assembly pressure of the coil cells, thickness of spring/lithium foil in coin cells, sheet number of separator, and cut-off voltage) of Li–S batteries have been demonstrated to show pronounced effects on the battery performance. Our results indicate that the coin cell assembly pressure and sheet number of the separator play the important roles in suppressing polysulfide shuttling over battery cycling, which improves significantly the cycling life of Li–S batteries. The thickness of springs/lithium foils also affects the battery performance greatly. When switching the cut-off voltage of 1.5–3.0 V to narrower ones (1.7–2.5 V or 1.8–2.6 V), the cycling life of batteries at 0.2 C can be further enhanced to >300 cycles while with no drastic polysulfide shuttling. Adjusting these trivial parameters can thus synergistically improve the cycling performance of Li–S batteries. View Full-Text
Keywords: lithium-sulfur battery; trivial parameters; polysulfide shuttling; assembly pressure; sheet number of separator lithium-sulfur battery; trivial parameters; polysulfide shuttling; assembly pressure; sheet number of separator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liao, J.; Ye, Z. Nontrivial Effects of “Trivial” Parameters on the Performance of Lithium–Sulfur Batteries. Batteries 2018, 4, 22.

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