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

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...

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Bibliographic Details
Published inBatteries (Basel) Vol. 4; no. 2; p. 22
Main Authors Liao, Junbin, Ye, Zhibin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2018
Subjects
Assembly
assembly pressure
Carbon black
Cycles
Electric potential
Electrodes
Electrolytes
Electrolytic cells
Foils
Lithium
Lithium sulfur batteries
lithium-sulfur battery
Polymers
polysulfide shuttling
Polysulfides
Separators
sheet number of separator
Sulfur content
trivial parameters
Canada
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Summary: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.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries4020022