A saccharide-based binder for efficient polysulfide regulations in Li-S batteries

Yingyi Huang, Mahdokht Shaibani (), Tanesh D. Gamot, Mingchao Wang, Petar Jovanović, M. C. Dilusha Cooray, Meysam Sharifzadeh Mirshekarloo, Roger J. Mulder, Nikhil V. Medhekar, Matthew R. Hill () and Mainak Majumder ()
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Yingyi Huang: Monash University
Mahdokht Shaibani: Monash University
Tanesh D. Gamot: Monash University
Mingchao Wang: Monash University
Petar Jovanović: Monash University
M. C. Dilusha Cooray: Monash University
Meysam Sharifzadeh Mirshekarloo: Monash University
Roger J. Mulder: CSIRO
Nikhil V. Medhekar: Monash University
Matthew R. Hill: CSIRO
Mainak Majumder: Monash University

Nature Communications, 2021, vol. 12, issue 1, 1-15

Abstract: Abstract The viability of lithium-sulfur batteries as an energy storage technology depends on unlocking long-term cycle stability. Most instability stems from the release and transport of polysulfides from the cathode, which causes mossy growth on the lithium anode, leading to continuous consumption of electrolyte. Therefore, development of a durable cathode with minimal polysulfide escape is critical. Here, we present a saccharide-based binder system that has a capacity for the regulation of polysulfides due to its reducing properties. Furthermore, the binder promotes the formation of viscoelastic filaments during casting which endows the sulfur cathode with a desirable web-like microstructure. Taken together this leads to 97% sulfur utilisation with a cycle life of 1000 cycles (9 months) and capacity retention (around 700 mAh g−1 after 1000 cycles). A pouch cell prototype with a specific energy of up to 206 Wh kg−1 is produced, demonstrating the promising potential for practical applications.

Date: 2021
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DOI: 10.1038/s41467-021-25612-5

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