Durable Lithium–Sulfur Batteries Based on a Composite Carbon Nanotube Cathode

Nadav Yahalom, Lior Snarski, Ayan Maity, Tatyana Bendikov, Michal Leskes, Haim Weissman, Boris Rybtchinski

Research output: Contribution to journalArticlepeer-review

Abstract

Lithium–sulfur (Li–S) batteries (LSBs) have high energy densities and employ inexpensive materials. However, the poor sulfur conductivity and rapid capacity fading hamper their applications. We developed a free-standing composite cathode based on multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs), whose fabrication follows a solution-based, scalable method. The two CNT types create a synergic effect: SWCNTs result in high conductivity, high surface area, and mechanical strength/flexibility; MWCNTs’ larger pores ensure facile ionic diffusion and trapping of lithium polysulfides. The composite cathode exhibits a peak discharge capacity of 1221 mAh/g, maintaining 876 mAh/g after 100 cycles at a 0.1C rate.
Original languageEnglish
Pages (from-to)4511-4519
JournalACS Applied Energy Materials
Volume6
Issue number9
DOIs
StatePublished - 8 May 2023

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