Surface-enhanced redox chemistry of polysulphides on a metallic and polar host for lithium-sulphur batteries

Quan Pang, Dipan Kundu, Marine Cuisinier, L. F. Nazar

Research output: Contribution to journalArticle

629 Citations (Scopus)

Abstract

The lithium-sulphur battery relies on the reversible conversion between sulphur and Li2S and is highly appealing for energy storage owing to its low cost and high energy density. Porous carbons are typically used as sulfur hosts, but they do not adsorb the hydrophilic polysulphide intermediates or adhere well to Li2S, resulting in pronounced capacity fading. Here we report a different strategy based on an inherently polar, high surface area metallic oxide cathode host and show that it mitigates polysulphide dissolution by forming an excellent interface with Li2S. Complementary physical and electrochemical probes demonstrate strong polysulphide/Li2S binding with this 'sulphiphilic' host and provide experimental evidence for surface-mediated redox chemistry. In a lithium-sulphur cell, Ti 4O7/S cathodes provide a discharge capacity of 1,070mAhg-1 at intermediate rates and a doubling in capacity retention with respect to a typical conductive carbon electrode, at practical sulphur mass fractions up to 70wt%. Stable cycling performance is demonstrated at high rates over 500 cycles.

Original languageEnglish
Article number4759
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 26 Aug 2014
Externally publishedYes

Fingerprint

lithium sulfur batteries
polysulfides
Lithium
Sulfur
Oxidation-Reduction
sulfur
chemistry
Electrodes
Cathodes
Carbon
cathodes
cycles
carbon
fading
energy storage
Energy storage
Oxides
dissolving
Dissolution
flux density

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Surface-enhanced redox chemistry of polysulphides on a metallic and polar host for lithium-sulphur batteries. / Pang, Quan; Kundu, Dipan; Cuisinier, Marine; Nazar, L. F.

In: Nature Communications, Vol. 5, 4759, 26.08.2014.

Research output: Contribution to journalArticle

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