Jump to main content
Jump to site search

Issue 3, 2015
Previous Article Next Article

A class of polysulfide catholytes for lithium–sulfur batteries: energy density, cyclability, and voltage enhancement

Author affiliations

Abstract

Liquid-phase polysulfide catholytes are attracting much attention in lithium–sulfur (Li–S) batteries as they provide a facile dispersion and homogeneous distribution of the sulfur active material in the conductive matrix. However, the organic solvents used in lithium–polysulfide (Li–PS) batteries play an important role and have an impact on the physico-chemical characteristics of polysulfides. For instance, significantly higher voltages (∼2.7 V) of the S/Sn2− (4 ≤ n ≤ 8) redox couple are observed in Li–PS batteries with dimethyl sulfoxide (DMSO) and N-methyl-2-pyrrolidone (NMP) solvents. Accordingly, high power Li–PS batteries are presented here with the catholyte prepared with NMP solvent and operated with the highly reversible sulfur/long-chain polysulfide redox couple. On the other hand, a remarkable cyclability enhancement of the Li–PS battery is observed with the long-chain, ether-based tetraglyme (TEGDME) solvent. The voltage enhancement and the cyclability enhancement of the Li–PS batteries are attributed to the solvation effect, viscosity, and volatility of the solvents. Finally, highly concentrated polysulfide catholytes are successfully synthesized, with which high energy density Li–PS batteries are demonstrated by employing a multi-walled carbon nanotube (MWCNT) fabric electrode.

Graphical abstract: A class of polysulfide catholytes for lithium–sulfur batteries: energy density, cyclability, and voltage enhancement

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Oct 2014, accepted on 27 Nov 2014 and first published on 28 Nov 2014


Article type: Paper
DOI: 10.1039/C4CP04895D
Phys. Chem. Chem. Phys., 2015,17, 2127-2136

  •   Request permissions

    A class of polysulfide catholytes for lithium–sulfur batteries: energy density, cyclability, and voltage enhancement

    X. Yu and A. Manthiram, Phys. Chem. Chem. Phys., 2015, 17, 2127
    DOI: 10.1039/C4CP04895D

Search articles by author

Spotlight

Advertisements