Issue 2, 2016

A graphene-like metallic cathode host for long-life and high-loading lithium–sulfur batteries

Abstract

Development of Li–S batteries with long cycle life and high practical capacity is central to enable low-cost, large-scale energy storage. Sulfiphilic cathode materials with strong affinity for lithium (poly)sulfides are a promising new group of candidates to control dissolution/precipitation reactions in the cell, where the improvement of conductivity and the areal sulfur loading is an important objective. Here we report a metallic Co9S8 material with an interconnected graphene-like nano-architecture that realizes this aim. First-principles calculations coupled with spectroscopic evidence demonstrate the synergistic strong dual-interactions of polysulfides with the host. The three dimensional interconnected structure with hierarchical porosity not only manifests up to a factor of 10 increase of cycling stability (fade < 0.045% per cycle over 1500 cycles at C/2) compared to standard porous carbons but also, more importantly, enables a high-loading sulfur electrode with up to 75 wt% sulfur, and up to 4.5 mg cm−2 areal sulfur loading.

Graphical abstract: A graphene-like metallic cathode host for long-life and high-loading lithium–sulfur batteries

Supplementary files

Article information

Article type
Communication
Submitted
18 okt 2015
Accepted
07 des 2015
First published
09 des 2015

Mater. Horiz., 2016,3, 130-136

A graphene-like metallic cathode host for long-life and high-loading lithium–sulfur batteries

Q. Pang, D. Kundu and L. F. Nazar, Mater. Horiz., 2016, 3, 130 DOI: 10.1039/C5MH00246J

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