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Issue 8, 2011
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High “C” rate Li-S cathodes: sulfur imbibed bimodal porous carbons

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Abstract

A highly ordered mesoporous carbon with a bimodal pore structure which exhibits a high specific area and large pore volume, was synthesized by a triblock-copolymer-templating approach. This optimized framework served as the scaffold for the preparation of carbon/sulfur (C/S) nanocomposites that serve as novel cathodes for Li-S batteries. They exhibit high discharge capacities and good cycling stability at very high current rates of 1675 mA g−1 (1 C), which can be attributed to the unique bimodal porous structure of the carbon. The small mesopores contain the majority of the sulfur mass and aid in suppressing the diffusion of polysulfide species into the electrolyte, whilst the large interconnected cylindrical pores favour rapid transport of solvated Li+ on charge/discharge. Additional doping with hydrophilic nanoporous silica also aids in capacity retention on cycling.

Graphical abstract: High “C” rate Li-S cathodes: sulfur imbibed bimodal porous carbons

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Article information


Submitted
23 Feb 2011
Accepted
04 Apr 2011
First published
08 Jul 2011

Energy Environ. Sci., 2011,4, 2878-2883
Article type
Paper

High “C” rate Li-S cathodes: sulfur imbibed bimodal porous carbons

G. He, X. Ji and L. Nazar, Energy Environ. Sci., 2011, 4, 2878
DOI: 10.1039/C1EE01219C

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