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Lee, Kyu Tae
Electrochemical Energy Systems Laboratory
Research Interests
  • Electrode materials for Li-ion batteries
  • Na-ion & Mg-ion batteries
  • Li-Air & Li-Sulur batteries
  • Design of advanced materials with new crystal structures
  • Fundamental electrochemistry & solid state chemistry

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A highly ordered nanostructured carbon-sulphur cathode for lithium-sulphur batteries

Cited 969 times inthomson ciCited 778 times inthomson ci
Title
A highly ordered nanostructured carbon-sulphur cathode for lithium-sulphur batteries
Author
Ji, XiuleiLee, Kyu TaeNazar, Linda F.
Keywords
Assembly process; Carbon surface; Chemical gradients; Electrical contacts; Electrode material; Energy density; Gravimetric capacity; Ingress/egress; Ion systems; Materials scientist; Mesoporous carbon; Nanofiller; Nanostructured carbons; New opportunities; Polymer modifications; Polysulphides; Reversible capacity; Sorption properties
Issue Date
2009-06
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE MATERIALS, v.8, no.6, pp.500 - 506
Abstract
The Li-S battery has been under intense scrutiny for over two decades, as it offers the possibility of high gravimetric capacities and theoretical energy densities ranging up to a factor of five beyond conventional Li-ion systems. Herein, we report the feasibility to approach such capacities by creating highly ordered interwoven composites. The conductive mesoporous carbon framework precisely constrains sulphur nanofiller growth within its channels and generates essential electrical contact to the insulating sulphur. The structure provides access to Li(+) ingress/egress for reactivity with the sulphur, and we speculate that the kinetic inhibition to diffusion within the framework and the sorption properties of the carbon aid in trapping the polysulphides formed during redox. Polymer modification of the carbon surface further provides a chemical gradient that retards diffusion of these large anions out of the electrode, thus facilitating more complete reaction. Reversible capacities up to 1,320m Ah g(-1) are attained. The assembly process is simple and broadly applicable, conceptually providing new opportunities for materials scientists for tailored design that can be extended to many different electrode materials.
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DOI
10.1038/NMAT2460
ISSN
1476-1122
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ECHE_Journal Papers
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