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Facile and Scalable Synthesis of Copolymer-Sulfur Composites as Cathodes for High Performance Lithium-Sulfur Batteries

Published online by Cambridge University Press:  21 June 2017

Jingjing Liu
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA
Brennan Campbell
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA
Rachel Ye
Affiliation:
Mechanical Engineering Department, University of California, Riverside, CA, 92521, USA
Jeffrey Bell
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA
Zafer Mutlu
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA
Changling Li
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA
Yiran Yan
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA
Mihri Ozkan
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA Electrical and Computer Engineering Department, University of California, Riverside, CA, 92521, USA
Cengiz Ozkan*
Affiliation:
Materials Science and Engineering Program, University of California, Riverside, CA, 92521, USA Mechanical Engineering Department, University of California, Riverside, CA, 92521, USA
*
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Abstract

To promote the energy density of lithium-ion battery, the sulfur-based cathode has attracted extensive attention because of its high specific capacity of 1672 mAh g-1 and its high abundance. However, the sulfur shuttling effects and the loss of active material during lithiation hinder its commercial application. To tackle these issues, we synthesized a stable copolymer-sulfur composite by chemically binding sulfur. The composite with 86% sulfur content was prepared using 1,3-diethynylbenzen and sulfur particles via scalable invers vulcanization. The sulfur content in copolymer sulfur was achieved as high as 86%. Our copolymer-sulfur composite cathode showed excellent cycling performance with a specific capacity of 454 mAh g-1 at 0.1 C after 300 cycles. We demonstrate that the organosulfur-DEB units in the copolymer-sulfur composite serve as the ‘plasticizer’ to effectively prevent the polysulfide shuttling.

Type
Articles
Copyright
Copyright © Materials Research Society 2017 

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References

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