Polycarboxylate Functionalized Graphene/S Composite Cathodes and Modified Cathode-Facing Side Coated Separators for Advanced Lithium-Sulfur Batteries

Nanoscale Research Letters
Maryam Sadat KiaiHuseyin Kizil

Abstract

Sulfur-hosting novel materials as a cathode for lithium-sulfur batteries are in the focus of many research to enhance the specific capacity and cycling stability. Herein, we developed composite cathodes consisting of polycarboxylate functionalized graphene (PC-FGF) doped with TiO2 nanoparticles or poly1,5-diaminoanthraquinone (PDAAQ) and sulfur to enhance chemisorption property toward polysulfides. Additionally, PC-FGF/sulfur composite cathode functions as an efficient trapping site for polysulfides spices as well as contributes to facilitate electron and Li-ions movement toward or from the cathode. In the first experiment, the cell with sulfur incorporated TiO2/PC-FGF cathode is assembled with three different cathode-facing side-coated glass fiber separators. At the second test, PDAAQ/PC-FGF cathode is assembled with the same separator materials as before.The best electrochemical performance observed was sulfur incorporated TiO2/PC-FGF cathode with PDAAQ/PC-FGF-coated separator having a high discharge capacity of 1100 mAh g- 1 at 0.5 C after 100 cycles. It is found that the combination of TiO2/PC-FGF/sulfur cathode and PDAAQ/PC-FCF separator could serve as promising cathode and separator material due to high cycling stability ...Continue Reading

References

Mar 31, 2011·Physical Chemistry Chemical Physics : PCCP·Yuliang CaoJun Liu
May 26, 2011·Nature Communications·Xiulei JiLinda F Nazar
Oct 25, 2011·Journal of the American Chemical Society·Liwen JiYuegang Zhang
Oct 12, 2012·Accounts of Chemical Research·Scott Evers, Linda F Nazar
Jul 16, 2014·Chemical Reviews·Arumugam ManthiramYu-Sheng Su
Feb 6, 2017·Advanced Materials·Xue LiuLiqiang Mai

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