A sulfur host based on titanium monoxide@carbon hollow spheres for advanced lithium–sulfur batteries

Zhen Li, Jintao Zhang, Buyuan Guan, Da Wang, Li-Min Liu () and Xiong Wen (David) Lou ()
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Zhen Li: School of Chemical and Biomedical Engineering, Nanyang Technological University
Jintao Zhang: School of Chemical and Biomedical Engineering, Nanyang Technological University
Buyuan Guan: School of Chemical and Biomedical Engineering, Nanyang Technological University
Da Wang: Beijing Computational Science Research Center
Li-Min Liu: Beijing Computational Science Research Center
Xiong Wen (David) Lou: School of Chemical and Biomedical Engineering, Nanyang Technological University

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Lithium–sulfur batteries show advantages for next-generation electrical energy storage due to their high energy density and cost effectiveness. Enhancing the conductivity of the sulfur cathode and moderating the dissolution of lithium polysulfides are two key factors for the success of lithium–sulfur batteries. Here we report a sulfur host that overcomes both obstacles at once. With inherent metallic conductivity and strong adsorption capability for lithium-polysulfides, titanium monoxide@carbon hollow nanospheres can not only generate sufficient electrical contact to the insulating sulfur for high capacity, but also effectively confine lithium-polysulfides for prolonged cycle life. Additionally, the designed composite cathode further maximizes the lithium-polysulfide restriction capability by using the polar shells to prevent their outward diffusion, which avoids the need for chemically bonding all lithium-polysulfides on the surfaces of polar particles.

Date: 2016
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DOI: 10.1038/ncomms13065

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