Abstract
Currently, lithium–sulfur batteries suffer from several critical limitations that hinder their practical application, such as the large volumetric expansion of electrode, poor conductivity and lower sulfur utilization. In this work, TiO2 nanofibers with mesoporous structure have been synthesized by electrospinning and heat treating. As the host material of cathode for Li–S battery, the as prepared samples with novelty structure could enhance the conductivity of cathode composite, promote the utilization of sulfur, and relieve volume expansion for improving the electrochemical property. The initial discharge capacity of TiO2/S composite cathode is 703 mAh/g and the capacity remained at 652 mAh/g after 200 cycles at 0.1 C, whose the capacity retention remains is at 92.7%, demonstrating great prospect for application in high-performance Li–S batteries.
Highlights
With the rapid development of portable equipment, handheld electronic products and hybrid electric vehicles, problems related to energy storage and conversion devices have attracted more and more attention
Currently most traditional lithium–sulfur batteries suffer from several critical limitations that hinder their practical application on account of the large volumetric expansion of elemental sulfur during lithiation, poor conductivity of both the final products, and so on
The cathode conductivity is improved by T iO2/S composite as electrodes. It results in excellent electrochemical performance and significantly improved cycle stability of the TiO2/S composite cathode for Li–S batteries
Summary
With the rapid development of portable equipment, handheld electronic products and hybrid electric vehicles, problems related to energy storage and conversion devices have attracted more and more attention. In the discharge process, the major obstacle is that intermediate polysulfides are highly dissolved in organic electrolyte, which the so-called “shuttle effect” causes an irreversible loss of active sulfur, poor cycle stability and. To overcome these impediments for the development of Li–S batteries, several strategies have been developed. It is important to prepare the TiO2 with the mesoporous structure by simple methods and research on charge and discharge mechanism of Li–S batteries deeply. The mesoporous structure could encapsulate sulfur in their pores to trap soluble polysulfides (S8 combining with the L i+ in the anode), and accommodate large volumetric expansion of sulphur during lithiation/delithiation. It results in excellent electrochemical performance and significantly improved cycle stability of the TiO2/S composite cathode for Li–S batteries
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
