Abstract
Lithium (Li)/sodium (Na)–sulfur (S) batteries are considered to be competitive candidates for the next-generation energy storage devices due to ultrahigh theoretical energy densities and potential low costs. However, the insulating nature of S and dissolution of intermediate polysulfides hinder the development. Here, the use of selenium (Se) or tellurium (Te) as eutectic accelerators in S cathodes can significantly improve the performances. Se and Te can not only be easily introduced into S to form uniform dispersions at the molecular level through S–Se or S–Te bonds and contribute to capacity through their inherent redox reactions, but also significantly accelerate reaction kinetics and alleviate polysulfide dissolution to achieve excellent battery performances. Even for solid-state conversion mechanisms or in all-solid-state batteries, Se or Te can enhance the electronic and ionic conductivities to result in better rate and cycling performances. Overall, Se or Te modified S cathodes possess good compatibility with both Li and Na anode materials and can exhibit excellent electrochemical performances. Therefore, the use of Se or Te as eutectic accelerators in S cathodes is a universal and effective strategy to enhance battery performances and obtain better Li/Na–S batteries.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.