Abstract
Electrode materials with high specific capacities such as metal sulfides always experience conversion and/or alloying reactions, which cause large volume changes during cycling. These repetitive volume changes eventually pulverize the active material and electrically isolate it from the current collector, consequently diminishing cycle stability. Here, we develop a self-buffering electrode constructed by ultra-large Fe7S8 nanoplates (S-Fe7S8) for sodium-ion batteries (SIBs). This hierarchical structure has a self-buffering effect on the large volume changes during cycling, which greatly enhances the cycling stability. In addition, the nano-micro hybrid structure as a whole does not show any apparent volume changes during cycling. Therefore, it is safe to conclude that the self-buffering structure is expected to be effective in accommodating volume changes in real batteries. Moreover, the combination of pseudocapacitance and redox reactions in the sodiation and desodiation processes provides the S-Fe7S8 electrode an exceptional rate capability.
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.
