Rational Construction of Fe2N@C Yolk–Shell Nanoboxes as Multifunctional Hosts for Ultralong Lithium–Sulfur Batteries
| Autor: | Shiqiang Luo, Kai Xie, Xiaojian Tan, Xiaobin Hong, Yujie Li, Chunman Zheng, Chang Liu, Yumin Liu, Weiwei Sun, Shuangke Liu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Engineering General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Sulfur Redox 0104 chemical sciences Catalysis Chemical bond chemistry Chemical engineering Chemisorption General Materials Science Density functional theory 0210 nano-technology Carbon |
| Zdroj: | ACS Nano. 13:12137-12147 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.9b06629 |
| Popis: | Rationally constructing inexpensive sulfur hosts that have high electronic conductivity, large void space for sulfur, strong chemisorption, and rapid redox kinetics to polysulfides is critically important for their practical use in lithium-sulfur (Li-S) batteries. Herein, we have designed a multifunctional sulfur host based on yolk-shelled Fe2N@C nanoboxes (Fe2N@C NBs) through a strategy of etching combined with nitridation for high-rate and ultralong Li-S batteries. The highly conductive carbon shell physically confines the active material and provides efficient pathways for fast electron/ion transport. Meanwhile, the polar Fe2N core provides strong chemical bonding and effective catalytic activity for polysulfides, which is proved by density functional theory calculations and electrochemical analysis techniques. Benefiting from these merits, the S/Fe2N@C NBs electrode with a high sulfur content manifests a high specific capacity, superior rate capability, and long-term cycling stability. Specifically, even after 600 cycles at 1 C, a capacity of 881 mAh g-1 with an average fading rate of only 0.036% can be retained, which is among the best cycling performances reported. The strategy in this study provides an approach to the design and construction of yolk-shelled iron-based compounds@carbon nanoarchitectures as inexpensive and efficient sulfur hosts for realizing practically usable Li-S batteries. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|