Beaded CoSe<sub>2</sub>-C Nanofibers for High-Performance Lithium–Sulfur Batteries
Lithium–sulfur (Li-S) batteries are regarded as highly promising energy storage devices due to their high theoretical specific capacity and high energy density. Nevertheless, the commercial application of Li-S batteries is still restricted by poor electrochemical performance. Herein, beaded nanofibe...
| 出版年: | Nanomaterials |
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| 主要な著者: | , , , , |
| フォーマット: | 論文 |
| 言語: | 英語 |
| 出版事項: |
MDPI AG
2023-09-01
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| 主題: | |
| オンライン･アクセス: | https://www.mdpi.com/2079-4991/13/17/2492 |
| 要約: | Lithium–sulfur (Li-S) batteries are regarded as highly promising energy storage devices due to their high theoretical specific capacity and high energy density. Nevertheless, the commercial application of Li-S batteries is still restricted by poor electrochemical performance. Herein, beaded nanofibers (BNFs) consisting of carbon and CoSe<sub>2</sub> nanoparticles (CoSe<sub>2</sub>/C BNFs) were prepared by electrospinning combined with carbonization and selenization. Benefitting from the synergistic effect of physical adsorption and chemical catalysis, the CoSe<sub>2</sub>/C BNFs can effectively inhibit the shuttle effect of lithium polysulfides and improve the rate performance and cycle stability of Li-S batteries. The three-dimensional conductive network provides a fast electron and ion transport pathway as well as sufficient space for alleviating the volume change. CoSe<sub>2</sub> can not only effectively adsorb the lithium polysulfides but also accelerate their conversion reaction. The CoSe<sub>2</sub>/C BNFs-S cathode has a high reversible discharge specific capacity of 919.2 mAh g<sup>−1</sup> at 0.1 C and presents excellent cycle stability with a low-capacity decay rate of 0.05% per cycle for 600 cycles at 1 C. The combination of the beaded carbon nanofibers and polar metal selenides sheds light on designing high-performance sulfur-based cathodes. |
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| ISSN: | 2079-4991 |