| Autor: |
Changyu Liu, Kean Chen, Huiqian Xiong, Along Zhao, Haiyan Zhang, Qingyu Li, Xinping Ai, Hanxi Yang, Yongjin Fang, Yuliang Cao |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
eScience, Vol 4, Iss 1, Pp 100186- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2667-1417 |
| DOI: |
10.1016/j.esci.2023.100186 |
| Popis: |
Sodium-ion batteries (SIBs) are regarded as the most promising technology for large-scale energy storage systems. However, the practical application of SIBs is still hindered by the lack of applicable cathode materials. Herein, a novel phase-pure polyanionic Na8Fe5(SO4)9 is designed and employed as a cathode material for SIBs for the first time. The Na8Fe5(SO4)9 has an alluaudite-type sulfate framework and small Na+ ion diffusion barriers. As expected, the as-synthesized Na8Fe5(SO4)9@rGO exhibits a high working potential of 3.8 V (versus Na/Na+), a superior reversible capacity of 100.2 mAh g−1 at 0.2 C, excellent rate performance (∼80 mAh g−1 at 10 C, ∼63 mAh g−1 at 50 C), and an ultra-long cycling life (91.9% capacity retention after 10,000 cycles at 10 C, 81% capacity retention after 20,000 cycles at 50 C). We use various techniques and computational methods to comprehensively investigate the electrochemical reaction mechanisms of Na8Fe5(SO4)9@rGO. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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