期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 45, 期 4, 页码 5283-5292出版社
WILEY
DOI: 10.1002/er.6147
关键词
anode; CoS2@co@C; dual coating; sodium‐ ion batteries; x‐ ray absorption spectroscopy
资金
- Deanship of Scientific Research at Princess Nourah Bint Abdulrahman University through the Fast-track Research Funding Program
- Research Center of the Female Scientific and Medical Colleges, Deanship of Scientific Research, King Saud University
- Deanship of Scientific Research, Imam Abdulrahman Bin Faisal University Dammam, Saudi Arabia [2019-399-Sc]
A dual coating strategy of CoS2 with metallic Co particles and carbon was used to enhance the performance and stability of rechargeable sodium-ion batteries. The prepared CoS2@Co@C anode showed high performance and stability, demonstrating reversible behavior.
Rechargeable sodium-ion batteries are facing the challenge of highly electrochemical active anode for their realization. In this study, we report a dual coating strategy of CoS2 with metallic Co particles and carbon to boost the charge transfer and stability. The phase of CoS2 and the existence of Co metallic particles were confirmed using x-ray diffraction (XRD). x-ray photoelectron spectroscopy (XPS) results corroborate the presence of carbon and Co-S bonding. The prepared CoS2@Co@C anode reveals high performance where it shows a capacity of 712 mA h g(-1) at 0.05 C rate. The CoS2@Co@C electrode exhibits exceptional high rate capability where it exhibits a capacity of 260 mA h g(-1) at elevated rate of 10.0 C. The cyclability of CoS2@Co@C anode is tested at 0.05 C and 0.5 C rates where the electrode shows 78% and 45% capacity retention of stabilized capacity. The reaction mechanism of the CoS2@Co@C electrode is determined using x-ray absorption spectroscopy (XAS) and the results show reversibility of the material.
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