Journal
NANOSCALE
Volume 10, Issue 39, Pages 18786-18794Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr05652h
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Funding
- Hunan Province of China [2018JJ3633]
- China Postdoctoral Science Foundation [2017M6203552]
- Young Elite Scientists Sponsorship Program By CAST [2017QNRC001]
- Fundamental Research Funds for the Central Universities of Central South University [2018zzts368]
- National Natural Science Foundation of China [51622406, 21673298, 21473258]
- National Key Research and Development Program of China [2017YFB0102003, 2018YFB0104204]
- National Postdoctoral Program for Innovative Talents [BX00192]
- Hunan Provincial Science and Technology Plan [2017TP1001]
- Project of Innovation Driven Plan in Central South University [2017CX004, 2018CX005]
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Transition metal sulfides (TMSs) have been extensively studied as electrode materials for sodium-ion batteries by virtue of their high theoretical capacity. However, the poor cyclability limits the practical application of TMSs in sodium ion batteries. In this study, N-rich carbon-coated Co3S4 ultrafine nanocrystal (Co3S4@NC) was prepared by utilizing ZIF-67 as a precursor through continuous carbonization and sulfuration processes, exhibiting ultrafine nanocrystals with a diameter of about 5 nm. When utilized as the anode for sodium ion batteries, the nanohybrid material exhibits remarkable cycling performance with a high specific capacity of 420.9 mA h g(-1) at the current density of 100 mA g(-1) after 100 cycles, indicating that the cycling performance is strengthened by the nitrogen-doped carbon coating. Impressively, the obtained material shows good rate performances with reversible specific capacities of 386.7, 284.0, and 151.2 mA h g(-1) at 400, 1000, and 1400 mA g(-1), respectively, due to the high surface-capacitance contribution and porous structure inherited from the precursor, which finally results in the increase in infiltration of electrolyte and the accelerating diffusion rate of Na+. This study sheds light on the routes to improve the performance of TMSs@nitrogen-doped carbon nanohybrid materials for sodium ion batteries.
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