期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 19, 页码 11651-11664出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta01802g
关键词
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资金
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2021R1A4A200168711, NRF-2017M1A2A2087577, NRF-2018R1D1A3B07042514]
The introduction of a functional interlayer between the cathode and anode in lithium-sulfur battery technology leads to significant improvements in electrochemical performance. Hierarchically structured porous, conductive, and multifunctional N-doped carbon nanofibers are developed as functional interlayers for advanced LSBs, enhancing the rate capability and stable cycling performance of the Li-S cell.
The introduction of a functional interlayer between the cathode and anode in lithium-sulfur battery (LSB) technology results in significant improvements in electrochemical performance. Here, we developed hierarchically structured porous, conductive, and multifunctional N-doped carbon (N-C) nanofibers comprising homogeneously dispersed vanadium nitride quantum dots and hollow N-C nanocages as functional interlayers for advanced LSBs. The freestanding interlayer contains well-developed long-range channels and numerous interconnected hollow N-C nanocages derived from the metal-organic framework. Furthermore, the presence of a N-C framework and vanadium nitride quantum dots measuring several nanometers improves the redox reaction kinetics and provides numerous chemisorption sites for the effective trapping and reuse of lithium polysulfide. As a result, the assembled Li-S cell employing the unique nanostructured freestanding interlayer exhibits superior rate capability and stable cycling performance (decay rate of 0.02% per cycle at 0.5C) considering the high sulfur content (80 wt%) and loading (ca. 4 mg cm(-2)) in the sulfur electrodes. Even with an ultra-high sulfur loading of 11.0 mg cm(-2), the Li-S cell delivered a stable areal capacity of 5.0 mA h cm(-2) after 100 charge-discharge cycles at 0.05C. Thus, the uniquely nanostructured interlayer shows high potential for the development of advanced LSBs utilizing pure sulfur electrodes with realistic battery parameters.
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