Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 4, Pages 2205-2213Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta10515e
Keywords
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Funding
- Postdoctoral Science Foundation of China [2018M630747]
- Shandong Provincial Natural Science Foundation [ZR2018JL021]
- Shandong Provincial Key Research Development Program [2019GGX102067]
- Source Innovation Project of Qingdao [19-6-2-19-cg]
- National Natural Science Foundation of China [51402160]
- Natural Science Foundation of Shandong Province, China [ZR2019QEM005]
- Qingdao Postdoctoral Applied Research Project
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Lithium-sulfur batteries show potential for high-density energy storage, but face challenges due to shuttle effect and sluggish reaction kinetics. A Janus Fe3C/N-CNF@RGO electrode was developed to address these issues by providing chemisorption, catalysis, and physical barrier effects. The 3D conductive network enables fast electron transfer, leading to improved long-term stability and rate capabilities.
Lithium-sulfur batteries (LSBs) have shown great potential for application in high-density energy storage systems. However, the performance of LSBs is severely hindered by the shuttle effect and the sluggish reaction kinetics of lithium polysulfides (LiPSs). Here, a Janus Fe3C/N-CNF@RGO electrode consisting of a 1D Fe3C-decorated N-doped carbon nanofibers (Fe3C/N-CNFs) side and a 2D reduced graphene oxide (RGO) side was applied as a free-standing carrier for the Li2S6 catholyte to improve the overall electrochemical performance of LSBs. The Fe3C/N-CNF layer endows the cathode with strong chemisorption abilities for LiPSs and accelerated the redox kinetics via catalyzing the conversion of LiPSs. The 2D RGO sheets serve as a microscopic physical barrier and further resist the shuttling of LiPSs. Like a hunter's trap, behind the trap lies a net. Moreover, the 3D hierarchical conductive network based on 1D N-CNF and 2D RGO sheets enables fast electron transfer. Based on the synergetic effects of chemical immobilization, catalytic abilities, and a physical barrier in a 3D conductive network, LSBs with optimal Fe3C/N-CNF@RGO electrodes exhibit robust long-term cycling stability (a decay rate of only 0.0089% per cycle at 0.5C for 300 cycles), superior rate capabilities (821.7 mA h g(-1) at 2.0C), and stable cycling performance at high sulfur loading (6.29 mg cm(-2)). This work defines an emerging viewpoint relating to the design of novel sulfur carriers with multiple synergistic effects for application in LSBs.
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