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Beaded CoSe2-C Nanofibers for High-Performance Lithium-Sulfur Batteries
Jing Xu1, Juan Ao1, Yonghui Xie1
1Institute of Micro-Nano Devices and Solar Cells, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350108, China.
Nanomaterials (Basel, Switzerland)
|September 9, 2023
Summary
Researchers developed beaded nanofibers (BNFs) with carbon and cobalt diselenide (CoSe2) to enhance lithium-sulfur (Li-S) battery performance. These CoSe2/C BNFs significantly improve capacity and cycle stability by suppressing polysulfide shuttling.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density but face challenges in commercial application due to poor electrochemical performance.
- The shuttle effect of lithium polysulfides and volume changes during cycling degrade battery efficiency and lifespan.
- Advanced cathode materials are crucial for overcoming these limitations and realizing the potential of Li-S batteries.
Purpose of the Study:
- To design and synthesize novel beaded nanofibers (BNFs) composed of carbon and cobalt diselenide (CoSe2) nanoparticles for Li-S battery cathodes.
- To investigate the synergistic effects of CoSe2/C BNFs in inhibiting the shuttle effect and enhancing electrochemical performance.
- To evaluate the rate capability and long-term cycling stability of Li-S batteries utilizing the developed cathode material.
Main Methods:
- Electrospinning was employed to create the precursor nanofibers, followed by carbonization and selenization processes to form CoSe2/C BNFs.
- The synthesized CoSe2/C BNFs were characterized using various techniques to confirm their structure and composition.
- Electrochemical performance was assessed through galvanostatic charge-discharge cycling, rate capability tests, and long-term cycling stability measurements.
Main Results:
- The CoSe2/C BNFs exhibited a synergistic effect of physical adsorption and chemical catalysis, effectively suppressing the shuttle effect of lithium polysulfides.
- The three-dimensional conductive network of the BNFs facilitated rapid electron and ion transport and accommodated volume changes.
- The CoSe2/C BNFs-S cathode achieved a high reversible discharge specific capacity of 919.2 mAh g⁻¹ at 0.1 C and demonstrated excellent cycle stability with a capacity decay rate of 0.05% per cycle over 600 cycles at 1 C.
Conclusions:
- The CoSe2/C BNFs provide an effective strategy for designing high-performance sulfur-based cathodes for Li-S batteries.
- The combination of beaded carbon nanofibers and polar metal selenides offers a promising pathway for improving Li-S battery technology.
- This work highlights the potential of tailored nanostructures and catalytic materials in advancing next-generation energy storage solutions.
