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Interface-reinforced high-capacity fiber cathode for wearable Li-S batteries
Lei Huang1, Tianzhu Zhou1, Siyu Zhu2
1School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.
National Science Review
|September 20, 2024
Summary
Fiber-shaped lithium-sulfur (Li-S) batteries offer flexible power for smart textiles. A novel composite cathode using Ti3C2Tx MXene and nanosulfur-polyvinylpyrrolidone (nanoS-PVP) effectively suppresses polysulfide shuttling, enhancing battery lifespan and performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Fiber-shaped lithium-sulfur (Li-S) batteries are promising for wearable electronics due to their high energy density and flexibility.
- However, challenges like polysulfide shuttling and capacity decay limit their practical application.
- Developing stable interfaces in fiber electrodes is crucial for improving battery performance and longevity.
Purpose of the Study:
- To design and fabricate a fiber-shaped composite cathode with enhanced interfacial stability for Li-S batteries.
- To investigate the synergistic effects of Ti3C2Tx MXene and polyvinylpyrrolidone (PVP) in mitigating polysulfide shuttling.
- To evaluate the electrochemical performance and mechanical flexibility of the developed fiber-shaped Li-S battery.
Main Methods:
- Fabrication of a composite cathode by implanting nanosulfur-polyvinylpyrrolidone (nanoS-PVP) particles into few-layer Ti3C2Tx.
- Coating the composite material onto aluminum fiber current collectors.
- Electrochemical testing, including cycling stability, rate capability, and performance under deformation and varying temperatures.
Main Results:
- The Ti3C2Tx /nanoS-PVP@Al cathode demonstrated excellent cycling stability with 92.8% capacity retention after 1000 cycles at 1 C.
- High linear capacity (22.9 mAh m⁻¹) and high-rate capacity (556.2 mAh g⁻¹ at 2.0 C) were achieved.
- The composite cathode exhibited superior polysulfide adsorption and suppressed the shuttle effect, leading to improved electrode integrity and fast kinetics.
- The fiber-shaped Li-S battery operated effectively under mechanical stress and temperature variations.
Conclusions:
- The developed Ti3C2Tx /nanoS-PVP composite cathode effectively addresses interfacial issues in fiber-shaped Li-S batteries.
- This advanced electrode design significantly enhances cycling performance, rate capability, and mechanical flexibility.
- The fiber-shaped Li-S battery shows great potential for integration into smart textiles and powering electronic devices.
