Electrospun Nanofibers as Effective Polysulfide Trap for Advanced Lithium-Sulfur Batteries

Subcategory (under Clean Energy): Cross Cutting
Technology Readiness Level (TRL): TRL 4 - Early prototype
Technology Outline (Process Description)

In this project, fibrous cathode materials and solid-state electrolytes were developed with the use of low-cost processing techniques to overcome the persistent problem of Lithium Sulfur Batteries (LSB) and improve their electrochemical performance. This involved the fabrication of both nano and microfibers via high-throughput methods such as electrospinning, carbonization of natural biomass fibers etc. and implementing them as suitable components of the LSB cathode. Moreover, the fibers were functionalized with various polar and/or catalytic materials to improve the chemical affinity towards Lithium polysulfides. Along with the cathode, the solid electrolyte developed based on electrospun nanofibers also have shown encouraging results.

Salient Features/Advantages

  • The results obtained will lead to the development of various fibrous architectures for commercially viable LSBs. The methodologies developed during this project to fabricate various fibrous architectures for LSBs will open the door for the production of next generation flexible electronic devices that have unique advantages of excellent portability, lightweight, and conformal contact on curvilinear surfaces, owing to its ability to bend, implant and wear resistance.

Key Outcomes

  • This project delivered various fibre-based cathode architectures for LSBs among which the cathode fabricated by using both nano and microfibers have delivered a specific capacity of 804.9 mAh g−1 at 0.2 C with a capacity retention of 71.1% after 100 cycles. Even under high sulfur loading of 5.3 mg cm−2, the LSB was able to display a discharge capacity of 442.3 mAh g−1. Most of the fibrous cathodes developed in this project have shown promising cycle performance for long-cycles even above 500 cycles.

IP Protection details

  • Patent filed (Title, national/International): Nil
  • Patents Granted: Nil
  • Copyrights obtained /progress on commercialisation /Pl. specify connect with industry: Nil

Contact details (for more information)

  • Nodal Person name: Prof. Bhanu Nandan
  • Email ID: nandan@iitd.ac.in
  • Organisation name (Relevant link/web page): IIT Delhi
Supporting Photographs/Images

Organizations involved in the development (logo/name)

Indian Institute of Technology Delhi

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