University of Pittsburgh researchers have developed a novel electrospinning methodology to create high-performance sulfur electrodes for lithium-sulfur batteries. These electrodes, made from electro-spun sulfur wires coated with a thin layer of conducting polymer, address key challenges in lithium-sulfur battery technology, including poor electronic conductivity, volumetric expansion, and polysulfide dissolution. The resulting sulfur cathodes exhibit high electronic conductivity, minimal volumetric expansion, improved rate capabilities, and superior cycling ability, making them ideal for use in thin lithium-sulfur batteries for small-scale mobile devices.
Description
The innovative sulfur electrodes are fabricated using an electrospinning process that produces yarn-like sulfur fibers (1-7 μm) with up to 30 wt% sulfur. These fibers are then coated with a conducting polymer layer, which acts as a physical barrier to the liquid lithium electrolyte, significantly reducing polysulfide dissolution. This design enhances the electronic conductivity and cycling stability of the sulfur cathodes. The textile-mat-like morphology of the electrodes, consisting of layers of sulfur wires and conducting polymers, further contributes to their high performance.
Applications
• Lithium-sulfur batteries for small-scale mobile devices
• Energy storage solutions for textiles and wearable electronics
• High-performance batteries for portable electronics
Advantages
The Mg alloy-based fixation devices are degradable, avoiding long-term complications and the need for removal surgery. They stimulate local bone formation, enhancing healing and load-bearing capabilities. The unique tapered thread form promotes controlled degradation and Mg ion release, while bone-like mechanical properties reduce stress shielding. The devices are radiolucent for clear imaging and user-friendly with self-tapping screws for easy surgical procedures.
Invention Readiness
The technology has been developed into prototypes, demonstrating high performance in lithium-sulfur batteries. The electrodes are ready for further development and commercialization, with potential applications in various energy storage solutions for mobile and wearable devices.
IP Status
https://patents.google.com/patent/US20180047978A1
