Invention Reference Number
Oak Ridge National Laboratory has developed composite electrodes composed of polymer-bound carbon nanofibers and carbon black for use in sodium polysulfide flow batteries. This technology supports long-duration energy storage with earth-abundant, cost-effective materials and enhanced electrochemical performance, directly advancing the DOE’s Grid Modernization Initiative by providing resilient, large-scale energy storage that smooths renewable generation and accelerates grid recovery after disturbances. By substituting critical minerals with plentiful sodium and carbon, it also fulfills DOE goals to fortify supply chains and strengthen national energy security.
Description
This invention involves the fabrication of composite electrodes using carbon nanofibers (CNFs), carbon black (CB), and sodium carboxymethyl cellulose (Na-CMC) as a binder. The mixture is deposited onto carbon paper to form a mechanically stable and electrochemically active layer suitable for sodium polysulfide batteries. Various CNF/CB/binder ratios were evaluated to determine the optimal composition for sulfur conversion efficiency and long-term cycling stability. A balance of mechanical integrity with improved charge capacity was identified. The binder ensures structural cohesion and prevents CNF dispersion into the electrolyte. Scanning electron microscopy and electrochemical testing confirmed that binder distribution and CB content significantly affect active material accessibility and battery performance. The electrodes demonstrated stable cycling over 100 cycles, suggesting their potential applicability in non-aqueous sodium polysulfide redox flow battery configurations.
Benefits
- Utilizes low-cost, earth-abundant materials
- Enhances electrochemical stability and sulfur utilization
- Supports long-duration energy storage through improved electrode/membrane assembly design
Applications and Industries
- Non-aqueous redox flow batteries for grid energy storage
- Sodium-sulfur battery systems for energy integration
- Strengthens grid resilience
- Secures supply chains
- Cuts costs while boosting performance
Contact
To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.
