Printing Nanoporous Ultrathin Membranes for Lithium-Sulfur Batteries

RPI ID:
2019-021-401

Innovation Summary:
This technology provides a graphene oxide (GO) printed coating for separator membranes in lithium-sulfur (Li–S) batteries. The printed GO layers block polysulfide migration, addressing the ‘shuttle effect’ that reduces Coulombic efficiency and cycle life. Unlike traditional coatings, this method produces ultrathin layers (<20 nm) with pore sizes below 1 nm, minimizing ionic resistance while enhancing selectivity. The coating process is compatible with commercial printing equipment, offering scalability and reduced production costs. GO dispersions can be tuned by chemical modification to optimize performance. These coated separators increase cycle stability, improve capacity retention, and enable higher efficiency operation. The technology has implications for extending range and lifespan of electric vehicles and grid storage systems. It represents a low-cost, scalable approach to improving advanced battery technologies.

Challenges/Opportunities:
Uniform deposition of nanoscale GO coatings at large scale is challenging and requires precision printing. Durability of coatings under repeated charge/discharge cycles must be validated. Competition exists from other polysulfide suppression methods, such as electrolyte additives and cathode modifications. Nevertheless, the approach offers a low-cost route using abundant materials. Opportunities exist to commercialize Li–S batteries for electric vehicles, drones, and aerospace where high energy density is critical. Partnerships with battery OEMs could accelerate market entry. Further R&D could expand applications into next-generation lithium-metal batteries. There is also potential to tailor coatings for hybrid chemistries in solid-state systems.

Key Benefits:
✓ Suppresses polysulfide shuttle effect
✓ Ultrathin coatings (<20 nm) reduce resistance
✓ Scalable, low-cost printing method
✓ Compatible with commercial separator membranes
✓ Improved Coulombic efficiency and cycle life

Applications:
• Lithium-sulfur batteries
• Electric vehicles
• Drones and aerospace energy systems
• Grid storage
• Next-gen lithium-metal batteries

Keywords:
Lithium-sulfur battery, graphene oxide, separator, shuttle effect, nanocoating, printing

Intellectual Property:
Published US Patent Application No. 17/297,184