Lithium-Sulfur Battery

Technology #17699

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Inventors
Professor Yet-Ming Chiang
Department of Materials Science and Engineering, MIT
External Link (dmse.mit.edu)
Xinwei Chen
Department of Materials Science and Engineering, MIT
Jiayan Luo
Department of Materials Science and Engineering, MIT
Managed By
Christopher Noble
MIT Technology Licensing Officer - Clean and Renewable Energy
Patent Protection

Systems and Methods of Preparing Lithium Sulfur Electrode Using Sacrificial Template

PCT Patent Application Filed

Applications

Lithium-sulfur batteries have applications ranging from portable electronics to electric vehicles.

Problem Addressed

Sulfur-based batteries provide an alternative to conventional lithium based batteries with unstable electrolytes. Sulfur-based batteries have a high theoretical specific capacity of 1,672 mAh/g and energy density of 2600 Wh/kg. However, practical applications of sulfur-based batteries remain a challenge due to their low utilization and capacity fading. This technology overcomes this by creating a sulfur composite electrode with high density and loading of active material.

Technology

This technology uses three different materials: sulfur, bis-(trifluoromethane)sulfonamide lithium salt (LiTFSI), and carbon nanotubes. All three materials are mixed by mechanical grinding before being pressed into 3/8in. diameter pellets under 100MPa. The pellets are then heated under argon at 160oC for 24h. The resulting cathode composite consists of (40 wt%), LiTFSI (10 wt%) and CNT (50 wt%) and has a specific capacity of 867 mAh/g. The LiTFSI-S/CNT electrode also has a Coulombic efficiency of >93% over 50 cycles.

Advantages

  • Increases battery cyclability
  • Increases battery capacity