Grafting Ionic Moiety to Sulfur for Lithium-Sulfur Battery

Embodiments described herein relate generally to lithium sulfur batteries and methods of producing the same. As described herein, preventing coarsening of sulfur during the well-known melt-diffusion processing of cathodes allows a high areal capacity of 10.7 mAh/cm2 at current density of 3.4 mA/cm2 (C-rate of 1/5 h−1). The addition of a lithium salt, such as LiTFSI, prior to melt-diffusion can prevent coarsening of molten sulfur and allows creation of a sulfur electrode with a high concentration of triple-phase junctions for electrochemical reaction. In some embodiments, approximately 60-70% utilization of the theoretical capacity of sulfur is reached at a high loading (e.g., greater than 7.5 mg S/cm2). The electrodes are prepared in lean-electrolyte environment of 3 mlelectrolyte/gsulfur (˜70 vol % of electrolyte in the electrode) for high areal capacity in Li—S batteries.

Researchers

Xinwei Chen / Jiayan Luo / Yet-Ming Chiang

Departments: Department of Materials Science and Engineering
Technology Areas: Chemicals & Materials: Nanotechnology & Nanomaterials / Energy & Distribution: Electrochemical Devices

  • systems and methods of preparing lithium sulfur electrode using sacrificial template
    Patent Cooperation Treaty | Published application
  • systems and methods of preparing lithium sulfur electrode using sacrificial template
    United States of America | Granted | 10,319,989

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