New & Alternative Chemistries

A New Sulfur Iodide Molecular Crystal, S9.3I, As Solid-State Li-S Battery Cathode To Address Sulfurʼs Poor Conductivity And Interfacial Instability MATERIAL PROPERTIES

EC PERFORMANCE

Pristine S

Synthesis: The material is synthesized by grinding S and I2 powders, followed by heating to 80°C. The I2 molecules are integrated into the S lattice, forming a unique crystalline structure. Key Properties: S9.3I exhibits semiconductor-level conductivity 5.9 10−7 S cm−1 at 25°C) and features a low melting point 65°C, enabling self-healing of damaged interfaces through periodic remelting.

Electrochemical Advantages: 87% capacity retention at 400 cycles. High specific capacities 811.8 1211.3 mAh g−1) over a range of temperatures 25100°C.

Source: Zhou, J., Holekevi Chandrappa, M.L., Tan, S. et al. Healable and conductive sulfur iodide for solid-state Li–S batteries. Nature 627, 301305 2024. https://doi.org/10.1038/s4158602407101-z

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