1,1′-Sulfonyldiimidazole (SDI) is a heterocyclic sulfonyl compound used as an advanced functional additive in lithium-ion and lithium-metal battery electrolytes. SDI plays a key role in engineering stable and robust interphases—particularly on lithium-metal and high-capacity anodes—by promoting the formation of sulfur- and nitrogen-rich SEI layers. These interphases improve ion transport, suppress dendrite formation, and enhance cycle life under aggressive cycling conditions. Its bifunctional structure allows SDI to engage in both physical and chemical stabilization of the electrode–electrolyte interface.

Offered at high purity, SDI is a promising additive for next-generation battery systems requiring durability, safety, and performance.

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