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Slippery lubricant-infused porous surface (SLIPS) is a promising solution to undesired adhesion. Unfortunately, the complicated fabrication process and limited coating area block its practical applications. Herein, we report a onestep strategy to fabricate polypropylene-based SLIPS coatings through thermally induced phase separation, in which the lubricant is in situ infiltrated within a polymer network formed during cooling. The solid−liquid-phase separation process was monitored by an in situ hot-stage microscope. Such coating performs outstanding self-cleaning, anti-corrosion, and anti-bacterial performance, as well as enhanced stability of the lubricant layer because the lubricant is well adapted in the structure.

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Slippery liquid‐infused porous surfaces have received great attention in anti‐adhesion applications, and ionic liquids are selected as the infiltrated liquid in recent research due to their non‐volatility. Beyond the complicated steps, infiltrating the viscous ionic liquid within a porous structure is challenging during the conventional fabrication process. Herein, a facile method is proposed to fabricate polyurethane‐based slippery ionic‐liquid‐infused coatings in one step through a phase separation process. The solid structure grows from the ionic liquid through a liquid–liquid phases separation process. The coatings perform excellent anti‐bacterial and anti‐icing properties owing to the biocide nature, lubricity, and low freezing point of ionic liquids.