CO₂-derived carbon materials have emerged as highly promising cathode hosts due to their sustainable origin and tunable physicochemical properties. Produced through the conversion of carbon dioxide, these porous carbons possess high surface areas and well-developed pore structures, enabling efficient sulfur dispersion and fast ion/electron transport. Moreover, their tailored surface functionalities—achieved through doping or structural design—can strongly interact with lithium polysulfides, effectively mitigating the shuttle effect and improving cycling stability. By combining environmental benefit with electrochemical performance, CO₂-derived carbon frameworks offer a compelling strategy for advancing Li–S battery technologies. 

CO₂-derived carbon materials are engineered into functional interlayers to address key challenges in Li–S batteries, including sluggish redox kinetics and the polysulfide shuttle effect. Generated through CO₂ reduction, these free-standing porous frameworks provide high surface area and hierarchical structure for efficient ion transport and LiPS confinement. Molecular catalysts embedded in the carbon matrix further promote redox conversion, enhancing sulfur utilization and cycling stability. By integrating sustainable carbon with catalytic functionality, this approach effectively improves both the performance and durability of lithium–sulfur battery systems.