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Mackinawite iron sulfide (M-FeS), a rarely reported conversion-type anode material, undergoes repeated volume changes during the charge–discharge process, which eventually induces fast electrochemical degradation. However, commonly used strategies to mitigate volume changes using hybridization with carbon materials require high temperatures above 500 °C, which is limited for M-FeS due to its low thermal stability. Here, a novel and facile strategy to hybridize M-FeS with a carbon material using a one-step hydrothermal method under low-temperature conditions (125 °C) is reported. Carbon dots with functional groups were served as nucleation sites, and hybridized with M-FeS. The hybrid material (M-FeS@C) comprised micron-sized M-FeS particles wrapped with a carbon shell and exhibited improved structural stability during the charge–discharge process when tested for sodium-ion storage; stable …