Graphitic carbon has been emerged as one of the most promising anode materials for potassium-ion batteries (PIBs) due to its moderate theoretical specific capacity, high electrical conductivity, and outstanding chemical stability. However, the structure of graphitic carbon usually experiences irreversible damage during the charge and discharge process, primarily due to the large radius of potassium ion. In contrast to the traditional preparation methods, we develop a low-carbon approach to obtain graphitic carbon with larger lattice spacing via a rapid chemical conversion between CO