<p>Catalytic gasification of biochar is a promising technology for the synthesis of syngas, which can effectively solve the problem of CO₂ emissions. This research centers on the impact of diverse catalysts (cobalt oxides and lithium carbonate) fabricated from spent lithium batteries on the catalytic activity within the CO₂ gasification reaction of biochar. The structural and property alterations of the samples were analyzed through XRD, XPS, BET, and SEM. The experimental results indicate that the mixed catalyst composed of cobalt oxides and lithium carbonate exerts a synergistic promotion effect during the catalytic gasification process. This is attributed to the enhanced fluidity and dispersion of the catalyst in the active zone, while more reactive oxygen species are generated on the oxygen vacancy, thereby conferring it with excellent catalytic performance for CO₂ gasification. Among them, the mixed catalyst demonstrated the optimal catalytic performance, and the maximal CO release rate significantly increased from 3.9 to 43.67&#xa0;mL·min⁻¹·g⁻¹. Based on the experimental and characterization results, it is suggested that the metal catalyst serves as an intermediate to capture and adsorb CO₂, deliver oxygen, and resolve CO as the primary reaction mechanism for CO₂ gasification from biochar during the gasification process. This research provides significant insights into the comprehensive utilization of spent lithium battery cathode materials and efficient CO₂ gasification processes involving biochar.</p>