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Carbon capture and storage stand as a pivotal technology in the battle against global climate change. The development of economically viable CO₂ capture materials, coupled with the recycling of solid wastes, poses a significant challenge in the pursuit of carbon neutrality. Herein, we propose a process to synthesize a promising high-temperature sorbent, Li₄SiO₄, using spent lithium-ion batteries and iron tailings. Li₄SiO₄ synthesized under optimal process conditions demonstrates exceptional CO₂ capacity and cycle stability (0.25 g/g, 100 cycles), with a preparation cost merely amounting to 1/7 of traditional methods, rendering it industrially feasible. Moreover, elucidating the intricate relationship between impurity elements in the feedstock and the CO₂ capture capacity of the adsorbent holds considerable significance in guiding material synthesis strategies. A Systematic evaluation of solid waste purity and …