The cathode materials in retired sodium-ion batteries and lithium-ion batteries are collected, disassembled, and extracted. Through methods such as lithium or sodium supplementation, co-precipitation, and high-temperature solid phase re-sintering, the recycled materials can regain a good crystal structure, so that the waste battery materials can regain electrochemical activity and be returned to battery manufacturing. This can significantly reduce carbon emissions throughout the life cycle, effectively alleviate the pressure of external dependence on key metal resources, and achieve sustainable development of the battery industry.