<p>Using waste LiFePO₄ battery cathode materials as raw materials, a CH₃COOH-H₂O₂ system was used for selective leaching separation and resource recovery of valuable iron and lithium elements in waste LiFePO₄ battery cathode materials. This paper mainly investigates the optimization process of an acid leaching system for leaching experiments, the recovery process of lithium ions by sodium carbonate and the comprehensive performance analysis of the prepared battery. In the leaching process, it is found that the leaching of lithium is controlled by a mixture of surface chemical reaction and diffusive mass transfer process. The lithium iron phosphate was subsequently synthesized by carbothermal reduction of the obtained valuable materials and the battery performance was tested and analyzed, and it was found that the lithium iron phosphate synthesized at Li/Fe = 1 and roasted at 700°C for 8&#xa0;h had the best electrochemical performance.</p>