This paper introduces a separation-free and purification-free method for directly producing lithiumLithium-rich solutions from industrial-grade mixed lithiumLithium-ionLIB batteries batteryBattery wasteLithium-ion battery. This waste containing complex components, such as lithium iron phosphateLithium iron phosphate (LFP), copperCopper foil, aluminum foil, graphiteGraphite, nickel, cobalt, and manganese, poses significant challenges for processing. However, this study offers a solution with two major innovations: the separation-free means eliminating the need for physical powder separation during pretreatment, allowing for the selective leachingSelective leaching of lithiumLithium directly from the mixed waste. The purification-free aspect is due to the exceptional leachingLeaching selectivity, producing a solution that contains almost no other metal ions besides lithiumLithium. The study investigates the use of acid and hydrogen peroxide to effectively extract lithiumLithium from six impurity elements (iron, nickel, cobalt, manganese, copperCopper, and aluminum). Under optimized conditions, the lithiumLithium leachingLeaching rate surpasses 96%, while the leachingLeaching rates of all impurities remain below 1%. This method exhibits a strong ability for lithiumLithium extraction and remarkable leachingLeaching selectivity, holding promising industrial application potential, while simplifying processes and reducing costs.