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The demand for lithium-ion batteries in applications for transportation and energy storage is leading to significant pressure on critical metal reserves, whereas end-of-life batteries create an increasing waste management issue. This work offers a scalable, low-cost recycling method through a cooperative strategy involving ammonium chloride-assisted processing, battery sorting, statistical optimization, and recovery of secondary materials, reducing metal separation costs and increasing metal recovery efficiency. Microwave-assisted roasting was explored as an energy-efficient alternative to conventional heating, resulting in reduced processing times and associated costs. The produced liquid waste and the consumption of reagents were minimized using statistical optimization via design of experiments for enhanced recovery rates of metals beyond 90 %. The recovered materials were pristine battery-grade materials. The developed Mn_xNi_yCo_zCO₃-based asymmetric supercapacitors exhibited outstanding electrochemical performance, compared to those synthesized from commercial precursors, with a specific capacitance, energy density, and power density of 97 F/g, 34.5 Wh/kg, and 598.5 W/ kg, respectively. Environmental investigations revealed reduced emissions, while the feasible regeneration of reagents and the valorization of valuable byproducts improved the process sustainability, ensuring industrial scalability while adhering to the principles of the circular economy.