This study investigates the recycling of lithium-ion batteries, focusing on combined pyrometallurgical and hydrometallurgical methods. Pyrometallurgical techniques are effective for processing large volumes of waste, while subsequent hydrometallurgical treatment of slags face challenges due to high silicon leaching. The introduction of the dry digestion method, combining powdery slags with concentrated sulphuric acid and water, addresses this issue by reducing silicon leaching from 50% to 1.25%. This approach improves the recovery efficiency of lithium and aluminium and enhances the practicality of hydrometallurgical recycling, supporting more effective material recovery and contributing to circular economy goals.