Delamination of NCM Electrode by Elctrochemical Distortion of Crystal Structure

Abstract

Challenges such as limited resources, fluctuating resource pricing, and various regulations induce development of spent battery recycling market. Across the recycling process, sustainability remains a critical consideration, particularly in the case of crushing, which generates dust and toxic gases, hindering progress towards global carbon neutrality objectives. Therefore, the implementation of eco- friendly electrode scrap delamination processes is imperative. However, conventional delamination methods often result in the generation of aluminium impurities, compromising the performance of the recycled cathode. To address these challenges, we have introduced the cathode crystal structure transformation strategy through electrochemical discharging, which facilitates delamination by inducing physical distortion of the cathode. Our novel strategy offers several advantages, including energy generation during discharge. Utilizing the binder dissolution method that minimizes environmental impact makes our approach environmentally friendly. Additionally, facile, and highly efficient delamination is achievable with minimal energy consumption through physical distortion of the cathode. Furthermore, the recycled cathode exhibits high performance due to the absence of aluminium current collector damage and impurities. This recovered cathode material is suitable for direct recycling or upcycling to single crystal.