Materials sustainability has becoming an urgent issue in the rapidly growing lithium-ion batteries (LIBs) market. Among different cell chemist tries, layered oxide LiNi_xCo_yMn_zO₂ (0<x,y,z<1, x+y+z=1) or NCM is the dominating cathode material in high energy LIBs, which have degradation issues after cycling due to the Li loss and phase changes. Directly resolving these issues to generate new cathodes can not only reduce the high cost but also prevent environmental pollution from disposal of used LIBs. However, currently there is no effective approach to tackle this challenge. In this talk, we demonstrate the successful regeneration of degraded NCM cathodes using a novel particle-to-particle approach. Using non-destructive methods, nearly ideal stoichiometry, low cation mixing and high phase purity were achieved in the regenerated NCM particles, which offer high specific capacity, cycling stability and rate capability reaching pristine materials. Our work represents a simple yet efficient approach to directly regenerate high-performance NCM cathodes with distinct advantages over traditional hydrometallurgical methods and builds an important foundation for the sustainable manufacturing of energy materials.