Insights into the Mechanisms Behind Structural Repair of Spent Layered Cathode Materials for Lithium-Ion Batteries.

ABSTRACT: Structural repair is a vital step in the direct recycling of spent LiNi_xCo_yMn_zO₂ lithium-ion batteries, yet its underlying mechanisms remain insufficiently clear. Herein, the thermal solid-state structural repair of spent LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622) layered cathode material is systematically investigated. Through multiscale techniques combining XRD, XAS, and ⁶Li solid-state NMR, we identify the structural degradation in spent NCM622 and monitor both long- and short-range structural evolution during repair. Our findings reveal that degradation predominantly occurs through Ni migration into Li octahedral sites, while Co and Mn demonstrate relatively lower occupancies in the Li layer. Such occu

SUBMITTER: Liu S 

PROVIDER: S-EPMC12322646 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature