2026-06-01T17:13:26Z https://icatplus.esrf.fr/oaipmh/request

oai:icatplus.esrf.fr:inv/2064091584 2025-04-29T08:11:35.087Z

4.2 EI 10.15151/ESRF-ES-2064091584 Guanghan ZHU Guanghan Zhu Guanghan ZHU Guanghan Zhu Zhi CHENG Zhi Cheng Zhi CHENG Zhi Cheng Xin DENG Xin Deng Xin DENG Xin Deng Feng Ryan WANG Feng Ryan Wang 0000-0002-2475-606X Feng Ryan WANG Feng Ryan Wang 0000-0002-2475-606X RACHEL NICKEL Rachel Nickel 0000-0002-8179-6295 Tongjiang LI Tongjiang Li Tongjiang LI Tongjiang Li Example Institute 2028 Data from large facility measurement 2025-04-23T06:00:00Z/2025-04-28T06:00:00Z 2025-04-28T06:00:00Z I CC-BY-4.0 In light of environmental protection and resource reutilization, efficiently recycling lithium-ion batteries has become a key issue. In the spent ternary cathode (SNCM523), the oxidation states, symmetry, spin states, and coordination structures of Ni and Co elements undergo significant changes. Specifically, the reduction of Ni³⁺ (d7) and Co³⁺ (d6) oxidation states lead to an increase in unpaired electrons in the eg orbitals, which enhances the super-exchange interaction between Ni²⁺-O-Ni³⁺ and Ni²⁺-O-Co²⁺, thereby exacerbating the Li⁺/Ni²⁺ cation mixing. Traditional XAS provides limited information on transition metal compounds' symmetry, spin, and covalency. In this study, we employ L3-edge RIXS to investigate the evolution of Ni and Co elements during the regeneration of SNCM523, thereby contributing to the rational design of more efficient recycling strategies for SNCM523.