Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202218672
Keywords
Li-Rich Cathode; Single-Crystalline; Spent LiNi0 88Co0 095Al0 025O2; Upcycling
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We upcycle spent polycrystal LiNi0.88Co0.095Al0.025O2 (S-NCA) to high value-added single-crystalline and Li-rich cathode materials using a simple LiOH-Na2SO4 eutectic molten salt strategy. The in situ X-ray diffraction technique and paratactic experiments prove the evolution process and excessive Li occupation. The regenerated NCA (R-NCA) exhibits enhanced electrochemical performances.
With ever-increasing pursuit for high-value output in recycling spent lithium-ion batteries (LIBs), traditional recycling methods of cathodes tend to be obsolete because of the complicated procedures. Herein, we first upcycle spent polycrystal LiNi0.88Co0.095Al0.025O2 (S-NCA) to high value-added single-crystalline and Li-rich cathode materials through a simple but feasible LiOH-Na2SO4 eutectic molten salt strategy. The in situ X-ray diffraction technique and a series of paratactic experiments record the evolution process of upcycling and prove that excessive Li occupies the transition metal (TM) layers. Beneficial from the single-crystalline and Li-rich nature, the regenerated NCA (R-NCA) exhibits remarkably enhanced electrochemical performances in terms of long-term cyclability, high-rate performance and low polarization. This approach can also be successfully extended to other cathode materials e.g., LiNixCoyMnzO2 (NCM) and mixed spent NCAs with varied degree of Li loss.
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