Impact of Silicon Impurity on the Hydrometallurgical Recovery of NCM622 Cathode

Zheng, Yadong; Yang, Zhenzhen; Wang, Yan

doi:10.1149/1945-7111/ad9ccd

Impact of Silicon Impurity on the Hydrometallurgical Recovery of NCM622 Cathode

Journal Article · Wed Dec 18 00:00:00 EST 2024 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ad9ccd· OSTI ID:2571200

Zheng, Yadong ^[1]; ^[2]; ^[1]

Worcester Polytechnic Institute, MA (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)

Hydrometallurgy is one of the best approaches to date for recycling LIBs due to its high efficiency, low energy usage, and industrial scalability. However, impurities have always been a thorny issue because they could have unintended impacts on the recovered cathode materials. This research marks the first systematic investigation into the influence of silicon impurity on the LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622) cathode obtained from hydrometallurgical recycling. Here we find that silicon nanoparticles will be nucleated at the center of the precursor particles during co-precipitation synthesis, and the silicon core will slowly dissolve in the surrounding ammonia, creating a special hollow structure in the particle. More importantly, the dissolution of silicon impurity will eventually lead to the deposition of silicates in the cathode material, which is an unfavorable result. Test data indicate that NCM622 cathode with 5 at% silicon has a capacity of 148.8 mAh g⁻¹ after 100 cycles at 1/3 C, approximately 10 mAh g⁻¹ lower than the virgin. Despite being relatively mild, the adverse influence of silicon impurity in hydrometallurgical recycling still requires attention.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2571200

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 12 Vol. 171; ISSN 1945-7111; ISSN 0013-4651

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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