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New insights in the leaching kinetics of cathodic materials in acidic chloride media for lithium-ion battery recycling

Abstract : Leaching reactions in hydrochloric acid of several cathodic materials used in lithium-ion batteries were investigated between 25 °C and 82 °C. The dissolution rate increased as follows: NMC811 (LiNi0.8Mn0.1Co0.1O2) > NMC622 (LiNi0.6Mn0.2Co0.2O2) >> NMC532 (LiNi0.5Mn0.3Co0.2O2) > NMC111 (LiNi1/3Mn1/3Co1/3O2). The dissolution of lithium is faster than that for nickel, cobalt and manganese. Data analysis demonstrated that NMC dissolution is always a two-step process. In the first step, NMC was transformed very quickly into a new lithium-defficient phase. This phase was subsequently dissolved during a second-rate limiting step. No significant impact of the solid/liquid ratio on the leaching kinetics was observed as far as the solid-liquid ratio remained below the stochiometric composition. Finally, a shrinking core model and a first-order rate law were used to investigate the leaching kinetics of the second rate-limiting step, which is the main step involved during NMC digestion in hydrochloric acid.
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https://hal.univ-lorraine.fr/hal-03297024
Contributor : Alexandre Chagnes <>
Submitted on : Friday, July 23, 2021 - 9:52:46 AM
Last modification on : Saturday, July 24, 2021 - 3:47:13 AM

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Antônio Braga de Souza, Wen Xuan, Antônio de Souza Braga, Chloé Korbel, Alexandre Chagnes. New insights in the leaching kinetics of cathodic materials in acidic chloride media for lithium-ion battery recycling. Hydrometallurgy, Elsevier, 2021, 204, pp.105705. ⟨10.1016/j.hydromet.2021.105705⟩. ⟨hal-03297024⟩

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