Metal extraction from spent lithium-ion batteries (LIBs) at high pulp density by environmentally friendly bioleaching process. (20th January 2021)

• Record Type: Journal Article
• Authors: Roy, Joseph Jegan; Madhavi, Srinivasan; Cao, Bin
• Is Part Of: Journal of cleaner production. Volume 280(2021)Part 2
• Publication Date: 2021-01-20
• Subjects: Bioleaching -- Acidithiobacillus ferrooxidans -- Lithium-ion batteries -- High pulp density -- Replenishing -- Biogenic H2SO4; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.124242
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Spent lithium-ion batteries (LIBs) are more hazardous due to the presence of several toxic metals such as cobalt, lithium, nickel, manganese, etc. as well as electrolytes such as LiPF6, LiBF4, or LiClO4 . However, these spent LIBs are the secondary source of metals that can be extracted and reused in many ways to decrease their potential environmental risks. Metal extraction from the mixture of LiCoO2 -based spent LIBs at a high pulp density by bioleaching is challenging because of microbial inhibition due to high metal toxicity and substrate (iron) limitation. In the present study, we have investigated the bioleaching of a mixture of LiCoO2 -based LIBs at high pulp density (100 g/L) using cost-efficient autotrophic bacteria Acidithiobacillus ferrooxidans . By increasing the biogenic H2 SO4 production in the culture media, as well as replenishing the bacterial culture for three cycles, we could recover 94% cobalt and 60% lithium in 72 h at 100 g/L pulp density. The X-ray diffraction (XRD), Scanning electron microscope (SEM), and Inductively coupled plasma - optical emission spectrometry (ICP-OES) analysis of LIB powder before and after bioleaching confirmed that more than 90% cobalt leached out from the LIB powder. This bioleaching process is an environmentally friendly way of extracting metals from the mixture of LIBs in gadgets and can be used for all types of spent LIBs. Graphical abstract: Image 1 Highlights: Bioleaching of LIBs with high cobalt (222.5 g/kg of black mass) at high pulp densities. Heterogeneous LIB black mass mimicking industrial battery recycling used for bioleaching. High level of biogenic H2 SO4 and Fe 3+ ions produced in the bacterial culture used for bioleaching. Highest metal recovery of 94% Co and 60.3% Li obtained in 72 h at 100 g/L (S/L). Beneficial when scaling up the process.