Akademik Veri Yönetim Sistemi
21st International Metallurgy and Materials Congress, İstanbul, Türkiye, 6 - 08 Ekim 2022, ss.121, (Tam Metin Bildiri)
Global lithium-ion battery (LIB) market has increased due to rapid growth of
electric vehicle demands and energy storage industry. Besides the advantages
of LIBs such as large energy density, high efficiency, high voltage, long cycle
life, low self-discharge rate and being environmentally friendly; LIBs contain
several toxic chemical components to disallow storage or inceneration
for dispose. Also, the metals contained in the battery have an important
economic impacts, metallurgical values and critical primary sources due to
several reasons. In this study, 90 spent LIBs were collected and completely
discharged in 1:1 CH3COOH:H2O solution for 24 hours. Then, components of
the batteries were dismantled manually and cathode active powder striped
from aluminium foil for further experiments. XRD, TG/DTA, ICP-MS analyses
were carried out to characterize the cathode active powder which is the raw
material of this study. The XRD pattern of the cathode powder shows the
characteristic peaks of typical NMC materials (LiCo1/3Ni1/3Mn1/3O2). Leaching
processes were performed in water-heated flask with 500 mL capacity with
mechanical strirrer. Leaching experiments were carried out in H2SO4 medium
in the range of 0.5-3 M concentration, 25-80oC temperature and 250 rpm
for 3 hours. Samples were taken from the reactor at 5-180 minutes and the
samples were analyzed by ICP-MS to calculate leaching efficiency of Li,
Co, Mn and Ni. When process was completed, the solution in the flask was
filtered to separate the leach residues and the solution. To investigate the
leaching efficiency depending on the process parameters, ICP-MS analyses
were carried out. According to ICP-MS analyses, the leaching efficiency of Li,
Co, Mn and Ni, were obtained. TG/DTA and XRD analyses were performed to
investigate morphological and chemical properties of the leach residue.