Title:Selective Extraction of Lithium from Spent-NMC Battery Cathodes
Using Sodium Hydroxide as a Leaching Agent at Elevated
Temperatures
Volume: 17
Issue: 2
Author(s): Rohiman Ahmad Zulkipli, Indra Perdana*, Doni Riski Aprilianto, Tri Rahmawati and Rochmadi
Affiliation:
- Universitas Gadjah Mada, Chemical Engineering, Yogyakarta, 55281, Indonesia
Keywords:
Leaching, lithium, NMC battery recycling, recovery, hydrometallurgy, sodium hydroxide.
Abstract:
Introduction: The demand for lithium-ion batteries (LIBs) is rapidly increasing
due to the growth of the electronics and electric vehicle industries. Even though the batteries
are rechargeable, their storage capacity decreases, and they eventually end up being
wasted. Recycling the spent LIBs is necessary to reduce the environmental impact and utilize
the precious metals contained in the waste.
Method: The present work focuses on the selective recovery of lithium from the cathodes
of spent NMC batteries through the hydrometallurgical process using a sodium hydroxide
solution. The leaching process was carried out in 2 M and 4 M NaOH concentrations for
120 minutes at high pressure and at temperatures of 398.15 K, 423.15 K, 448.15 K, and
473.15 K. Experimental results showed that 56.53% of lithium could be recovered with
nearly 100% selectivity under the optimum leaching conditions of 473.15 K and 4 M
NaOH. The release of lithium ions was due to a combination of sodium adsorption, ion
exchange, and impregnation mechanisms.
Result: Calculation results showed that the activation energy of the lithium leaching process
was 2.1990×104 J/mol, the reaction was endothermic with enthalpy and entropy at
standard conditions (298.15 K) of 4.8936×105 J/mol and 1.4421×103 J/mol/K, respectively.
Conclusion: The present work also suggested that total lithium recovery can be increased
through a series of leaching processes.