Issue 24, 2022

An enhanced strategy based on the pyrolysis of bean dregs for efficient selective recovery of lithium from spent lithium-ion batteries

Abstract

With the vigorous development of the lithium-ion battery (LIB) industry, the scarcity and non-renewability of lithium resources mean that the efficient selective recovery of Li from the spent LIBs turns progressively essential. Herein, by utilizing bean dregs (BDs) as a green reducing agent, an enhanced recycling strategy combining biomass reduction roasting and carbonated water leaching was explored. During the roasting process, the pyrolysis of BDs promoted the decomposition of the cathode material and converted it into Ni, Co, MnO, and Li2CO3. According to the thermodynamic analysis and the physical characterization of roasted products, a lattice collapse model was exploited to illuminate the thermochemical reaction mechanisms under the synergistic reduction effect of gases and biochar. Moreover, the parameters of the carbonated water leaching process were optimized by the response surface method (RSM) and the central composite design (CCD), and the leaching rate of Li was further enhanced. Economic assessment results indicate that this recycling strategy enhances the total profits by reducing energy and reagent consumption and increasing the recovery efficiency of Li. Overall, based on the pyrolysis of BDs, the enhanced strategy provides new perspectives and expectations for the future spent LIB recycling industry.

Graphical abstract: An enhanced strategy based on the pyrolysis of bean dregs for efficient selective recovery of lithium from spent lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
12 sept. 2022
Accepted
11 nov. 2022
First published
01 déc. 2022

Green Chem., 2022,24, 9552-9564

An enhanced strategy based on the pyrolysis of bean dregs for efficient selective recovery of lithium from spent lithium-ion batteries

T. Lin, Y. Wang, S. Jin, D. Mu, J. Zhang, J. Liang and C. Dai, Green Chem., 2022, 24, 9552 DOI: 10.1039/D2GC03439E

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