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Title: Repurposing of fruit peel waste as a green reductant for recycling of spent lithium-ion batteries
Authors: Wu, Zhuoran
Soh, Tanto
Chan, Jun Jie
Meng, Shize
Meyer, Daniel
Srinivasan, Madhavi
Tay, Chor Yong
Keywords: Engineering
Issue Date: 2020
Source: Wu, Z., Soh, T., Chan, J. J., Meng, S., Meyer, D., Srinivasan, M. & Tay, C. Y. (2020). Repurposing of fruit peel waste as a green reductant for recycling of spent lithium-ion batteries. Environmental Science and Technology, 54(15), 9681-9692.
Project: SCARCE USS-IF-2018-4 
Journal: Environmental Science and Technology 
Abstract: The development of environmentally benign hydrometallurgical processes to treat spent lithium-ion batteries (LIBs) is a critical aspect of the electronic-waste circular economy. Herein, as an alternative to the highly explosive H2O2, discarded orange peel powder (OP) is valorized as a green reductant for the leaching of industrially produced LIBs scraps in citric acid (H3Cit) lixiviant. The reductive potential of the cellulose- and antioxidant-rich OP was validated using the 3,5-dinitrosalicylic acid and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic) acid assays. Leaching parameters such as OP concentration (200 mg), processing temperature (100 °C), H3Cit concentration (1.5 M), reaction duration (4 h), and slurry density (25 g/mL) were systematically optimized to achieve 80-99% leaching efficiencies of Ni, Mn, Co, and Li from the LIB "black mass". Importantly, solid side-streams generated by the OP-enabled leaching displayed negligible cytotoxicity in three different human cell lines, suggesting that the process is environmentally safe. As a proof of concept, Co(OH)2 was selectively recovered from the green lixiviant and subsequently utilized to fabricate new batches of LiCoO2 (LCO) coin cell batteries. Galvanostatic charge-discharge test revealed that the regenerated batteries exhibited initial charge and discharge values of 120 and 103 mAh/g, respectively, which is comparable to the performance of commercial LCO batteries. The use of fruit peel waste to recover valuable metals from spent LIBs is an effective, ecofriendly, and sustainable strategy to minimize the environmental footprint of both waste types.
ISSN: 0013-936X
DOI: 10.1021/acs.est.0c02873
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles

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