Reaction-passivation mechanism driven materials separation for recycling of spent lithium-ion batteries

Zihe Chen, Ruikang Feng, Wenyu Wang, Shuibin Tu, Yang Hu, Xiancheng Wang, Renming Zhan, Jiao Wang, Jianzhi Zhao, Shuyuan Liu, Lin Fu and Yongming Sun ()
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Zihe Chen: Huazhong University of Science and Technology
Ruikang Feng: Huazhong University of Science and Technology
Wenyu Wang: Huazhong University of Science and Technology
Shuibin Tu: Huazhong University of Science and Technology
Yang Hu: Huazhong University of Science and Technology
Xiancheng Wang: Huazhong University of Science and Technology
Renming Zhan: Huazhong University of Science and Technology
Jiao Wang: Huazhong University of Science and Technology
Jianzhi Zhao: Mirattery Co., Ltd.
Shuyuan Liu: Mirattery Co., Ltd.
Lin Fu: Huazhong University of Science and Technology
Yongming Sun: Huazhong University of Science and Technology

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Development of effective recycling strategies for cathode materials in spent lithium-ion batteries are highly desirable but remain significant challenges, among which facile separation of Al foil and active material layer of cathode makes up the first important step. Here, we propose a reaction-passivation driven mechanism for facile separation of Al foil and active material layer. Experimentally, >99.9% separation efficiency for Al foil and LiNi0.55Co0.15Mn0.3O2 layer is realized for a 102 Ah spent cell within 5 mins, and ultrathin, dense aluminum-phytic acid complex layer is in-situ formed on Al foil immediately after its contact with phytic acid, which suppresses continuous Al corrosion. Besides, the dissolution of transitional metal from LiNi0.55Co0.15Mn0.3O2 is negligible and good structural integrity of LiNi0.55Co0.15Mn0.3O2 is well-maintained during the processing. This work demonstrates a feasible approach for Al foil-active material layer separation of cathode and can promote the green and energy-saving battery recycling towards practical applications.

Date: 2023
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DOI: 10.1038/s41467-023-40369-9

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