Kinetics study and recycling strategies in different stages of full-component pyrolysis of spent LiNixCoyMnzO2 lithium-ion batteries. (1st January 2023)

• Record Type: Journal Article
• Authors: Tao, Ren; Xing, Peng; Li, Huiquan; Cun, Zhigen; Wang, Chenye; Ma, Shengyue; Sun, Zhenhua
• Is Part Of: Waste management. Volume 155(2023)
• Page Start: 8
• Page End: 18
• Publication Date: 2023-01-01
• Subjects: Spent LiNixCoyMnzO2 battery -- Pyrolysis kinetics -- Reaction stages -- In situ analysis -- Recycling strategy; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2022.10.033
• Languages: English
• ISSNs: 0956-053X

Abstract

Graphical abstract: Highlights: Full-component pyrolysis kinetics of spent NCM LIBs were first studied. The pyrolysis mechanisms were investigated through in situ analysis. Kinetics models fitting was applied in different pyrolysis stages. Selective recycling strategies for spent NCM LIBs were proposed. Abstract: Full-component pyrolysis has been proven to be a prospective method for the disposal of organic matters and the cathode material reduction of spent LiNix Coy Mnz O2 (NCM) lithium-ion batteries (LIBs). However, the kinetics of the full-component pyrolysis of spent NCM LIBs is still unclear. This work represents the first attempt to study the kinetics of different stages of full-component pyrolysis of NCM LIBs based on isoconversional method to guide the recycling of spent LIBs. Pyrolysis process was divided into four stages in accordance to the main weight loss temperature ranges and the classical Kissinger–Akahira–Sunose and Flynn–Wall–Ozawa kinetics models were employed to calculate the activation energy (E) in each stage. The main physicochemical reactions were clarified though in situ analysis, and the average E in the four stages was determined: (I) The volatilization of electrolytes occurred in the temperature range of 100–200 °C with the E of 98.6 kJ/mol. (II) The decomposition of organic matters and the preliminary reduction of cathode material transpired in the temperature range of 400–500 °C with the E of 227.2 kJ/mol. (III) The further reduction of NiO and CoO occurred from 650 to 800 °C with the E of 258.8 kJ/mol. (Ⅳ) The reduction of MnO took place from 850 to 1000 °C with the E of 334.9 kJ/mol. The recycling strategies based on full-component pyrolysis of spent NCM LIBs was accordingly proposed. During pyrolysis, the cathode material was gradually reduced and the pyrolytic products can be controlled through temperature regulation.