Pyrolysis mechanism of spent LIBs separator and catalytic effect of metal foils: Insights from combined experimental and DFT studies
•Pyrolysis characteristics and product distribution of separators were investigated.•Pyrolysis mechanism of separator was examined based on DFT calculation.•Different metal foils' catalytic effects on separator pyrolysis were investigated. The rapid development of new energy technologies has fa...
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Published in | Polymer degradation and stability Vol. 237; p. 111326 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.07.2025
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Subjects | |
Online Access | Get full text |
ISSN | 0141-3910 |
DOI | 10.1016/j.polymdegradstab.2025.111326 |
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Abstract | •Pyrolysis characteristics and product distribution of separators were investigated.•Pyrolysis mechanism of separator was examined based on DFT calculation.•Different metal foils' catalytic effects on separator pyrolysis were investigated.
The rapid development of new energy technologies has facilitated the widespread adoption of electric vehicles, but has also led to a significant increase in the generation of spent lithium-ion batteries (LIBs). Extensive research has been conducted on the recycling of spent LIBs with most studies focusing on the recovery of the anode and cathode materials, electrolytes, and current collectors. Research on the recycling of battery separators remains limited. Pyrolysis technology has been shown to enable the efficient recovery of organic components and has already been applied in the recycling of spent LIB separators. However, existing studies reveal that the mechanisms underlying separator pyrolysis are not well understood, and the role of endogenous metals (Cu and Al foil) in the pyrolysis process remains unclear. Density Functional Theory (DFT) calculations have been extensively employed in mechanistic investigations of organic compound pyrolysis and metal-catalyzed reactions. In this context, the commonly used polypropylene (PP) separator was selected as the subject of this study. Various thermal analysis devices and kinetic methods were employed to investigate the pyrolysis characteristics, pyrolysis kinetics, distribution of pyrolysis products, and the influence of metal foils on the pyrolysis process of PP separators. Through DFT calculations and wave function analysis, the pyrolysis mechanism of PP separators and the catalytic role of metal foils in the PP pyrolysis process were elucidated. |
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AbstractList | •Pyrolysis characteristics and product distribution of separators were investigated.•Pyrolysis mechanism of separator was examined based on DFT calculation.•Different metal foils' catalytic effects on separator pyrolysis were investigated.
The rapid development of new energy technologies has facilitated the widespread adoption of electric vehicles, but has also led to a significant increase in the generation of spent lithium-ion batteries (LIBs). Extensive research has been conducted on the recycling of spent LIBs with most studies focusing on the recovery of the anode and cathode materials, electrolytes, and current collectors. Research on the recycling of battery separators remains limited. Pyrolysis technology has been shown to enable the efficient recovery of organic components and has already been applied in the recycling of spent LIB separators. However, existing studies reveal that the mechanisms underlying separator pyrolysis are not well understood, and the role of endogenous metals (Cu and Al foil) in the pyrolysis process remains unclear. Density Functional Theory (DFT) calculations have been extensively employed in mechanistic investigations of organic compound pyrolysis and metal-catalyzed reactions. In this context, the commonly used polypropylene (PP) separator was selected as the subject of this study. Various thermal analysis devices and kinetic methods were employed to investigate the pyrolysis characteristics, pyrolysis kinetics, distribution of pyrolysis products, and the influence of metal foils on the pyrolysis process of PP separators. Through DFT calculations and wave function analysis, the pyrolysis mechanism of PP separators and the catalytic role of metal foils in the PP pyrolysis process were elucidated. |
ArticleNumber | 111326 |
Author | Yuan, Haoran Wu, Yufeng Zhao, Lijuan Li, Bin Tao, Ran Gu, Jing Chen, Yong |
Author_xml | – sequence: 1 givenname: Ran surname: Tao fullname: Tao, Ran organization: Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China – sequence: 2 givenname: Yufeng surname: Wu fullname: Wu, Yufeng organization: Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China – sequence: 3 givenname: Lijuan surname: Zhao fullname: Zhao, Lijuan organization: Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China – sequence: 4 givenname: Bin surname: Li fullname: Li, Bin email: thlibin2024@126.com organization: Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China – sequence: 5 givenname: Haoran surname: Yuan fullname: Yuan, Haoran organization: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China – sequence: 6 givenname: Jing surname: Gu fullname: Gu, Jing organization: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China – sequence: 7 givenname: Yong surname: Chen fullname: Chen, Yong organization: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China |
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Keywords | Lithium-ion batteries (LIBs) Pyrolysis Separators Density functional theory (DFT) Recycle |
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SubjectTerms | Density functional theory (DFT) Lithium-ion batteries (LIBs) Pyrolysis Recycle Separators |
Title | Pyrolysis mechanism of spent LIBs separator and catalytic effect of metal foils: Insights from combined experimental and DFT studies |
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