2023 Fiscal Year Final Research Report
Low/no-corrosion leaching of spent lithium-ion battery cathode materials in hydrothermal water using amino acid or mixed organic acids as the leachant
| Project/Area Number |
21K12302
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 64030:Environmental materials and recycle technology-related
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| Research Institution | Tohoku University |
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Principal Investigator |
ZHENG QINGXIN 東北大学, 工学研究科, 特任助教 (30835509)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Recycling / Lithium-ion batteries / Hydrothermal leaching / Metal recovery / Acid corrosion / Glycine / Citric acid / Mixed organic acid |
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| Outline of Final Research Achievements |
In this project, the Principal Investigator aimed to explore a kind of organic acids for the hydrothermal leaching of spent lithium-ion battery (LIB) cathode materials, which can achieve high leaching efficiency and resolve the problem of acid corrosion. Based on a literature investigation and initial experiments, glycine and citric acid/glycine mixture were selected as candidate leaching agents. Finally, it was the first time to achieve the acid leaching of different types of LIB cathode materials including LiCoO2, LiNiO2, and LiMn2O4, and LiNixMnyCo1-x-yO2 (NCM), through a green process with high efficiency of about 100% and low/no acid corrosion.
During the research period, 4 peer-reviewed English papers were published in top journals such as ACS Sustainable Chemistry and Engineering, a patent was submitted, and six oral presentations and one poster presentation were delivered, including two invited presentations, at international and domestic conferences.
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| Free Research Field |
化学工学
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| Academic Significance and Societal Importance of the Research Achievements |
This research effectively eliminated the acid corrosion problem during the leaching process, significantly improving current LIB recycling methods. The results will help conserve natural resources, reduce environmental problems, ensure resource stability and security, and bring economic benefits.
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