| 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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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | Recycling / Lithium-ion batteries / Hydrothermal leaching / Metal recovery / Acid corrosion / Glycine / Citric acid / Mixed organic acid / Mixed organic acids / Continuous / Kinetic study / Metal isolation / Mn isolation / Continuous leaching / Unreacted core model / Organic acid |
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| Outline of Research at the Start |
Metal recovery from spent lithium-ion batteries (LIBs) is an increasingly urgent topic in the world. Hydrometallurgy is the most common and industrially adopted method of metal recovery and comprises two steps of leaching and separation. Here, the applicant aims to explore an organic acid (amino acid or mixed organic acids) to achieve the efficient hydrothermal leaching of spent LIBs with low or no acid corrosion. The elimination of acid corrosion is supposed to greatly develop the method of hydrothermal leaching, improve the current leaching process, and further promote hydrometallurgy.
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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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| 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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