期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 15, 页码 12799-12806出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b01546
关键词
Thermal degradation; Alkaline reaction medium; Aluminum foil separation; Defluorination; Calcium oxide
资金
- National Natural Science Foundation of China [71804085]
High-temperature heat treatment (500 degrees C) is an effective measure for decomposing the organic binder polyvinylidene fluoride (PVDF) in the cathode electrode of spent lithium-ion batteries (LIBs). However, the resulting volatilization of hydrogen fluoride not only causes equipment corrosion but also creates a potential environmental hazard. This study proposes the use of calcium oxide (CaO) as a reaction medium to eliminate the environmental impact of the thermal decomposition of PVDF in the cathode electrode of spent LIBs. The results show that with CaO as the reaction medium, the PVDF in the cathode electrode can be thermally decomposed at the lower temperature of 300 degrees C, solving the problem of separation of the cathode materials and Al foil; the separation efficiency of the cathode materials surpassed 97.1 wt %. Further characterization results confirmed that the PVDF covering the surface of the cathode electrode can be effectively decomposed and absorbed by CaO in situ, and no release of hydrogen fluoride was detected. These results indicate that the use of CaO can reduce the processing cost and avoid the release of hydrogen fluoride, providing both economic and environmental benefits. This study therefore provides a potential technical approach for the green recycling of spent LIBs.
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