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제126회 대한화학회 학술발표회 및 총회 Recycling spent lithium ion batteries and their impurity effects

2020년 9월 8일 16시 54분 15초
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화 11시 : 10분
Environmental Energy - Electrode and Energy Storage Technology
저자 및
Sungyool Bong
School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Korea
As lithium-ion batteries continuously increase the energy market portion, recycling of Li-ion batteries (LIBs) will ask for regulations due to limited resources. With the demand increment of battery recycling, understanding of impurity is always a concern for LIB recycling since it could work in different forms corresponding to different recycling processes. In addition, as identification and development of lithium-ion battery recycling technologies can be required, understanding the role of impurities is a critical issue, which might be impacted on battery performance, material stabilization, or lifetime for recovered active materials. Herein, we confirmed that copper impurity in different forms could be applied for very different roles on the recovered NCM622. Copper metal impurity can be easily short the cell. In contrast, Copper ion impurity could act as a positive factor since this copper ion partially substituted into the Ni 2+sites for lower the cation mixing degree. These positive results clearly explain that copper impurity might be avoided and it should be controlled with optimal concentration during the recycling process for spent LIBs corresponding to the amount of its impurity.