폐 리튬이온전지의 양극활물질로부터 유가금속 회수에 관한 연구

Abstract

Recently, with the development of the industry, the usage of portable electronic devices is increasing greatly, and the demand of batteries is also increasing. Among them, lithium-ion batteries are the most widely used in small-sized, mobile phones and notebook, PC because of their high operating voltage and higher energy density than other batteries. Lithium-ion batteries are expected to be used in electric vehicles and energy storage mid- to large-sized battery markets, and the demand will continue to increase, and the market size is expected to increase steadily.

The importance of the recycling of photovoltaic modules is increasing and many studies are being conducted on the recovery of the valuable resources from the spent photovoltaic module and the recycling of them worldwide. However, there are not many studies conducted on the recovery of the valuable metals from the spent PV ribbon in the photovoltaic module. Therefore, the recovery and recycling of the valuable metals from the PV ribbon in the spent photovoltaic module is expected to make great contribution to the localization of the economic resources.

In this study, the recovery of valuable metals in the cathode active material was studied by separating lithium and cobalt from the cathode active material through heat treatment on CO2 gas condition, washing and reduction of the cathode active material. The optimum temperature condition in the heat treatment on CO2 condition was 700∼800℃. Through this process, Li2CO3 and CoO could be separated from each other and Li2CO3 and CoO could be recovered by washing. The recovered CoO was recovered by reduction process in the H2 gas atmosphere. Finally, the recovered Co powder had a purity of 96% and an average particle size of 26.41μm. It is expected that it will contribute to localization of raw materials when applied to industry by environmentally friendly and simple metal recovery method.