Waste management (New York, N.Y.) · 2024
Improved recovery of lithium from spent lithium-ion batteries by reduction roasting and NaHCO3 leaching.
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Liu Wenke, Qin Qingwei, Zhang Hailin, Zhao Wei, Chen Xing, Xiong Jiachun, Han Yunwu, Zheng Shili, Zhang Chunguang, Li Guangqiang, Li Ping
Аннотация
Lithium supply risk is increasing and driving rapid progress in lithium recovery schemes from spent lithium-ion batteries (LIBs). In this study, a facile recycling process consisting mainly of reduction roasting and NaHCO3 leaching was adopted to improve lithium recovery. The Li of spent LiNixCoyMn1-x-yO2 powder were converted to Li2CO3 and LiAlO2 with the reduction effect of C and residual Al in the roasting process. NaHCO3 leaching was utilized to selectively dissolve lithium from Li2CO3 and water-insoluble LiAlO2. The activation energy of NaHCO3 leaching was 9.31 kJ∙mol-1 and the leaching of lithium was a diffusion control reaction. More than 95.19 % lithium was leached and recovered as a Li2CO3 product with a purity of 99.80 %. Thus, this approach provides a green path to selective recovery of lithium with good economics.