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A green process for phosphorus recovery from spent LiFePO4 batteries by transformation of delithiated LiFePO4 crystal into NaFeS2
He, Kai; Zhang, Zhi-Yuan; Zhang, Fu-Shen
2020-08-05
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume395Pages:1-10
AbstractRecovery of high-content and valuable elements including phosphorus (P) is critical for recycling of spent LiFePO4 battery, but P recovery is challengeable due to the poor solubility of lithium phosphate and iron phosphate. This study compared two strategies to recover P by adopting sulfide salt to induce P dissolution, i.e., recovery of P directly from LiFePO4, and step-by-step recovery of Li then P. The results revealed that the second strategy was more efficient because of the higher recovering efficiency and selectivity. Accordingly, an acid-free process to recover P was successfully demonstrated. Li-recovery efficiency of 97.5 % was reached at a leaching time of 65 min, and nearly 100 % P-recovery efficiency was reached at 5 h. Mechanism analysis revealed that the transforming of delithiated LiFePO4 crystal to NaFeS2 was mainly responsible for P dissolution. Thermodynamic analysis and density functional theory calculation further proved the transformation reaction, and a stepwise-transformation mechanism was proposed. In addition, P was reclaimed in the form of soluble phosphate salts. The process is especially appealing due to its environmental and economic benefits for recycling spent LiFePO4 batteries.
Department固体废弃物处理与资源化实验室
KeywordSpent LiFePO4 battery Solid waste recycling Phosphorus recovery NaFeS2
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/44560
Collection固体废弃物处理与资源化实验室
Recommended Citation
GB/T 7714
He, Kai,Zhang, Zhi-Yuan,Zhang, Fu-Shen. A green process for phosphorus recovery from spent LiFePO4 batteries by transformation of delithiated LiFePO4 crystal into NaFeS2[J]. JOURNAL OF HAZARDOUS MATERIALS,2020,395:1-10.
APA He, Kai,Zhang, Zhi-Yuan,&Zhang, Fu-Shen.(2020).A green process for phosphorus recovery from spent LiFePO4 batteries by transformation of delithiated LiFePO4 crystal into NaFeS2.JOURNAL OF HAZARDOUS MATERIALS,395,1-10.
MLA He, Kai,et al."A green process for phosphorus recovery from spent LiFePO4 batteries by transformation of delithiated LiFePO4 crystal into NaFeS2".JOURNAL OF HAZARDOUS MATERIALS 395(2020):1-10.
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