Selective recovery of lithium from spent NCM lithium-ion batteries powders with ammonium sulfate roasting
- 点击次数：
- DOI码：10.1016/j.seppur.2025.134155
- 发表刊物：SEPARATION AND PURIFICATION TECHNOLOGY
- 关键字：Spent lithium-ion batteries；
Selective lithium extraction；
Ammonium sulfate roasting；
Conversion mechanism；
Lithium fluoride
- 摘要：The traditional hydrometallurgical process for the recovery of spent NCM lithium-ion batteries (NCM-LIBs) powders adopts a "Mn-Co-Ni-Li" stepwise separation and extraction strategy. However, Li tends to disperse during the separation of Mn-Co-Ni, resulting in low Li recovery. This study aims to precisely control the phase transformation of valuable metals via ammonium sulfate roasting, ensuring that Li in LiCo0.5Ni0.2Mn0.3O2 (NCM523) is fully converted into water-soluble Li2SO4, while Ni, Co and Mn are primarily reduced to acid-soluble CoO and (NiO)(m)(MnO)(n). Following water leaching, similar to 91 % Li was preferentially extracted, while the leaching ratios of Ni, Co and Mn were only similar to 0 %, similar to 0% and similar to 16 %, respectively. similar to 9 % Li that failed to be leached was attributed to unconverted LiF in the spent NCM-LIBs powders. A novel tert-octyl phenyl phosphate (PTOPP) extractant enabled the deep removal of Mn from the Li-containing water-leaching solution. The extraction ratio of Mn exceeded 99 % through 3-stage countercurrent extraction. Li retained in the raffinate was precipitated with NH4HF2 to prepare battery-grade LiF (99.98 %). In this paper, a process was developed for closed-loop selective recovery of Li from spent NCM-LIBs powders, along with the conversion of transition metals into readily acid-leachable low-valent oxides.
- 论文类型：期刊论文
- 论文编号：134155
- 学科门类：工学
- 一级学科：冶金工程
- 文献类型：J
- 卷号：377
- 字数：9
- 是否译文：否
- 发表时间：2025-12-19
- 收录刊物：SSCI、SCI、EI
