Sustainable and facile method for the selective recovery of lithium from cathode scrap of spent LiFePO4 batteries
Sustainable and facile method for the selective recovery of lithium from cathode scrap of spent LiFePO4 batteries
复制标题
从废旧磷酸铁锂电池正极废料中选择性回收锂的可持续且简便的方法
DOI：
10.1021/acssuschemeng.9b00404
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发表时间：
2019
影响因子：
8.4
通讯作者：
Chengyan Wang
中科院分区：
文献类型：
--
作者：
Jialiang Zhang;Juntao Hu;Yubo Liu;Qiankun Jing;Cheng Yang;Yongqiang Chen;Chengyan Wang
从废旧磷酸铁锂电池中回收锂对防止资源枯竭和环境污染具有重要意义。本研究中，“盐包水”电解液在LiFePO4电池中的应用启发了我们开发一种新的方法，通过过硫酸钠（Na2S2O8）氧化LiFePO4为FePO4，从废旧LiFePO4电池中选择性回收锂。考察了几个因素对锂浸出率的影响。结合热力学分析和XRD、XPS等表征手段对浸出机理进行了探讨。在室温下，用0.05倍过量的Na_2S_2O_8在20 min内可选择性浸出99%以上的Li。高浸出率的原因是氧化浸出过程中固体结构稳定，不被破坏。然后提出了一种闭环工艺来回收整个废旧LiFePO4电池，并最终成功地制备了高纯度的Li2CO3（99 wt %）。该工艺经济可行，环境友好，具有很大的潜力，为工业规模回收废旧磷酸铁锂电池。
Lithium recovery from spent LiFePO4batteries is significant to prevent resource depletion and environmental pollution. In this study, the employment of “water in salt” electrolyte in LiFePO4battery enlightened us to develop a novel method for the selective recovery of lithium from spent LiFePO4batteries through oxidizing LiFePO4to FePO4with sodium persulfate (Na2S2O8). Effect of several variables on the Li leaching efficiency was investigated. Additionally, combined thermodynamic analysis and characterization of XRD, XPS were employed to investigate the leaching mechanism. More than 99% of Li can be selectively leached in 20 min at ambient temperature with only 0.05 times excess of Na2S2O8. The high leaching efficiency can be ascribed to the stability and without destruction for the solid structure during the oxidation leaching. A closed-loop process was then proposed for recycling entire spent LiFePO4batteries, and finally high purity Li2CO3(99 wt %) was successfully prepared. The process is economically feasible and environmentally friendly and has great potential for the industrial-scale recycling of spent LiFePO4batteries.