期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 5, 页码 2271-2279出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c08213
关键词
spent lithium-ion batteries; recycling; sulfation roasting; milder conditions; leaching
资金
- National Natural Science Foundation of China [51874269, 52004263, 51934006]
- Research fund of Shanghai Polytechnic University [EGD19YJ0053]
- Gaoyuan Discipline of Shanghai-Environmental Science and Engineering (Resource Recycling Science and Engineering)
- Key Program of Chinese Academy of Sciences [ZDRW_CN_2020-1]
- Key Program of Innovation Academy for Green Manufacture, Chinese Academy of Sciences [IAGM-2019-A15]
The novel sulfation roasting-water leaching process offers a more efficient and environmentally friendly way to recover valuable metals from spent LiCoO2 batteries, with the addition of graphite promoting the conversion of LiCoO2 under milder conditions. The study demonstrates that almost all of the Li and Co can be successfully recovered, highlighting the impact of various parameters on the recovery process.
Recycling of spent lithium-ion batteries (LIBs) has attracted ever-growing attention owing to the scarcity of critical metals and potential environmental risk. Sulfation roasting, as traditional technology, is considered uneconomical and not environmentally friendly due to tremendous consumption of energy and emission of waste gases such as SO2 or SO3. Hereby, a novel and cleaner sulfation roasting-a water leaching process is proposed to recover valuable metals from spent LiCoO2 (LCO) batteries. It is found that sulfur can be recirculated thoroughly in the form of SO42- without the emission of SOx during the sulfation roasting process. Besides, the addition of graphite can promote the conversion of LiCoO2 under relatively milder conditions than those of traditional sulfation roasting. To further understand the conversion mechanism of LCO, the effects of various parameters including roasting temperature, roasting time, the mass ratio of carbon, and the molar ratio of H2SO4 during the recovery of Li and Co were investigated. Approximately, 92% of the global Li can be recovered as Li2CO3 with a purity as high as 99.76%, and almost 100% of Co can be recovered in the form of CoSO4 by sulfuric acid leaching. This work proposes a practicable and promising strategy for recycling valuable metals from spent LCO batteries. Meanwhile, the synergic mechanisms on carbon and sulfur for enhancing the selectivity of metal extraction are revealed.
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