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A SiCl4-Assisted Roasting Approach for Recovering Spent LiCoO2 Cathode
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-06-23 , DOI: 10.1021/acssuschemeng.2c00814 Mengting Li 1 , Beilei Zhang 1 , Xin Qu 2 , Muya Cai 2 , Dongxu Liu 1 , Fengyin Zhou 2 , Hongwei Xie 1 , Shuaibo Gao 2 , Huayi Yin 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-06-23 , DOI: 10.1021/acssuschemeng.2c00814 Mengting Li 1 , Beilei Zhang 1 , Xin Qu 2 , Muya Cai 2 , Dongxu Liu 1 , Fengyin Zhou 2 , Hongwei Xie 1 , Shuaibo Gao 2 , Huayi Yin 1, 2
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Efficiently recycling end-of-life lithium-ion batteries (LIBs) has been pursued in recent years to reduce energy consumption and secondary waste. In this paper, silicon tetrachloride (SiCl4)-assisted roasting was developed to recover LiCl, CoCl2, and Co3O4 from spent lithium cobalt oxide (LiCoO2) batteries. At 500 °C and a SiCl4/LiCoO2 mass ratio of 3:1, 95.6% of Co was recovered as CoCl2 and 98.4% of Li was recovered as LiCl. When the mass ratio was 0.7:1, 24.6% of Co was in the form of CoCl2, and the remaining was Co3O4, accompanied by the Li leaching rate of 95.6%. LiCoO2 resynthesized from recycled Li2CO3 and Co3O4 exhibits good electrochemical performance, with a capacity of over 142.5 mAh g–1 at 1C and a capacity retention rate of 93% after 100 cycles. According to the EverBatt model analysis, the SiCl4-assisted roasting method exhibits lower energy consumption and greenhouse gas emission, as well as more considerable revenue. Since SiCl4 is a byproduct of the polysilicon production process, the SiCl4-assisted chlorination at medium temperatures not only reduces the cost, but also achieves the disposal of SiCl4 and spent LIBs in a green manner.
中文翻译：
一种用于回收废 LiCoO2 阴极的 SiCl4 辅助焙烧方法
近年来，人们一直在寻求有效回收报废锂离子电池 (LIB)，以减少能源消耗和二次废物。本文开发了四氯化硅 (SiCl 4 ) 辅助焙烧从废钴酸锂 (LiCoO 2 ) 电池中回收 LiCl、CoCl 2和 Co 3 O 4 。在500℃和3:1的SiCl 4 /LiCoO 2质量比下，95.6%的Co以CoCl 2的形式回收，98.4%的Li以LiCl的形式回收。当质量比为0.7:1时，24.6%的Co为CoCl 2，其余为Co 3 O 4，伴随着95.6%的锂浸出率。由回收的Li 2 CO 3和Co 3 O 4再合成的LiCoO 2表现出良好的电化学性能，在1C时容量超过142.5 mAh g -1，100次循环后容量保持率为93%。根据EverBatt 模型分析，SiCl 4辅助焙烧法具有更低的能耗和温室气体排放，以及更可观的收益。由于SiCl 4是多晶硅生产过程中的副产品，中温SiCl 4辅助氯化不仅降低了成本，而且实现了SiCl的处置。4并以绿色方式使用 LIB。
更新日期：2022-06-23
中文翻译：
一种用于回收废 LiCoO2 阴极的 SiCl4 辅助焙烧方法
近年来，人们一直在寻求有效回收报废锂离子电池 (LIB)，以减少能源消耗和二次废物。本文开发了四氯化硅 (SiCl 4 ) 辅助焙烧从废钴酸锂 (LiCoO 2 ) 电池中回收 LiCl、CoCl 2和 Co 3 O 4 。在500℃和3:1的SiCl 4 /LiCoO 2质量比下，95.6%的Co以CoCl 2的形式回收，98.4%的Li以LiCl的形式回收。当质量比为0.7:1时，24.6%的Co为CoCl 2，其余为Co 3 O 4，伴随着95.6%的锂浸出率。由回收的Li 2 CO 3和Co 3 O 4再合成的LiCoO 2表现出良好的电化学性能，在1C时容量超过142.5 mAh g -1，100次循环后容量保持率为93%。根据EverBatt 模型分析，SiCl 4辅助焙烧法具有更低的能耗和温室气体排放，以及更可观的收益。由于SiCl 4是多晶硅生产过程中的副产品，中温SiCl 4辅助氯化不仅降低了成本，而且实现了SiCl的处置。4并以绿色方式使用 LIB。
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