期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c00814
关键词
Recovery; Spent lithium-ion battery; LiCoO2; SiCl4; Chlorination roasting
资金
- Fundamental Research Funds for the Central Universities [N2025034, N2025035, XLYC1807042]
- 111 Project [B16009]
The silicon tetrachloride-assisted roasting technique proposed in this paper efficiently recovers important substances from spent lithium cobalt oxide batteries and successfully re-synthesizes new battery materials with good performance.
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 degrees 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.
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