Regeneration and utilization of graphite from the spent lithium-ion batteries by modified low-temperature sulfuric acid roasting
Regeneration and utilization of graphite from the spent lithium-ion batteries by modified low-temperature sulfuric acid roasting
复制标题
改良低温硫酸焙烧废旧锂离子电池石墨的再生利用
DOI：
10.1016/j.wasman.2022.06.037
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Qi-fan ZHONG
中科院分区：
文献类型：
--
作者：
Zhen-hua ZHANG;Xiang-dong ZHU;Huiliang Hou;Lei TANG;Jin XIAO;Qi-fan ZHONG
Recycling spent graphite in spent lithium-ion batteries (LIBs) is crucial for lacking high-quality graphite and environmental protection. Here, an environmentally friendly and economical modified method based on sulfate roasting was proposed to recycle spent graphite via low temperature roasting at 250 °C with sodium fluoride as an assistant additive. Recycling leads to graphite with a high purity of 99.55 % and chemical structures for energy storage. Batteries manufactured in regenerated graphite deliver a high initial charge capacity of 333.9 mAh/g with an initial columbic efficiency of 85.71% and excellent capacity retention of 91.2% after 400 cycles. In addition, the waste produced in the method could be well treated, and by-products 177 g of sodium sulfate would be collected per 1 kg spent graphite and NaF, equivalent to 78.95% of the added amount obtained through wastewater and exhaust gas, respectively. The regenerated sodium fluoride will be re-applied to the recovery spent graphite. The loop-closed method shows great promise for the industrial-scale recycling of spent graphite for energy storage applications.
