Journal
WASTE MANAGEMENT
Volume 150, Issue -, Pages 30-38Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2022.06.037
Keywords
Recycle of spent graphite; Modified low-temperature roasting; Full component recovery; Electrochemical properties
Categories
Funding
- National Natural Science Foundation of China [52174338, 51904349]
- Natural Science Foundation of Hunan Province, China [2021JJ30796]
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This study proposes an environmentally friendly and economical method to recycle spent graphite from lithium-ion batteries, resulting in high-purity graphite for battery manufacturing. The recycled graphite exhibits excellent charge-discharge performance and cycle life. Additionally, the waste generated during the process can be properly treated.
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 degrees 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.
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