Enhanced electrochemical performance of the fluidization separation graphite powders from waste power lithium-ion batteries by phenolic resin carbon coated

• Published in: Powder technology Vol. 411; p. 117921
• Main Authors: Shi, Changliang, Zhang, Silong, Jiang, Zhendong, Sun, Haozhi, Zhang, Chuanxiang, Xue, Fengfeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2022
• Subjects: Electrochemical performance; Fluidization separation; Graphite powders; Phenolic resin carbon coated; Waste lithium-ion batteries; Electrochemical performance; Waste lithium-ion batteries; Phenolic resin carbon coated; Graphite powders; Fluidization separation
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2022.117921

The recycling of waste lithium batteries (LIBs) is important for the healthy development of the LIBs industry. In this work, a column fluidized bed was designed to recover graphite powder from waste LIBs, and the phenolic resin-coated recovered graphite powder composites ware prepared by liquid-phase impregnation-carburization method, which effectively repaired the pores and defects on the surface of recycled graphite powders. The composites exhibited better Li storage performance than the recovered graphite powders. When the current density was 0.05 A/g, the composite obtained at 5% phenolic resin coating displayed a high reversible capacity of 451.0 mAh/g and an initial coulombic efficiency of 68.0%. The specific capacity was maintained at 131.9 mAh/g at a higher current density 1.0 A/g, the reversible capacity gradually increased from 464.4 to 546.1 mAh/g after 100 cycles at a current density of 0.1 A/g, indicating outstanding rate performance and excellent cycling stability. [Display omitted] •Recovery and reuse graphite powders from waste lithium batteries is studied.•A column fluidized bed can recover the grade of graphite powders with 96.42%•Phenolic resin carbon coating technology can repair the pores and defects.•Repaired graphite powders have a high capacity and first coulomb efficiency.