Regeneration of graphite from spent lithium‐ion batteries as anode materials through stepwise purification and mild temperature restoration

Author:

Ji Shaowen1,Zhang Anlong1,Hua Weiming1,Yan Shuxuan2,Chen Xiangping34ORCID

Affiliation:

1. School of Environmental Science and Engineering Shaanxi University of Science & Technology Xi'an Shaanxi China

2. College of Chemistry and Chemical Engineering Central South University Changsha Hunan China

3. College of Chemistry and Chemical Engineering Hunan Normal University Changsha Hunan China

4. National & Local Joint Engineering Laboratory for New Petro‐chemical Materials and Fine Utilization of Resources Hunan Normal University Changsha Hunan China

Abstract

AbstractGraphite is one of the most widely used anode materials in lithium‐ion batteries (LIBs). The recycling of spent graphite (SG) from spent LIBs has attracted less attention due to its limited value, complicated contaminations, and unrestored structure. In this study, a remediation and regeneration process with combined hydrothermal calcination was proposed to remove different impurities as value‐added resources from SG. This study focuses on the application of different removal methods for different impurity metals by hydrothermal and acid leaching under different conditions for the removal of Cu, Li, Co, Mn, and Ni from SG. Then, mild‐tempreture calcination of SG was performed to remove residual organic compounds. The regenerated graphite (RG) was found to have a better morphology structure and increased pore volume, which is more favorable for the embedding and desorption of lithium (Li) in graphite. In terms of electrochemical performance, the first discharge‐specific capacity of RG at 0.5 C is 359.40 mAh/g, with a retention of 353.49 mAh/g after 100 cycles (retention rate of 98.36%). This study can be a green and efficient candidate for the regeneration of graphite from spent lithium‐ion batteries as anode material by reduced restoration temperature, with different metal resources as by‐products.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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