Preparation of lithium-ion battery anode materials from graphitized spent carbon cathode derived from aluminum electrolysis  

作　　者：Zhihao Zheng Mingzhuang Xie Guoqing Yu Zegang Wu Jingjing Zhong Yi Wang Hongliang Zhao Fengqin Liu 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China [2]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第11期2466-2475,共10页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52274346).

摘　　要：Graphitized spent carbon cathode(SCC)is a hazardous solid waste generated in the aluminum electrolysis process.In this study,a flotation-acid leaching process is proposed for the purification of graphitized SCC,and the use of the purified SCC as an anode material for lithium-ion batteries is explored.The flotation and acid leaching processes were separately optimized through one-way experiments.The maximum SCC carbon content(93wt%)was achieved at a 90%proportion of−200-mesh flotation particle size,a slurry concentration of 10wt%,a rotation speed of 1600 r/min,and an inflatable capacity of 0.2 m^(3)/h(referred to as FSCC).In the subsequent acid leaching process,the SCC carbon content reached 99.58wt%at a leaching concentration of 5 mol/L,a leaching time of 100 min,a leaching temperature of 85°C,and an HCl/FSCC volume ratio of 5:1.The purified graphitized SCC(referred to as FSCC-CL)was utilized as an anode material,and it exhibited an initial capacity of 348.2 mAh/g at 0.1 C and a reversible capacity of 347.8 mAh/g after 100 cycles.Moreover,compared with commercial graphite,FSCC-CL exhibited better reversibility and cycle stability.Thus,purified SCC is an important candidate for anode material,and the flotation-acid leaching purification method is suitable for the resourceful recycling of SCC.

关 键 词：graphitized spent carbon cathode hazardous solid waste flotation acid leaching lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]