Spent graphite regeneration:Exploring diverse repairing manners with impurities-catalyzing effect towards high performance and low energy consumption  

作　　者：Yu Dong Zihao Zeng Zhengqiao Yuan Bing Wang Hai Lei Wenqing Zhao Wuyun Ai Lingchao Kong Yue Yang Peng Ge 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China [2]Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450001,Henan,China [3]Shenzhen Xinmao New Energy Technology Co.,LTD,Shenzhen 518100,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第4期656-669,共14页能源化学（英文版）

基　　金：financially supported by National Natural Science Foundation of China(52374288,52204298);Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2022QNRC001);National Key Research and Development Program of China(2022YFC3900805-4/7);Hunan Provincial Education Office Foundation of China(No.21B0147);Collaborative Innovation Centre for Clean and Efficient Utilization of Strategic Metal Mineral Resources,Found of State Key Laboratory of Mineral Processing(BGRIMM-KJSKL-2017-13)。

摘　　要：Spent battery recycling has received considerable attention because of its economic and environmental potential.A large amount of retired graphite has been produced as the main electrode material,accompanied by a detailed exploration of the repair mechanism.However,they still suffer from unclear repair mechanisms and physicochemical evolution.In this study,spent graphite was repaired employing three methodologies:pickling-sintering,pyrogenic-recovery,and high-temperature sintering.Owing to the catalytic effect of the metal-based impurities and temperature control,the as-obtained samples displayed an ordered transformation,including the interlayer distance,crystalline degree,and grain size.As anodes of lithium ions batteries,the capacity of repaired samples reached up to 310 mA h g^(-1)above after 300loops at 1.0 C,similar to that of commercial graphite.Meanwhile,benefitting from the effective assembly of carbon atoms in internal structure of graphite at>1400℃,their initial coulombic efficiency were>87%.Even at 2.0 C,the capacity of samples remained approximately 244 mA h g^(-1)after 500 cycles.Detailed electrochemical and kinetic analyses revealed that a low temperature enhanced the isotropy,thereby enhancing the rate properties.Further,economic and environmental analyses revealed that the revenue obtained through suitable pyrogenic-recovering manners was approximately the largest value(5500$t^(-1)).Thus,this study is expected to clarify the in-depth effect of different repair methods on the traits of graphite,while offering all-round evaluations of repaired graphite.

关 键 词：Spent graphite regeneration REPAIR Temperature treatment 

分 类 号：X705[环境科学与工程—环境工程] TQ127.11[化学工程—无机化工]