废旧锂离子电池负极材料石墨的再生工艺研究  

Regenerating Process of Graphite as Anode Material of Spent Lithium-Ion Battery

作　　者：刘旭[1,2] 胥桂萍 LIU Xu;XU Guiping(College of Optoelectronic Materials and Technology,Jianghan University,Wuhan 430056,China;College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]江汉大学光电材料与技术学院,湖北武汉430056 [2]北京化工大学化学工程学院,北京100029

出　　处：《化学与生物工程》2022年第2期44-47,63,共5页Chemistry & Bioengineering

基　　金：江汉大学武汉研究院2021开放性课题(IWHS20212082)。

摘　　要：用柠檬酸对废旧锂离子电池的负极材料石墨进行包覆再生,通过X-射线衍射仪、场发射扫描电子显微镜、拉曼光谱仪对包覆效果进行了评价,分析比较了不同包覆比(柠檬酸与石墨废料的质量比)对充放电性能、倍率性能、阻抗性能、循环伏安性能的影响。结果表明,柠檬酸包覆可有效修复负极材料石墨的表面结构,并大幅提高电化学性能;当包覆比为1∶10时,电化学性能最佳,首周充放电比容量达到1.5 Ah·g^(-1);放电倍率为1 C时循环20周后的放电比容量达到310 mAh·g^(-1);石墨化程度更高,阻抗更小,可达到循环使用的要求。Graphite,as an anode material of spent lithium-ion battery,was coated with citric acid,and the coating effect was evaluated by X-ray diffractometer,field emission scanning electron microscope,and Raman spectrometer.Moreover,we analyzed and compared the effect of coating ratio(mass ratio of citric acid and waste graphite)on charge-discharge performance,rate capacity,impedance performance,and cyclic voltammetry performance.The results show that citric acid coating can effectively repair the surface structure of the anode material graphite,and greatly improve the electrochemical performance.When the coating ratio is 1∶10,the electrochemical performance is the best,and the first cycle charge-discharge specific capacity can reach 1.5 Ah·g^(-1);the specific discharge capacity reaches 310 mAh·g^(-1) under discharge rate of 1 C after 20 cycles;the generated graphite has higher graphitization degree and lower impedance,indicating that it can meet the requirements of recycling.

关 键 词：废旧锂离子电池 石墨废料回收 柠檬酸包覆 再生 

分 类 号：TQ09[化学工程] TM912.9[电气工程—电力电子与电力传动]