【作者】 刘云建； 胡启阳； 李新海； 王志兴； 郭华军； 彭文杰；

【Author】 LIU Yun-jian HU Qi-yang LI Xin-hai WANG Zhi-xing GUO Hua-jun PENG Wen-jie (School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China)

【机构】 中南大学冶金科学与工程学院；

【摘要】 研究了一种从锂离子蓄电池正极片的边角料中直接回收钴酸锂的新工艺。先用二甲基乙酰胺（DMAC）浸泡正极片,将 LiCoO₂从铝箔上剥离,再在高温下除去正极中的聚偏氟乙烯（PVDF）和碳粉等杂质。然后添加不同的锂盐（Li₂CO₃、LiOH·H₂O 和 LiAc·2H₂O）调节回收粉末中的 Li 与 Co 的量比为1.00,再在850℃下焙烧12 h 得到最终产品。用扫描电子显微镜（SEM）和 X 射线衍射（XRD）分析技术对得到的样品进行微观形貌与晶相结构的研究。研究结果表明,添加 Li₂CO₃合成的 LiCoO₂层状结构发育最为完善,其首次放电容量和循环性能也最好:在 3.0～4.3 V 进行充放电,首次放电容量达到160 mA·h/g,经30次循环以后,仍有150 mA·h/g。更多还原

【Abstract】 A new LiCoO₂ recovery technology from Li-ion battery was studied.LiCoO₂ was peeled off the Al foil with dimethyl acetamide（DMAC）,and then the polyvinylidene fluoride（PVDF） and carbon powders in the active material were eliminated by high temperature calcining.And then the Li₂CO₃,LiOH·H₂O and LiAc·2H₂O were added into the recycled powders to adjust the molar ratio of Li to Co to 1.00.The new LiCoO₂ was obtained by calcining the mixture at 850℃ for 12 h in the air.Structure and morphology of the recycled powders and resulted sample were observed by XRD and SEM technique,respectively.The layered structure of the LiCoO₂ synthesized by adding Li₂CO₃ is best with the characteristics as cathode material in terms of charge-discharge capacity and cycling performance.The first discharge capacity is 160 mA·h/g from 3.0 V to 4.3 V.The discharge capacity after cycled 30 times is still 150 mA·h/g.更多还原