(中南大学 冶金科学与工程学院，长沙410083)
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。
关键字: LiCoO2；回收；合成；放电容量；循环性能
LiCoO2 recycled from incisors bound of Li-ion batteries
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
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.
Key words: LiCoO2; recycle; synthesis; discharge performance; cycling performance
