摘要
通过湿化学法从废旧锂离子电池中回收得到Li+、Co2+的硝酸溶液,以此为钴源,与Ni(NO3)2.6H2O、Mn(NO3)2按化学计量比混合,用草酸盐共沉淀法制备草酸盐前驱体,然后按Li过量5%加入Li2CO3混合,在空气中于800～950°C煅烧15 h得LiCo1/3Mn1/3Ni1/3O2,研究了煅烧温度对材料结构、形貌以及电化学性能的影响。结果表明,900℃保温15 h制备的LiCo1/3Mn1/3Ni1/3O2正极材料,为理想的(α-NaFeO2层状结构,颗粒为大小均匀的球形,在2.5～4.3 V的电压范围内,以0.1 C的恒定电流进行充放电,其首次充放电比容量分别为194.3和150.9 mAh/g,10次循环之后的容量保持率为89.9%,放电比容量为135.0 mAh/g。
The nitrate solution of Li^＋、Co^2＋ was prepared by wet-chemical method from spent lithium ion batteries. The Li^＋、Co^2＋ solution was mixed with Ni（NO3）2·6H2O、Mn（NO3）2 according to stoichiometric proportion, the oxalate precursor was prepared by oxalate co-precipititation. LiCo1/3Mn1/3Ni1/3O2 cathode material was prepared by firing a mixture of oxalate precausor and 5% excess Li2CO3 between 800 and 950℃ for 15 h in air. Influences of calcine temperacture on structure, morphology and electrochemical properties of the cathode material were investigated and discussed. The results indicate that the sample synthesized at 900℃ and holding for 15 h has perfect α-NaFeO2 layered crystal structure and uniform particles, the charge and discharge capacities were 194.3 and 150.9 mAh/g in the voltage range of 2.8～4.3 V at 0.1 C, after 10 cycles its discharge capacity was 135.0 mAh/g and the capacity rention was 89.9%.
基金
科技部"科研院所社会公益研究专项("2004DIB5J189)
天津市自然科学基金资助项目(043606211)
