LiFePO_(4)锂离子电池关键材料的湿法回收  

Wet recovery of main materials of LiFePO_(4)Li-ion battery

作　　者：李云霞 万亚锋 王金涛 吕正中 LI Yun-xia;WAN Ya-feng;WANG Jin-tao;LYU Zheng-zhong(Hubei Jinquan New Materials Co.,Ltd.,Jingmen,Hubei 448000,China)

机构地区：[1]湖北金泉新材料有限公司,湖北荆门448000

出　　处：《电池》2023年第6期692-696,共5页Battery Bimonthly

摘　　要：废旧磷酸铁锂(LiFePO_(4))锂离子电池经破碎分选后制得黑粉,对黑粉采取湿法回收及再生,其中,锂、铁、磷的浸出率(回收率)可达97%以上。对浸出液采取化学沉淀法除铜、铝,铁粉置换法除铜,可将铜质量分数降至0.0001%以下,采用硫酸铵化学沉淀,可将铝质量分数降至0.0006%,达成深度除杂效果。除杂后的精制溶液可合成电池级无水磷酸铁及碳酸锂,并通过高温固相法制备LiFePO_(4)正极材料。制备的扣式电池以0.1 C在2.00~3.75 V循环,充放电比容量分别为162.96 mAh/g、159.31 mAh/g,首次循环的库仑效率为97.76%。The spent lithium iron phosphate(LiFePO_(4))Li-ion battery was crushed and sorted to get black powder.The black powder was recovered and regenerated by wet method,the leaching(recovery)rate of lithium,iron and phosphorus could reach more than 97%.Chemical precipitation method was used to remove copper and aluminum from the leaching solution.The iron powder replacement method could reduce the copper content to less than 0.0001%,aluminum content could be reduced to 0.0006%by using ammonium sulfate chemical precipitation,achieving a deep impurity removal effect.After impurity removal,the refined solution was used to synthesize battery grade anhydrous iron phosphate and lithium carbonate.LiFePO_(4)cathode material was further synthesized by high temperature solid phase method.The charge-discharge specific capacities of the button cell were 162.96 mAh/g and 159.31 mAh/g respectively after cycling at 0.1 C in 2.00-3.75 V,the Coulombic efficiency of the initial cycle was 97.76%.

关 键 词：锂离子电池 磷酸铁锂(LiFePO_(4)) 湿法回收 磷酸铁 碳酸锂 再生材料 资源化利用 

分 类 号：TM912.9[电气工程—电力电子与电力传动]