废旧锂离子电池负极片的硫酸浸出回收研究  

Recycling of negative electrode sheets of spent lithium ion batteries by sulfuric acid leaching

作　　者：杨生龙 杨凯雲 范小萍 黄有国[1,2] 刘葵 YANG Sheng-long;YANG Kai-yun;FAN Xiao-ping;HUANG You-guo;LIU Kui(School of Chemistry and Pharmaceutical Sciences,Guangxi Normal University,Guilin Guangxi 541004,China;Guangxi Key Laboratory of Low Carbon Energy Materials,Guangxi Normal University,Guilin Guangxi 541004,China)

机构地区：[1]广西师范大学化学与药学学院,广西桂林541004 [2]广西师范大学广西低碳能源材料重点实验室,广西桂林541004

出　　处：《电源技术》2020年第3期364-366,376,共4页Chinese Journal of Power Sources

基　　金：广西重点研发计划项目(桂科AB17129011)。

摘　　要：废旧锂离子电池负极片中含有铜、锂和石墨,对其回收具有一定的经济价值。采用硫酸溶液作为浸出剂,研究了硫酸浓度、浸出时间、浸出温度对负极片中锂的浸出以及石墨与铜箔分离的影响。结果表明,在浸出时间为5 min、硫酸浓度为0.9 mol/L时,铜箔与负极石墨可以完全分离,铜箔以金属的形式回收;在浸出温度为40℃、硫酸浓度为1.8moL/L、浸出时间为50 min、固液比60 g/L时,石墨中的锂几乎全部浸出进入溶液中,可实现锂与石墨的完全分离。The negative electrode sheet of spent lithium ion battery contains copper,lithium and graphite,which has an economic value if being recycled.In this paper,the sulfuric acid solution was used as the leaching agent to recycle copper,lithium and graphite simultaneously.The effects of concentration of sulfuric acid solution,leaching time and temperature on the leaching of lithium,and the recovery of graphite and copper foil were investigated.The results show that,when the leaching time is 5 min and the concentration of sulfuric acid solution is 0.9 mol/L,the copper foil and the anode graphite can be completely separated,and the copper foil is recovered in the form of metal.When the leaching temperature is 40℃,the concentration of sulfuric acid is 1.8 mol/L,the leaching time is 50 min and the solid-liquid ratio is 60 g/L,almost all of the lithium in the graphite is leached into the solution,and the complete separation of lithium and graphite can be achieved.

关 键 词：废旧锂离子电池 负极 硫酸 铜箔 石墨 锂 

分 类 号：TM912[电气工程—电力电子与电力传动]