无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (6): 92-103.doi: 10.19964/j.issn.1006-4990.2022-0704

• 环境·健康·安全 • 上一篇    下一篇

退役三元动力锂电池全元素循环再利用工艺研究

陆钧皓()   

  1. 上海电气集团股份有限公司中央研究院,上海 200070
  • 收稿日期:2022-12-01 出版日期:2023-06-10 发布日期:2023-06-14
  • 作者简介:陆钧皓(1990— ),硕士,中级工程师,主要从事固废资源化利用研发工作;E-mail:727279560@qq.com
  • 基金资助:
    国家自然科学基金(51908351)

Study on full element recycling process of retired ternary power lithium battery

LU Junhao()   

  1. Central Research Institute of Shanghai Electric Group Co.,Ltd.,Shanghai 200070,China
  • Received:2022-12-01 Published:2023-06-10 Online:2023-06-14

摘要:

对退役动力锂电池正极材料(LiNi0.5Co0.2Mn0.3O2)优先提锂后的滤渣进行Ni、Co、Mn元素提取,利用(C8H17O)2PO2H(P204)萃取剂在萃取pH为3、萃取相比V(O)∶V(A)=1∶1(有机相和水相体积比)、萃取时间为15 min、萃取级数为3级、盐洗相比V(O)∶V(A)=1∶2、反萃相比V(O)∶V(A)=1∶0.5、反萃时间为15 min、反萃级数3级的条件下萃取Mn,所得Mn回收率为98.6%,MnSO4纯度为99.5%(质量分数)。利用(C8H172PO3H(P507)萃取剂在萃取pH为4.5、萃取相比V(O)∶V(A)=1∶1、萃取时间为10 min、萃取级数为2级、盐洗相比V(O)∶V(A)=1∶2、反萃取相比V(O)∶V(A)=1∶0.5、反萃时间为10 min、反萃级数2级的条件下萃取Co,所得Co回收率为96.5%,CoSO4纯度为94.9%(质量分数)。利用(C8H172PO2H(C272)萃取剂对萃取Mn、Co后的萃余液进行深度除杂后回收Ni元素,所得Ni回收率为96.5%,NiSO4纯度为97.3%(质量分数)。利用回收得到的电池原材料重新合成电池正极材料,并测试其晶体结构、物理性能和电化学性能,结果表明,合成后的正极材料相关性能指标达到YS/T 798—2012《镍钴锰酸锂》行业标准,具备进入电池行业的条件。

关键词: 退役三元动力锂电池, 萃取, 盐洗, 正极材料

Abstract:

The process of extracting Ni,Co and Mn from the filter residue of preferential extraction of lithium from retired ternary power lithium battery was studied.Using extractant(C8H17O)2PO2H(P204) under the following processing conditions such as extraction pH of 3,extraction V(O)∶V(A)=1∶1,extraction time of 15min,extraction order of 3,salt washing V(O)∶V(A)=1∶2,back extraction V(O)∶V(A)=1∶0.5,back extraction time of 15min,back extraction order of 3,the recycling rate of Mn was 98.6%,while the purity of MnSO4 was 99.5%.Using extractant((C8H172PO3H(P507) under the following processing conditions such as extraction pH of 4.5,extraction V(O)∶V(A)=1∶1,extraction time of 10 min,extraction order of 2,salt washing V(O)∶V(A)=1∶2,back extraction V(O)∶V(A)=1∶0.5,back extraction time of 10 min,back extraction order of 2,the recycling rate of Co was 96.5%,while the purity of CoSO4 was 94.9%.After impurities in Mn,Co raffinate were removed with(C8H172PO2H(C272) extractant,the recovery rate of Ni was 96.5%,while the purity of NiSO4 was 97.3%.The battery cathode materials was regenerated by the extracted battery raw materials and their crystal structure,physical properties,electrochemical properties were tested.The results showed that the relevant performance indexes of the synthesized cathode materials met the YS/T 798—2021“Lithium nickel cobalt manganese oxide”industry standards and were qualified to enter the battery industry.

Key words: retired ternary power lithium battery, extraction, salt washing, cathode materials

中图分类号: