摘要
将MFC的阴极还原能力应用于废旧锂电池正极材料LiCoO_2的还原浸取.构建了以弱酸中LiCoO_2作为化学阴极电子受体的双室MFC,探讨了MFC阴极浸取还原LiCoO_2的可行性,并研究了浸取还原过程中阴极液pH、离子强度、固液比等因素对MFC的产电性能与LiCoO_2浸取效果的影响.实验结果表明:MFC阴极还原LiCoO_2使得固相中Co(III)被还原为液相中Co(II)是可行的,MFC能够持续地输出电压,且MFC优于弱酸浸取效果.阴极液pH值越低,MFC的产电性能和LiCoO_2的浸取效果越明显,阴极液pH为1.0时,MFC的最大输出电压为600 m V,60 h时浸取率达到86.5%;随着阴极液中KCl浓度和固液比(S/L)的增加,MFC输出电压和浸取效率也越高;对影响MFC的影响因素分析讨论得出,阴极液pH值是LiCoO_2还原过程中重要影响因素,因此,在后续的实验设计中要重点考虑pH的影响.
In this study,the cathodes of self-designed microbial fuel cells（ MFCs） were applied in a leaching process to recover cobalt from spent lithiumion batteries. The results showed that aqueous Co（ II） can be obtained from particles LiCoO2 on the cathodes and the outpower can be achieved continuously. The leaching effect on LiCoO2 by MFCs is superior to sole acid leaching. Lower pH of catholyte has greater influence on energy efficiency and higher recovery of aqueous Co（ II） from LiCoO2. When the pH is 1.0,the maximum output voltage of MFC is 600 m V,and leaching efficiency is up to86.5%. Higher KCl concentration and solid/liquid ratio（ S/L） can contribute to improving the maximum output voltage and Co（ II） concentrations of solution. This study concluded that pH is one of the most important factor for the reduction of LiCoO2,and attention should be paid on the impact of pH in the experiment.
出处
《环境科学学报》
CAS
CSCD
北大核心
2017年第4期1419-1426,共8页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.41372246
20140101)~~
关键词
微生物燃料电池
浸取
废旧锂电池
microbial fuel cell
leaching
spent lithium battery
