• 关键词：微生物燃料电池  浸取  废旧锂电池

• 基金项目：国家自然科学基金（No.41372246，20140101）

• 程建萍
• 合肥工业大学, 机械与汽车工程学院, 合肥 230009

• 胡淑恒
• 合肥工业大学, 资源与环境工程学院, 合肥 230009

• 汪家权
• 合肥工业大学, 资源与环境工程学院, 合肥 230009

• 唐志国
• 合肥工业大学, 机械与汽车工程学院, 合肥 230009

• 金惠敏
• 合肥市第六中学, 合肥 23001

• 摘要：将MFC的阴极还原能力应用于废旧锂电池正极材料LiCoO₂的还原浸取.构建了以弱酸中LiCoO₂作为化学阴极电子受体的双室MFC，探讨了MFC阴极浸取还原LiCoO₂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LiCoO₂浸取效果的影响.实验结果表明：MFC阴极还原LiCoO₂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LiCoO₂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 mV，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LiCoO₂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.

• Abstract：In this study, the cathodes of self-designed microbial fuel cells (MFCs) were applied in a leaching process to recover cobalt from spent lithium-ion 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 mV, and leaching efficiency is up to 86.5%. 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.

• Key words：microbial fuel cell  leaching  spent lithium battery

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