Complete cobalt recovery from lithium cobalt oxide in self-driven microbial fuel cell - Microbial electrolysis cell systems

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• 作者：Liping Huang ; ^{lphuang2008@gmail.com" class="auth_mail} ; ^{lipinghuang@dlut.edu.cn" class="auth_mail} ; Binglin Yao ; Dan Wu ; Xie Quan¹ ; ^{quanxie@dlut.edu.cn" class="auth_mail}
• 关键词：Microbial fuel cell ; Microbial electrolysis cell ; Self-driven ; Cobalt leaching ; Co(II) reduction ; Lithium cobalt oxide
• 刊名：Journal of Power Sources
• 出版年：1 August, 2014
• 年：2014
• 卷：259
• 期：Complete
• 页码：54-64
• 全文大小：3471 K

文摘

Complete cobalt recovery from lithium cobalt oxide requires to firstly leach cobalt from particles LiCoO₂ and then recover cobalt from aqueous Co(II). A self-driven microbial fuel cell (MFC)-microbial electrolysis cell (MEC) system can completely carry out these two processes, in which Co(II) is firstly released from particles LiCoO₂ on the cathodes of MFCs and then reduced on the cathodes of MECs which are powered by the cobalt leaching MFCs. A cobalt leaching rate of 46聽卤聽2聽mg聽L^鈭?聽h^鈭? with yield of 1.5聽卤聽0.1聽g聽Co聽g^鈭? COD (MFCs) and a Co(II) reduction rate of 7聽卤聽0聽mg聽L^鈭?聽h^鈭? with yield of 0.8聽卤聽0.0聽g聽Co聽g^鈭? COD (MECs), as well as a overall system cobalt yield of 0.15聽卤聽0.01聽g聽Co聽g^鈭? Co can be achieved in this self-driven MFC-MEC system. Coulombic efficiencies reach 41聽卤聽1% (anodic MFCs), 75聽卤聽0% (anodic MECs), 100聽卤聽2% (cathodic MFCs), and 29聽卤聽1% (cathodic MECs) whereas overall system efficiency averages 34聽卤聽1%. These results provide a new process of linking MFCs to MECs for complete recovery of cobalt and recycle of spent lithium ion batteries with no external energy consumption.