Preparation and Electrochemical Performance of Nano-Co3O4 Anode Materials from Spent Li-Ion Batteries for Lithium-Ion Batteries
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第3期
论文作者：Chuanyue Hu Jun Guo Jin Wen Yangxi Peng
文章页码：215 - 220
摘 要：<正>A hydrometallurgical process for the recovery of cobalt oxalate from spent lithium-ion batteries was used to recycle cobalt compound by using alkali leaching,reductive acid leaching and chemical deposition of cobalt oxalate.The recycled cobalt oxalate was used to synthesize nano-Co3O4 anode material by sol-gel method. The samples were characterized by thermal gravity analysis and differential thermal analysis（TGA/DTA）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） and charge/discharge measurements.The influence of molar ratio of Co2+ to citric acid and calcination temperature on the structure and electrochemical performance of nano-Co3O4 was evaluated.As the molar ratio of Co2+ to citric acid is 1:1,the face-centered cubic（fcc） Co3O4 powder shows the discharge capacity of 760.9 mA h g-1,the high coulombic efficiency of 99.7%in the first cycle at the current density of 125 mA g-1,and the excellent cycling performance with the reversible capacity of 442.3 mA h g-1after 20 cycles at the current density of 250 mA g-1.
Chuanyue Hu，Jun Guo，Jin Wen，Yangxi Peng
Department of Chemistry and Materials Science,Hunan Institute of Humanities,Science and Technology
摘 要：<正>A hydrometallurgical process for the recovery of cobalt oxalate from spent lithium-ion batteries was used to recycle cobalt compound by using alkali leaching,reductive acid leaching and chemical deposition of cobalt oxalate.The recycled cobalt oxalate was used to synthesize nano-Co3O4 anode material by sol-gel method. The samples were characterized by thermal gravity analysis and differential thermal analysis（TGA/DTA）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） and charge/discharge measurements.The influence of molar ratio of Co2+ to citric acid and calcination temperature on the structure and electrochemical performance of nano-Co3O4 was evaluated.As the molar ratio of Co2+ to citric acid is 1:1,the face-centered cubic（fcc） Co3O4 powder shows the discharge capacity of 760.9 mA h g-1,the high coulombic efficiency of 99.7%in the first cycle at the current density of 125 mA g-1,and the excellent cycling performance with the reversible capacity of 442.3 mA h g-1after 20 cycles at the current density of 250 mA g-1.
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