低温热处理法回收的钴酸锂应用于碱性二次电池的性能研究
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摘要
考虑到废旧LiCoO_2型锂电池回收过程繁琐、耗能高的问题,以及Ni/Co电池因成本高而无法实用化的现状,采用简易的低温热处理法对LiCoO_2废料进行回收,并将其作为Ni/Co碱性二次电池负极材料进行电化学性能测试.热处理可有效地提高LiCoO_2材料的电化学性能.当放电电流密度为100 m A/g时,回收LiCoO_2材料的最大放电容量为188 m Ah/g.
Considering that not only the drawback of complicated operation and energy consumption is existing in the recovery of LiCoO_2 from the waste Li-ion batteries but also high cost of negative materials has restricted the practicality of Ni/Co batteries, an optimized low-temperature heat treatment approach is given for recovery of discarded LiCoO_2 from waste Li-ion batteries. And the results of recovered LiCoO_2 served as anode for alkaline rechargeable batteries has demonstrated that heat treatment could remarkably improve the electrochemical properties of LiCoO_2 materials. The reaction mechanism of LiCoO_2 electrode is the reversible conversion between Co and Co(OH)2. At the discharge current density of 100 m A/g, the recovered LiCoO_2 displays the maxium discharge capacity of 188 m Ah/g.
Considering that not only the drawback of complicated operation and energy consumption is existing in the recovery of LiCoO_2 from the waste Li-ion batteries but also high cost of negative materials has restricted the practicality of Ni/Co batteries, an optimized low-temperature heat treatment approach is given for recovery of discarded LiCoO_2 from waste Li-ion batteries. And the results of recovered LiCoO_2 served as anode for alkaline rechargeable batteries has demonstrated that heat treatment could remarkably improve the electrochemical properties of LiCoO_2 materials. The reaction mechanism of LiCoO_2 electrode is the reversible conversion between Co and Co(OH)2. At the discharge current density of 100 m A/g, the recovered LiCoO_2 displays the maxium discharge capacity of 188 m Ah/g.
引文
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2童东革,赖琼钰,吉晓洋.废旧锂离子电池正极材料钴酸锂的回收[J].化工学报,2005,56(10):1 967-1 970.
3 Hu G,Deng X,Peng Z et al.Co/Mn-coated Li Ni O2cathode materials by solid-state reaction at room temperature[J].Rare Metal Mat Eng,2008,37(11):1 881-1 886.
4何汉兵,秦毅红.有机溶剂分离废旧锂离子电池[J].电源技术,2006,130(5):380-382.
5赵鹏飞,尹晓莹,满瑞林.废旧锂离子电池回收工艺研究进展[J].电池工业,2011,16(06):367-371.
6杨海波,梁辉,黄继承.从废旧锂离子电池中回收制备Li Co O2的结构与性能研究[J].稀有金属材料与工程,2006,35(05):836-840.
7 Gao X,Yao S,Yan T,et al.Alkaline rechargeable Ni/Co batteries:Cobalt hydroxides as negative electrode materials[J].Energy Environ Sci,2009,2(5):502-505.
8董桂霞,杜军,朱磊.Co O作为电极材料的可能性[J].电源技术,2006,130(9):713-715.
9 Song D,Xu Y,An C,et al.Recovered Li Co O2as anode materials for Ni/Co power batteries[J].Phys Chem Chem Phys,2012,14(1):71-75.
10 Zhao X,Ma L,Shen X.J.Co-based anode materials for alkaline rechargeable Ni/Co batteries:A review[J].Mater Chem,2012,22(2):277-285.
11 Wang Q,Jiao L,Du H,et al.Chainlike structures assembled by Co hierarchitectures:Synthesis and electrochemical properties as negative materials for alkaline secondary batteries[J].J Mater Chem,2011,21(37):14 159-11 462.
12 Li L,Xu Y,An C,et al.Enhanced electrochemical properties of Co/CMK-3 composite as negative material for alkaline secondary battery[J].J Power Sources,2013,238:117-122.
13 Xu Y,Song D,Li J,et al.Electrochemical properties of Li Co O2+x%S mixture as anode material for alkaline secondary battery[J].Electrochim Acta,2012,85:352-357.
14 Chung S,Wang K,Teng M,et al.Electrochemical hydrogenation of nanocrystalline face-centered cubic Co powder[J].Int J Hydrogen Energy,2009,34(3):1 383-1 388.
15 Zhao X,Ma L,Yao Y,et al.Electrochemical energy storage of Co powders in alkaline electrolyte[J].Electrochim Acta,2010,55(3):1 169-1 174.