LiCoO_2在SO_3气氛中焙烧过程的反应机理  

Chemical Reaction Mechanism of LiCoO_2 Roasting in SO_3 Atmosphere

作　　者：王大辉[1] 梁鸿雁[1] 陈怀敬[1,2] 杨玉娇[1] 孙建勇[1] 王宏伟[1] 

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,兰州730050 [2]兰州理工大学理学院,兰州730050

出　　处：《有色金属（冶炼部分）》2017年第4期1-5,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51264027);国家重点基础研究发展计划(973计划)项目(2012CB722806)

摘　　要：提出一种新的从废锂离子电池中获得LiCoO_2原材料并将其置于含有SO_3气氛的密闭坩埚中进行化学反应。采用模式配合法找出了反应过程的控速环节,用XRD分析了反应产物的物相组成并详细讨论了LiCoO_2在SO_3气氛中焙烧过程的反应机理。结果表明,反应温度是影响LiCoO2转化率的重要因素。LiCoO_2-SO_3反应的控制环节是内扩散型,表观活化能为51.04kJ/mol。产物物相有Li2SO4、Co_3O_4、Li_2Co(SO_4)_2,产物中未发现CoSO_4。反应过程中锂的转变过程为Li_2O→Li_2SO_4→Li_2Co(SO_4)_2,钴的转变过程为CoO_2→Co_3O_4→Li_2Co(SO_4)_2,且Co_3O_4向钴的硫酸盐的转变过程是整个化学反应的限制步骤。A new technique SO3 in closed container. was applied to recycle LiCoO2 from spent Li-ion batteries. LiCoO2 reacted with Controlled speed link of SO3-LiCoO2 reaction was found with Model Fitting Method. Phase transformation of product was analyzed by XRD and chemical reaction mechanism of LiCoO2 roasting in 803 atmosphere was discussed. The results show that temperature is the key factor. SO3-LiCoO2 reaction was controlled by inner diffusion with apparent activation energy of 51.04 kJ/mol. The products include Li2SO4 , C0304, and Li2C0（SO4）2, without COSO4. Transformation process of Li is CoO2→Co3O4→Li2Co（SO4）2, and that of Co is CoO2→Co3O4→Li2Co（SO4）2. The transformation process of Co3O4→Li2Co（SO4）2 is the limited step in whole reaction.

关 键 词：废锂离子电池 LICOO2 SO3气氛 气固反应 反应机理 

分 类 号：TB34[一般工业技术—材料科学与工程]