新柠檬酸溶胶凝胶法研究  

Study on a new sol-gel method using citrate as complex reagent

作　　者：韩景立[1] 刘庆国[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《电源技术》2001年第3期211-213,共3页Chinese Journal of Power Sources

摘　　要：报道了以碱式碳酸镍、碱式碳酸钴和碳酸锂为原料 ,柠檬酸为络合剂的新溶胶凝胶法制备复合锂镍钴氧化物锂离子蓄电池正极材料。认为柠檬酸镍分解出的NiO中 ,其Ni孔穴和Ni3 +有碍于层状结构的形成。形成LiNi0 .8Co0 .2 O2 意味着Co代替部分Ni可抑制Ni孔穴的形成并有利于形成层状结构。部分Ni被Co代替减缓了容量的衰减。我们认为 ,Co替代能够抑制Ni孔穴的形成 ,从而原孔穴处的层状结构得到发育 ,抑制了容量的衰减。氧气流中制备的LiNi0 .8Co0 .2 O2 具有高的循环容量 ,约 190mAh·g-1。A new sol-gel method using alkaline nickel carbonate, alkaline cobalt carbonate and lithium carbonate as raw materials and citrate as complex reagent was introduced for preparing composite lithium-nickel-cobalt oxide as positive materials for lithium ion battery. The Ni vacancy and the Ni 3+ in NiO, which is decomposed from nickel citrate, are clarified to be inhibiting for the layer structure from forming. The formation of LiNi 0.8 - Co 0.2 O 2 means that partial Ni can be replaced by Co. Thus, the formation of Ni vacancy can be inhibited and it is good for the formation of layer structure. In addition, the replacement decreases the capacity attenuation. The LiNi 0.8 Co 0.2 O 2 prepared in oxygen flow performs high cyclic capacity, which is about 190 mAh·g -1 .

关 键 词：锂离子蓄电池 阴极 复合氧化物 柠檬酸溶胶凝胶法 

分 类 号：TM912.2[电气工程—电力电子与电力传动]