烧结温度对共沉淀法合成LiNi_(0.8)Co_(0.2)O_2电化学性能的影响  

Effects of sintering temperature on electrochemical properties of LiNi_(0.8)Co_(0.2)O_2 synthesized by co-precipitation method

作　　者：陈凯[1] 刘兴泉[1] 马慎思[1] 寇丹[1] 张峥[1] 

机构地区：[1]电子科技大学微电子与固体电子学院电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《电子元件与材料》2012年第10期54-59,共6页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.21071026);电子科技大学杰出人才引进项目资助(No.08JC-00303)

摘　　要：采用并流共沉淀法制备了前驱体Ni0.8Co0.2(OH)2,然后采用高温固相反应法制备了锂离子电池正极材料LiNi0.8Co0.2O2,通过热重分析(TG)、X射线衍射(XRD)、扫描电子显微镜(SEM)与恒流充放电测试等研究了烧结温度对所制备材料物相结构、微观形貌和电化学性能的影响。结果表明,在卧式管式炉中空气气氛下进行两段控温烧结:第一段烧结温度为700℃,第二段烧结温度为750℃时,合成的LiNi0.8Co0.2O2具有良好的六方晶系α-NaFeO2层状结构;在0.5C充放电倍率下和2.7-4.3 V电压范围内,其首次放电比容量为153.0 mAh/g,20次循环后的容量保持率高达98.5%。The precursor Ni0.8Co0.2（OH）2 was prepared by the concurrent co-precipitation method, then cathode material LiNi0.8Co0.2O2 for Li-ion batteries was synthesized by high temperature solid state reaction method. Effects of sintering temperature on the structures, surface morphology and electrochemical properties of the prepared material were investigated through TG analysis, XRD, SEM and constant current charge/discharge test, etc. The results demonstrate that the LiNi0.8Co0.202 sintered firstly at 700 ℃, secondly at 750℃ in air atmosphere in tubular furnace possesses a good hexagonal α-NaFeO2 layer structure, at the 0.5C rate and in the 2.7-4.3 V, its initial discharge specific capacity is 153.0 mAh/g, and the capacity retention reaches 98.5% after 20 cycles.

关 键 词：锂离子电池正极材料 LINI0.8CO0.2O2 共沉淀法 烧结温度 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]