球形Li1.5Mn0.75Ni0.15Co0.10O2的制备工艺及性能研究  

Study on Preparation Technology and Properties of Spherical Li_(1.5)Mn_(0.75)Ni_(0.15)Co_(0.10)O_2

作　　者：袁好[1] 陈乾坤[1] 杨秀康[1] 王先友[1] 

机构地区：[1]湘潭大学化学学院,电化学能源储存与转换湖南省重点实验室,湖南湘潭411105

出　　处：《湘潭大学自然科学学报》2017年第1期44-51,共8页Natural Science Journal of Xiangtan University

基　　金：湖南省重大科技成果转化项目(2012CK1006);湖南省教育厅科技成果产业化项目(1SCY004)

摘　　要：为了获取前躯体Mn_(0.75)Ni_(0.15)Co_(0.10)CO_3的最佳制备工艺,对共沉淀反应的pH值与氨含量最佳值进行了实验研究.实验表明:pH值为7.6,氨含量[NH_3]/[M]为0.12是材料最佳的前躯体制备工艺,所得到的前躯体球形度好,颗粒表面光滑,粒径分布均匀.为了制备电化学性能优异的正极材料,对前躯体最佳煅烧温度与配锂量进行研究.实验表明:当煅烧温度为850℃,锂含量[Li]/[M]为1.5时,所得到的富锂正极材料Li_(1.5)Mn_(0.75)Ni_(0.15)Co_(0.10)O_2球形形貌完整,具有良好的层状晶体结构.在2.0~4.8V、0.1C充放电条件下,首次放电容量为269.6mAh/g,在5C倍率下其放电比容量仍高达154.4mAh/g,显示出优异的倍率性能.In order to obtain the best preparation process of the precursor Mn0.75Ni0.15Co0.10CO3,pH value of coprecipitation reaction and ammonia content value are explored.Experimental results show that preparation process of precursor achieves optimal status with good sphericity,smooth particle surface as well as uniform particle size distribution under the condition of pH value of 7.6and ammonia content ratio of 0.12.In order to obtain the best electrochemical performance of the cathode materials,studies are proceeded on how to choose the optimal value of precursor calcination temperature and lithium content amount.Experimental results show that under the condition of calcination temperature of 850℃and lithium content ratio of1.5,the Li-rich cathode material Li1.5Mn0.75Ni0.15Co0.10O2 abtains integrated spherical shape and good layered crystal structure with initial discharge capacity of 269.6mAh/g under the conditions of charging and discharging voltage 2.0～4.8 V with 0.1Cdischarging ratio,as well as the discharge capacity of 154.4mAh/g at 5Cratio,which shows excellent rate performance.

关 键 词：PH值 氨含量 煅烧温度 配锂量 富锂正极 

分 类 号：TQ152[化学工程—电化学工业]