锂电池正极材料LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2的制备与性能  

Synthesis and electrochemical performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 anode material for Li-ion batteries

作　　者：陈九华 李建刚[2] 王垒[2,3] 段碗璐 迟娜[2,4] 

机构地区：[1]北京化工大学理学院,北京100029 [2]北京石油化工学院应用化学系,北京102617 [3]内蒙古工业大学化工学院,呼和浩特010051 [4]中国石油大学化工学院,北京102249

出　　处：《化工新型材料》2014年第8期37-39,42,共4页New Chemical Materials

基　　金：北京市自然科学基金资助(2122016)

摘　　要：运用“溶胶-喷雾干燥-煅烧”新技术合成了正极材料LiNi0.8Co0.1Mn0.1O2，采用XRD、SEM、电化学阻抗谱（EIS）及充放电测试研究了煅烧温度对所制材料结构和电性能的影响。结果表明，在750～850℃都可制备得到纯相LiNi0.8Co0.1Mn0.1O2。其中，800℃所合成样品具有适宜的晶粒大小、最佳的晶化程度和阳离子有序度，最小的电荷传递阻抗，最大的锂离子扩散系数和最佳的电化学表现。该样品0．2C首次放电容量达到189．1mAh·g^-1，以5C循环的放电比容量仍可达到136mAh·g^-1，第30周0．2C放电容量达初始容量的97．5％，显示出高容量、良好的倍率与循环性能。LiNi0.8 Co0. 1Mn0.1 O2 anode materials were prepared via a new technology including “wet gel-spray-dried gel-annealing”three steps,and the effects of annealing temperatures on the structural and electrochemicalproperties of asprepared materials were investigated by using XRD, SEM, electrochemical imprdence spectra （EIS） and charge-discharge test. The results indicated that LiNi0.8 Co0. 1 Mn0.1 O2 with pure a-NaFeO2 phase can be obtained by annealing at 750～850℃.The sample annealed at 800℃ presented the best structural properties with suitable particle size, the best crystalliza- tion and cation-ordering,which leaded to the best electrochemical properties with the smallest charge transfer impedance, the biggest Li^＋ diffusion coefficient and the best electrochemical performance. It delivered an initial capacity of 189.1 mAh · g^-1 at 0.2C,136.4 mAh · g^-1 while cycled at 5C,and a capacity retention of 97.5% after 30 cycles,showing promised characteristics of high capacity,good rate capability and cycleablity.

关 键 词：锂离子电池 正极 LINI0 8Co0 1Mn0 1O2 溶胶-凝胶 喷雾干燥 

分 类 号：TQ150.6[化学工程—电化学工业] TQ131.11