锂离子电池正极材料Li_(1.26)Mn_(0.52)Fe_(0.11)Co_(0.11)O_2的制备与电性能研究  

Synthesis and electrochemical performance of Li_(1.26)Mn_(0.52)Fe_(0.11)Co_(0.11)O_2 anode material for Li-ion battery

作　　者：王英卓[1,2] 赵鹏翔[2] 陈九华 李建刚[2] 何向明[3] 

机构地区：[1]北京化工大学化工学院,北京100029 [2]北京石油化工学院应用化学系,北京102617 [3]清华大学核能与新能源技术研究院,北京100084

出　　处：《化工新型材料》2016年第4期85-87,93,共4页New Chemical Materials

基　　金：北京市自然科学基金(2122016)

摘　　要：采用＂溶胶-喷雾干燥-煅烧＂新技术合成了正极材料Li1.26Mn0.52Fe0.11Co0.11O2,采用XRD、SEM、循环伏安（CV）、电化学阻抗谱（EIS）及充放电测试研究了所制材料结构和电性能。结果表明：在650-800℃范围内煅烧都可制备得到纯α-NaFeO2相产物材料。其中,750℃所制备的样品具有高晶化度、低阳离子混乱度、高容量与良好循环稳定性。该样品经活化后容量可达232.9mAh/g,循环20周后容量保持率达到92.8%,兼顾了高容量与高循环稳定性。其容量衰减和电压平台下降可能与该材料高电压充电所导致的电解液分解以及充放电循环过程中的结构转变有关。Li_（1.26）Mn_（0.52）Fe_（0.11）Co_（0.11）O_2 anode materials were prepared via a new technology including＂wet gel-spraydried gel-annealing＂three steps,and the structural and electrochemical properties of as-prepared materials were investigated by using XRD,SEM,cyclic voltammetry（CV）,electrochemical imprdence spectra（EIS）and charge-discharge test.The results indicated that Li1.26Mn0.52Fe_0.11Co0.11O2 with pureα-NaFeO_2 phase can be obtained by annealing at 650~800℃.The sample annealed at 750℃ presented high crystallization,low cation disorder,high capacity and better cycling stability.It deliverd an capacity of 232.9mAh·g^-1 and a capacity retention of 92.8%after 20 cycles,showing both high capacity and good cycling stability.Its capacity fading and voltage plateau dropping during cycling may be attributed to the electrolyte decomposition at high charge voltage and structural transformation.

关 键 词：锂离子电池 正极 Li2MnO3-LiFeO2 钴离子掺杂 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]