非化学计量比Li_(1+x)Ni_(0.8)Co_(0.2)O_2结构和性能研究  

Study on the Structure and Electrochemical Characterization of the Non-stoichiometric Li_(1+x)Ni_(0.8)Co_(0.2)O_2 Materials

作　　者：谷亦杰[1] 孔环[1] 黄小文[1] 崔洪芝[1] 吴惠康 杜洪彦 张洪涛 周恒辉[4] 魏清[4] 

机构地区：[1]山东科技大学材料学院,山东青岛266510 [2]青岛澳柯玛集团有限公司新能源材料研发中心,山东青岛266510 [3]Department of Materials,Queen Mary University of London [4]北京大学化学与分子工程学院,北京100871

出　　处：《矿冶工程》2007年第2期75-77,共3页Mining and Metallurgical Engineering

基　　金：青岛自然科学基金(04-2-JZ-102);科技部国际合作重点项目(2005DFA70480)

摘　　要：共沉淀法合成了层状Li1+xNi0.8Co0.2O2(x=0和0.05),采用XRD和电化学方法对其进行了研究。与LiNi0.8Co0.2O2相比,Li1.05Ni0.8Co0.2O2有较高的放电容量和较差的循环性能。与LiNi0.8Co0.2O2放电容量微分曲线相似,Li1.05Ni0.8Co0.2O2在4.15 V存在负峰,随着循环次数的增加,4.15 V负峰峰位明显向左移。与LiNi0.8Co0.2O2放电容量微分曲线不同,层状结构Li1.05Ni0.8Co0.2O2的4.15 V负峰峰高随循环次数的增加而增高,循环过程促进了Li1.05Ni0.8Co0.2O2结构转变。The structure and electrochemical performance of layered Li1＋xNi0.8Co0.2O2 with x = 0 and 0.05 was prepared by co-precipitation were investigated by XRD and electrochemical method respectively. In contrast with Li1＋xNi0.8Co0.2O2 possessed the better specific capacity and the worse cycling performance. There was a negative peak at 4.15 V in the discharge differential capacity plots of Li1＋xNi0.8Co0.2O2. The peak place moved towards the left side and the peak height increased with the electrochemical cycle times. The analysis indicates that the electrochemical cycle accelerates the structure transition for Li1＋xNi0.8Co0.2O2.

关 键 词：层状Li1+xNi0.8Co0.2O2 电化学循环诱发 结构转变 

分 类 号：O614.81[理学—无机化学] O614.111[理学—化学]