5V正极材料LiNi_(0.5)Mn_(1.5)O_(4-x)F_x(x=0,0.1)的流变相法制备与表征  

Rheological Method Preparation and Charcterization of LiNi_(0.5)Mn_(1.5)O_(4-x)F_x(x=0,0.1) as 5 V Cathode Materials

作　　者：熊利芝[1,2] 孔丽娜[1,3] 梁凯[1] 何则强[1,2] 

机构地区：[1]吉首大学生物资源与环境科学学院,湖南吉首416000 [2]中南大学化学化工学院,湖南长沙410083 [3]湘潭大学化学化工学院,湖南湘潭411105

出　　处：《精细化工》2010年第2期112-116,共5页Fine Chemicals

基　　金：中国博士后科学基金(2005037700);湖南省自然科学基金(07JJ3014);湖南省教育厅科学研究项目(07A058);中南大学博士后科学基金(2004107)~~

摘　　要：采用流变相法结合高温热处理制备LiNi0.5Mn1.5O4-xFx(x=0,0.1)。用X射线衍射、扫描电镜和电化学测试等手段对合成材料进行了表征。结果表明,F的掺入抑制了LiNi0.5Mn1.5O4颗粒长大,增强了Li+在固相中的扩散能力,改善了电极与电解质溶液之间的界面性质,有效地提高了LiNi0.5Mn1.5O4的循环性能和倍率性能。0.2C放电时LiNi0.5Mn1.5O3.9F0.1的首次放电容量达到147.8mA.h/g,经80次循环后平均每次循环的容量衰减仅为0.0068%。而0.5C和2.0C放电时首次放电容量达到0.2C放电时的94.2%和83.8%。LiNi0.5Mn1.5O4-xFx（x=0,0.1） were synthesized via the rheological method combining with high temperature treatment. The microstructure, surface morphology and electrochemical properties were characterized by various electrochemical methods in combination with X-ray diffraction （XRD） and scanning electron microscope （SEM）. Results show that the fluorine doping is favorable for supressing the growing up of LiNio.5 Mnl5 04 particles, enhacing the difuusion ability of Li^＋ in solid state and improving the interracial property between the electrode and electrolyte. Therefore, the cycling stability and the rate performance of LiNi0.5Mn1.5O4 was improved effectively. The first discharge capacity of LiNi0.5Mn1.5O3.9F0.1 is more than 147. 8 mA · h/g and the capacity fade is only 0. 006 8% after cycling 80 times at 0. 2 C 94. 2% and 83.8% of the first discharge capacity at 0. 2 C can be achieved at 0.5 C and 2.0 C.

关 键 词：LINI0.5MN1.5O4 氟掺杂 5V正极材料 流变相法 功能材料 

分 类 号：O646.21[理学—物理化学]