锂二次电池新型正极材料FeF_3(H_2O)_(0.33)的制备及电化学性能研究  

Studies on preparation and electrochemical performances of FeF_3(H_2O)_(0.33) cathode material for the application of lithium rechargeable battery

作　　者：伍文[1] 王先友[1] 王欣[1] 王国宝[1] 杨顺毅[1] 魏建良[1] 李娜[1] 

机构地区：[1]湘潭大学化学学院,湖南湘潭411105

出　　处：《功能材料》2008年第11期1824-1827,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20673092)

摘　　要：用水热法制备FeF3（H2O）4．5前驱体，在惰性气体保护下将前驱体制备成含微量水的FeF3（H2O）0.33，FeF3（H2O）0.33与乙炔黑球磨制备成锂二次电池新型纳米级的复合正极材料。通过傅里叶红外光谱（FT-IR）、X射线衍射（XRD）、扫描电镜（SEM）和电化学测试等研究了材料的结构和电化学性能。结果表明，所制备的FeF3是含微量水的FeF3（H2O）0.33，具有典型正交晶系结构，并且所制备的材料粒径均匀。FeF3（H2O）0.33／C复合材料在充放电倍率为0．1C和电压范围在2．0～4．5V内，具有较高的放电比容量和容量保持率。其首次放电比容量为190mAh／g，在循环30次后容量保持率为第2次的86％。The precursor of FeF3（H2O）4.5 was synthesized by hydrothermal method. Then the precursor was prepared in the inert gases to get the minim-water FeF3（H2O）4.5. The novel cathode material carbon-metal fluoride composites of lithium rechargeahle batteries were prepared through mechanical milling with acetylene black. The structural and electrochemical properties of the as-prepared samples were investigated by fourier transform infrared （FT-IR）, X-ray diffraction （XRD）, scanning electron microscope （SEM） and electrochemical experiments. The results showed that the prepared FeF3 was actually the minim-water FeF3（H2O）4.5 with typical orthorhombic structure, and the particle sizes of the samples were distributed uniformly. It＇s found that FeF3（H2O）4.5 composite showed an improved discharge capacity retention and a very high discharge specific capacity at 0.1C rate in the voltage range of 2. 0-4. 5V. The FeF3（H2O）4.5 composite electrode delivered an initial discharge capacity of 190mAh/g during the first cycle and the capacity retention at the 30th cycle was 86% relative to the second cycle.

关 键 词：锂二次电池 正极材料 FeF3(H2O)0.33/C复合材料 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]