微乳液合成法制备锂离子电池正极材料Li_2FeSiO_4/C  

Preparation of Li_2FeSiO_4 Cathode Material for Lithium-Ion Batteries by a Microemulsion Method

作　　者：赵青[1] 邓坤发 庞秀芬[1] 杨蓉[1] 路蕾蕾[1] 

机构地区：[1]西安理工大学,陕西西安710048

出　　处：《稀有金属材料与工程》2015年第12期3065-3068,共4页Rare Metal Materials and Engineering

基　　金：教育部博士点基金(20116118120017);西安理工大学校创新项目(2014CX024)

摘　　要：利用微乳液法在温和条件下合成Li_2FeSiO_4/C的前驱体,煅烧后得到蠕虫形纳米Li_2FeSiO_4/C正极材料。用X射线衍射（XRD）、扫描电子显微镜（SEM）对材料的结构和形貌进行表征。通过恒流充放电对材料的电化学性能进行测试。结果表明,采用此法合成的前驱体在700℃煅烧9 h得到的蠕虫形Li_2FeSiO_4/C在室温、1.5~4.8 V的电压范围内,于C/16、C/8和1C倍率下的首次放电容量分别为140.1,139和94.0 mAh/g,循环20次后的容量保有率分别为96.4%,81.2%和73.5%。该样品具有良好的循环稳定性与倍率性能。The worm-shaped nano-Li2FeSiO4/C was obtained from calcination of the precursor synthesized by a microemulsion method under mild conditions. The obtained sample was characterized by X-ray diffraction （XRD） and field emission scanning electron microscope （FESEM）. The electrochemical experiments reveal that the worm-shaped nano-Li2FeSiO4/C composite sintered at 700 ℃ for 9 h has good cycle stability and rate capability with an initial discharge capacity of 140.1, 139, and 94 mAh/g at C/16, C/8 and 1C rate, respectively and the capacity retention ratios is 96.4%, 81.2% and 73.5% at the twentieth cycle, respectively.

关 键 词：锂离子电池 正极材料 LI2FESIO4 微乳液法 

分 类 号：TM912[电气工程—电力电子与电力传动]