Ti离子掺杂对LiFePO_4材料性能的影响  

Influence of Ti Ion Doping on the Performance of LiFePO_4

作　　者：胡成林[1] 代建清[1] 戴永年[1] 易惠华[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,真空冶金国家工程实验室,昆明650093

出　　处：《材料导报》2007年第7期147-149,共3页Materials Reports

基　　金：云南省自然科学基金(2004E0009Q)

摘　　要：采用固相法合成了锂离子电池正极材料LiFePO4。为了提高LiFePO4的电化学性能,用Ti4+对LiFe-PO4进行掺杂。通过X射线衍射分析及电化学测试,研究了Ti掺杂对材料的结构和电化学性能的影响。以Li3PO4为锂源,(C4H9O)4Ti为掺杂源,合成了单一相Li1-xTixFePO4(x=0.005、0.01、0.02和0.03)。实验研究表明,掺入少量的Ti4+,可以减小晶胞体积,有效地提高了LiFePO4的循环性能和比容量。当(C4H9O)4Ti的掺入量为1mol%时,在50mA/g的充放电电流下,首次放电比容量为123mAh/g;经过60次循环后,容量基本上无衰减。In order to improve the electrochemical performance of LiFePO4, Li1-x, Tix FePO4 （x=0. 005,0. 01, 0. 02 and 0. 03）with Ti^4＋ dopant is prepared by solid state reaction using Li3 PO4 as Lithium precursor and （C4 H90）4Ti as dopant source. Influence of Ti^4＋ dopant on structure and electrochemical performance of Li1-x TixFePO4 material are investigated by X-ray diffraction and charge-discharge tests. The results show that low concentration Ti^4＋ dopant can decrease the lattice volume and increase the capacity and cycle performances of LiFePO4. When the dopant concentration of （C4 H9 O）4 Ti is lmol%, the first discharge capacity of Li9. 99 Ti0. 01 Fe PO4 is 123 mAh/g at 50mA/g charge-discharge rates. After 60 cycles, the capacity fade is neglectable.

关 键 词：锂离子电池 LIFEPO4 Ti掺杂 

分 类 号：TM912[电气工程—电力电子与电力传动]