Physical and electrochemical properties of LiFePO4/carbon composite synthesized at various pyrolysis periods

被引:61
|
作者
Hsu, KF
Tsay, SY
Hwang, BJ
机构
[1] Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei 106, Taiwan
[2] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan
关键词
nano-composite; LiFePO4; cathode material; conductivity;
D O I
10.1016/j.jpowsour.2005.03.094
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Aluminum-doped lithium iron phosphate was synthesized with a modified sol-gel process. The sol-gel derived cathodes show much higher conductivity than those prepared by a solid-state method. The conductivity is 8 x 10(-2) S cm(-1) for the Al-doped LiFePO4/carbon composite powders synthesized at 850 degrees C for 2 h, as determined using AC impedance spectroscopy. The electrodes consisting of the Al-doped LiFePO4/carbon composite powders were fabricated for the electrochemical characterization and showed a specific capacity of about 150 mAh g(-1) at C/40 rate. Not only the conductivity A the crystal lattice but also the conductivity of the grain boundary is enhanced for the nano-sized Al-doped LiFePO4/carbon composite powders. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:529 / 533
页数:5
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