Effects of fluorine-substitution on the electrochemical behavior of LiFePO4/C cathode materials

被引：111

作者：

Liao, Xiao-Zhen ^{[1
]}

He, Yu-Shi ^{[1
]}

Ma, Zi-Feng ^{[1
]}

Zhang, Xiao-Ming ^{[1
]}

Wang, Liang ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2007年 / 174卷 / 02期

基金：

中国国家自然科学基金;

关键词：

fluorine substitution; lithium ion phosphate; cathode materials;

D O I：

10.1016/j.jpowsour.2007.06.146

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：

The effects of fluorine substitution on the electrochemical properties of LiFePO4/C cathode materials were studied. Samples with stoichiometric proportion of LiFe(PO4)(1-x)F-3x/C (x=0.025,0.05, 0.1) were prepared by adding LiF in the starting materials of LiFePO4/C. XRD and XPS analyses indicate that LiF was completely introduced into bulk LiFePO4 structure in LiFe(PO4)(1-x)F-3x/C (x= 0.025, 0.05) samples, while there was still some excess of LiF in LiFe(PO4)(0.9)F-0.3/C sample. The results of electrochemical measurement show that F-substitution can improve the rate capability of these cathode materials. The LiFe(PO4)(0.9)F-0.3/C sample showed the best high rate performance. Its discharge capacity at 10 C rate was 110 mAh g(-1) with a discharge voltage plateau of 3.31-3.0 V versus Li/Li+. The LiFe(PO4)(0.9)F-0.3/C sample also showed obviously better cycling life at high temperature than the other samples. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：720 / 725

页数：6

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