Effect of Co2P on electrochemical performance of Li(Mn0.35Co0.2Fe0.45)PO4/C

被引：16

作者：

Kuo, H. T. ^{[1
]}

Chan, T. S. ^{[1
]}

Bagkar, N. C. ^{[1
]}

Liu, G. Q. ^{[1
]}

Liu, R. S. ^{[1
]}

Shen, C. H. ^{[2
]}

Shy, A. S. ^{[2
]}

Xing, X. K. ^{[2
]}

Chen, J. M. ^{[3
]}

机构：

[1] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan

[2] Synergy ScienTech Corp, Sci Tech based Ind Pk, Hsinchu 300, Taiwan

[3] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 27期

关键词：

D O I：

10.1021/jp710708r

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：

In this paper, we report the synthesis of carbon coated Li(Mn0.35Co0.2Fe0.45)PO4 and discuss the effect of CO2P formation during the carbothermal reduction process, which enhances the electrochemical performance of cathode material for lithium ion batteries. It was observed that Co2P was favorably formed in 5% H-2/Ar than in Ar atmosphere. The conductivity of Li(Mn0.35Co0.2Fe0.45)PO4/C sintered at 600-800 degrees C in 5% H-2/Ar is increased as the temperature is increased. The O K-edge X-ray absorption near edge spectrum (XANES) demonstrates that content of hole carriers is increased in Li(Mn0.35Co0.2Fe0.45)PO4/C as the amount of Co2P increased. We also observed that the capacity of Li(Mn0.35Co0.2Fe0.45)PO4/C is increased with sintering temperature, and it exhibited a maximum capacity of 166 mAh/g at 700 degrees C. It was found that the enhancement in the discharge capacity of sintered Li(Mn0.35Co0.2Fe0.45)PO4/C was as a result of its higher electrical conductivity under 5% H-2/Ar atmosphere as compared with Ar atmosphere.

引用

页码：8017 / 8023

页数：7

共 36 条

[1] The source of first-cycle capacity loss in LiFePO4 [J].