LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4 cathodes with improved lithium storage properties

被引：53

作者：

Jang, I. C. ^{[1
]}

Son, C. G. ^{[1
]}

Yang, S. M. G. ^{[1
]}

Lee, J. W. ^{[1
]}

Cho, A. R. ^{[1
]}

Aravindan, V. ^{[1
,2
]}

Park, G. J. ^{[3
]}

Kang, K. S. ^{[4
]}

Kim, W. S. ^{[5
]}

Cho, W. I. ^{[6
]}

Lee, Y. S. ^{[1
]}

机构：

[1] Chonnam Natl Univ, Fac Appl Chem Engn, Kwangju 500757, South Korea

[2] Nanyang Technol Univ, Energy Res Inst, Singapore 637553, Singapore

[3] Saga Univ, Dept Appl Chem, Saga 8408502, Japan

[4] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea

[5] Daejung EM Co Ltd, Inchon 405820, South Korea

[6] Korea Inst Sci & Technol, Energy & Environm Div, Seoul 136791, South Korea

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2011年 / 21卷 / 18期

关键词：

LI-ION BATTERIES; ELECTROCHEMICAL PERFORMANCE; LICOPO4; CONDUCTIVITY; PHOSPHATES; CARBON; LICOO2; FE;

D O I：

10.1039/c1jm10574d

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：

LiCoPO4 and Li-1.02(Co0.9Fe0.1)(0.98)PO4 were prepared by conventional solid state reactions. The surface modification of Li-1.02(Co0.9Fe0.1)(0.98)PO4 particulates by LiFePO4 was successfully carried out by a dry coating procedure. TEM analysis confirmed the presence of a LiFePO4 coating layer of about 20 nm on the surface of the Li-1.02(Co0.9Fe0.1)(0.98)PO4 particles. All three cells delivered high initial discharge capacities of 122, 130 and 128 mA h g(-1) for LiCoPO4, Li-1.02(Co0.9Fe0.1)(0.98)PO4, and LiFePO4 modified Li-1.02(Co0.9Fe0.1)(0.98)PO4, respectively. However, these cells presented quite different cycle retention rates after 20 cycles, 21, 22 and 70% for LiCoPO4, Li-1.02(Co0.9Fe0.1)(0.98)PO4, and LiFePO4 modified Li-1.02(Co0.9Fe0.1)(0.98)PO4, respectively. The improved cycle retention of the LiFePO4-modified Li-1.02(Co0.9Fe0.1)(0.98)PO4 resulted from its reduced reactivity towards the electrolyte and the effective prevention of resistive layer formation on the LiCoPO4 surface during high voltage cycling.

引用

页码：6510 / 6514

页数：5

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