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One-pot, glycine-assisted combustion synthesis and characterization of nanoporous LiFePO4/C composite cathodes for lithium-ion batteries
被引:37
作者:
Kalaiselvi, N.
[2
]
Manthiram, A.
[1
]
机构:
[1] Univ Texas Austin, Electrochem Energy Lab, Austin, TX 78712 USA
[2] Cent Electrochem Res Inst, ECPS Div, Karaikkudi 630006, Tamil Nadu, India
关键词:
Lithium-ion battery;
Lithium iron phosphate;
Combustion synthesis;
Nanoporous composite;
SOL-GEL SYNTHESIS;
ELECTROCHEMICAL PERFORMANCE;
OLIVINE LIFEPO4;
HYDROTHERMAL SYNTHESIS;
CARBON STRUCTURE;
IMPACT;
ENERGY;
FE;
D O I:
10.1016/j.jpowsour.2009.11.054
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:
Nanoporous LiFePO4/C composite cathodes have been synthesized by a novel one-pot, glycine-assisted combustion (GAC) method in presence of 2 wt.% Super P carbon in both At and 90% Ar-10% H-2 atmospheres at 750 degrees C for a short time of 6 h. While the At atmosphere offers phase pure samples, the Ar-H-2 atmosphere leads to the formation of impurity phases as indicated by X-ray diffraction data. The combustion-initiated expulsion of gases aids the formation of a nanoporous LiFePO4/C composite structure as evident from electron microscopic analysis, which could allow easy penetration of the electrolyte and realization of an electronic-ionic 3D network. The nanoporous LiFePO4/C sample synthesized in At atmosphere exhibits a high discharge capacity of 160 mAh g(-1) with 3% capacity fade in 50 cycles and high rate capability. With a short reaction time, the GAC method offers an energy efficient approach to synthesize high performance olivine LiFePO4/C composite cathodes. (C) 2009 Elsevier B.V. All rights reserved.
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页码:2894 / 2899
页数:6
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