Synthesis of LiFePO sub(4) by Co-Precipitation and Optimization of its Performance

As a positive electrode material for lithium-ion batteries, LiFePO sub(4) should be composited with carbonaceous materials due to its poor electrical conductivity. In this study, LiFePO sub(4)/C (carbon) composite was synthesized with method of solution co-precipitation, in which glucose was used as...

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Bibliographic Details
Published in:Key engineering materials 2012-07, Vol.519, p.132-136
Main Authors: Lv, Ying, Wang, Li Xia, Lu, Dong, Sun, Jing, Sun, Jun Cai
Format: Article
Language:English
Subjects:
Carbon
Carbonaceous materials
Coprecipitation
Diffraction
Electric potential
Electrochemical analysis
Electrode materials
Resistivity
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Summary:As a positive electrode material for lithium-ion batteries, LiFePO sub(4) should be composited with carbonaceous materials due to its poor electrical conductivity. In this study, LiFePO sub(4)/C (carbon) composite was synthesized with method of solution co-precipitation, in which glucose was used as a carbon source. The LiFePO sub(4) material was systematically optimized by X-ray diffraction, scanning electron microscopy. The crystalline structures, morphology and electrochemical performance of LiFePO sub(4) prepared by solution co-precipitation were compared with that obtained by solid-state reaction. It is found that LiFePO sub(4) is a pure phase with olivine structure, and exhibits a 3.4V discharge voltage plateau. In our experimental conditions, LiFePO sub(4)/C including 10wt. % of residual carbon obtained by solution co-precipitation possess excellent electrochemical performance, whose first specific capacity was 131.4 mAh[bullet]g super(-1) at 0.1C rate, the specific capacity was 128.3 mAh[bullet]g super(-1) after 20 times cycling.
ISSN:1013-9826
DOI:10.4028/www.scientific.net/KEM.519.132