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Structure and electrochemical performance of LiFePO4 modified with mononuclear and binuclear phthalocyanines as cathode materials

Published online by Cambridge University Press:  09 February 2017

Feifei Xu ,
Ruiqiong Wang ,
Ronglan Zhang  and
Jianshe Zhao
Feifei Xu
Affiliation:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, Shaanxi 710069, People’s Republic of China
Ruiqiong Wang
Affiliation:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, Shaanxi 710069, People’s Republic of China
Ronglan Zhang*
Affiliation:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, Shaanxi 710069, People’s Republic of China
Jianshe Zhao*
Affiliation:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, Shaanxi 710069, People’s Republic of China
*
a) Address all correspondence to these authors. e-mail: zhangrl@nwu.edu.cn
b) e-mail: jszhao@nwu.edu.cn
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Abstract

Two series of lithium iron phosphate (LiFePO4) nanocomposites are prepared by a solvothermal method coupled with high temperature calcination using mononuclear and binuclear metal hexaaminophthalocyanines as modulatory additives, respectively. Physical and electrochemical performances of the composites as cathode materials of lithium-ion batteries are characterized by inductively coupled plasma (ICP), X-ray diffraction (XRD), infrared (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical techniques. The results indicate that the as-synthesized samples modified with binuclear metal phthalocyanines can improve electrochemical properties of LiFePO4 (LFP) for lithium-ion batteries. The composite using binuclear manganese hexaaminophthalocyanine as additive can achieve the highest initial specific discharge capacity of 152.3 mAh/g at 0.1 C, higher than that of ones modified with the corresponding mononuclear phthalocyanine 143.0 mAh/g. Furthermore, the most excellent product exhibits a pretty good capacity retention of 93.0% after 50 cycles at 0.1 C, cycling stability, and low charge transfer resistance of 58.7 Ω.

Keywords

LiFePO4metal phthalocyaninescathode materiallithium-ion batteries
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 6 , 28 March 2017 , pp. 1168 - 1176
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Chongmin Wang

References

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