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Highly improving the electrochemical performance of LiFePO4 modified by metal phthalocyanines as cathode materials

Published online by Cambridge University Press:  18 February 2015

Ruiqiong Wang ,
Ronglan Zhang ,
Bei Xu ,
Fei Yang ,
Jianshe Zhao ,
Shichao Zhang  and
Junlong Wang
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
Bei 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
Fei Yang
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
Shichao Zhang
Affiliation:
School of Material Science and Engineering, Beihang University, HaiDian District, Beijing 100191, People's Republic of China
Junlong Wang
Affiliation:
Composites Research Institute, Weinan Normal University, Weinan 714000, 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 novel series of cathode materials LiFe1−xMxPO4/C (x ≈ 0.0040; M = Mn, Fe, Co, Ni, Cu, and Zn) composites based on metal phthalocyanines (MPc) and metal tetrasulfophthalocyanines (MPcTs) to modify lithium iron phosphate (LiFePO4) for lithium-ion batteries (LIBs) are in situ prepared by solvothermal and calcination techniques. Structures and morphologies of all the composites are characterized by normal methods. To evaluate the electrochemical performance of the composites, the charge/discharge capabilities, rate performance, cycling stabilities, cyclic voltammetry profiles, and electrochemical impedance spectroscopy plots of the LIBs using them as cathode materials are measured carefully. The results indicate that most of the composites deliver highly improved initial discharge capacity and show remarkable reversibility and cycling stabilities. Especially, composites using MPcTs as additives are more efficient for the improvement of specific capacity, rate capability, reversibility, and cycling stability.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 5 , 14 March 2015 , pp. 645 - 653
Copyright
Copyright © Materials Research Society 2015 

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