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

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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.

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ACKNOWLEDGMENTS

The authors thank the National Natural Science Foundation of China (Nos. 21401149 and 21371143), the National Basic Research Program (973 Program 2013CB934001), “Science and Technology plan project of Xi’an City [No. CXY1438(6)], Key Laboratory Research and Establish Program of Shaanxi Education Section (No. 11JS112), and Special Foundation of Shaanxi Education Section (No. 12JK0603) for the financial support of this work.

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Authors and Affiliations

  1. 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, Ronglan Zhang, Bei Xu, Fei Yang & Jianshe Zhao

  2. School of Material Science and Engineering, Beihang University, HaiDian District, Beijing, 100191, People’s Republic of China

    Shichao Zhang

  3. Composites Research Institute, Weinan Normal University, Weinan, 714000, People’s Republic of China

    Junlong Wang

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  1. Ruiqiong Wang
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  2. Ronglan Zhang
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  3. Bei Xu
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  4. Fei Yang
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  5. Jianshe Zhao
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  6. Shichao Zhang
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Correspondence to Ronglan Zhang or Jianshe Zhao.

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Wang, R., Zhang, R., Xu, B. et al. Highly improving the electrochemical performance of LiFePO4 modified by metal phthalocyanines as cathode materials. Journal of Materials Research 30, 645–653 (2015). https://doi.org/10.1557/jmr.2014.396

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