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Hierarchical LiMn0.5Fe0.5PO4/C nanorods with excellent electrochemical performance synthesized by rheological phase method as cathode for lithium ion battery

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Abstract

The hierarchical LiMn0.5Fe0.5PO4/C (LMFP) nanorods were first successfully synthesized by rheological phase method using polyethylene glycol 4000 (PEG 4000) as a template reagent. The physical and electrochemical properties of the LiMn0.5Fe0.5PO4/C were characterized by TG-DTG, XRD, FTIR, SEM, TEM, EIS and galvanostatic charge-discharge measurements. The results reveal that the PEG-LMFP/C synthesized with the assistance of PEG 4000 shows unique bundle-type shape assembled of nanorods, while the LMFP/C synthesized without PEG 4000 presents a platelet-like shape with some agglomeration. Besides, a uniformly carbon layer coating on the surface of the PEG-LMFP/C can be seen from TEM images. The PEG-LMFP/C exhibits high specific capacity and superior rate performance with discharge capacities of 162, 133, 108, 95, and 78 mAh · g−1 at 0.1, 1, 5, 10, and 20 C rates, respectively. It is demonstrated that the synthesis of LMFP/C with PEG 4000 can significantly decrease the characteristic sizes of the crystals, resulting in improved electrochemical performance.

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Acknowledgments

The authors appreciate the supports of the project funded by the China Postdoctoral Science Foundation (No. 2014M562322) and the AutoCRC Project 1-111 “Development of Advanced Electrode and Electrolytes for LIB.”

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Authors and Affiliations

  1. College of Chemical Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China

    Huihui Shen, Wei Xiang, Xiaxing Shi & Benhe Zhong

  2. College of Material Science and Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China

    Heng Liu

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  1. Huihui Shen
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  2. Wei Xiang
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  3. Xiaxing Shi
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  4. Benhe Zhong
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  5. Heng Liu
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Correspondence to Heng Liu.

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Shen, H., Xiang, W., Shi, X. et al. Hierarchical LiMn0.5Fe0.5PO4/C nanorods with excellent electrochemical performance synthesized by rheological phase method as cathode for lithium ion battery. Ionics 22, 193–200 (2016). https://doi.org/10.1007/s11581-015-1539-3

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  • DOI: https://doi.org/10.1007/s11581-015-1539-3

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