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Improving the electrochemical properties of lithium iron(II) phosphate through surface modification with manganese ion(II) and reduced graphene oxide

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Abstract

Lithium iron(II) phosphate (LiFePO4) particles were simultaneously modified via reduced graphene oxide (rGO) and manganese ion(II) (Mn2+) through a facile one-step method. X-ray photoelectron spectroscopy unravels that the formation of Mn-O bond originated from Mn2+ ion and fringe oxygen atoms of LiFePO4, which is beneficial for the rate capability of cathode. As cathode for lithium-ion battery, the as-prepared rGO/Mn-LiFePO4 composite exhibits excellent electrochemical properties. Its discharge-specific capacity is 159 mAh g−1 at 1 C after 800 cycles with capacity retention of 92%. Even at a high rate of 10 C, the rGO/Mn-LiFePO4 composite is still capable of delivering 140 mAh g−1 of discharge-specific capacity, indicating its excellent rate capability and cycle stability. It was demonstrated that the simultaneous modification of Mn2+ and rGO does not destroy the olivine structure of LiFePO4, but it can stabilize the crystal structure, decrease the electrode polarization, enhance the electronic conductivity and Li+ diffusion coefficient, and thus improve its cycling and high-rate capability.

The comparisons of rate capability and cycle performance of products. The insert illustrations show SEM and TEM images of the rGO/Mn-LiFePO4 composite

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Acknowledgements

This work was supported by 973 Special Preliminary Study Plan (Nos. 2014CB260411 and 2015CB931801), the National Science Foundation of China (No. 11374205), Scientific Research Fund of San-Qin Scholar (BJ11-26) and Scientific Research Fund of Shaanxi University of Science & Technology (XSG(4)006), National Natural Science Foundations of China (No. 21203116), and China Postdoctoral Science Foundation-funded project (No. 2014M562514XB).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, Shaanxi, People’s Republic of China

    Yushuang Gao, Lifeng Zhang & Shouwu Guo

  2. Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Shuo Feng, Wenzhuo Shen & Shouwu Guo

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  1. Yushuang Gao
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  2. Lifeng Zhang
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  3. Shuo Feng
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Correspondence to Wenzhuo Shen or Shouwu Guo.

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Gao, Y., Zhang, L., Feng, S. et al. Improving the electrochemical properties of lithium iron(II) phosphate through surface modification with manganese ion(II) and reduced graphene oxide. J Solid State Electrochem 22, 285–292 (2018). https://doi.org/10.1007/s10008-017-3757-2

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