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Influence of pH Value on the Properties of NH4Fe2(OH)- (PO4)2·2H2O Precursor and LiFePO4/C Composite

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Abstract

With the aim of investigating the influence of pH value on the properties of NH4Fe2(OH)(PO4)2·2H2O precursor and LiFePO4/C composite, we prepared a series of (NH4)Fe2(OH)(PO4)2·2H2O by adjusting the pH value in the chemical precipitation process. In addition, the LiFePO4/C composite was fabricated by using (NH4)Fe2(OH)(PO4)2·2H2O as precursor. The images of scanning electron microscopy demonstrate that the precursor particle size increases as the pH value increases, which facilitates the tuning of the properties of the LiFePO4/C composite. A further investigation indicates that an increase of viscosity of the precipitate slurry in the chemical precipitation process is responsible for the change of precursor particle size. In addition, the electrochemical performance of the LiFePO4/C composite is also governed by pH value. LiFePO4/C composite prepared at the pH value of 4.0 delivers a discharge capacity of 91 mAh g−1 and 114 mAh cm−3 at 10 C, showing a capacity retention of 99.48% after 100 cycles, which confirms the excellent rate capability and cycling stability.

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Acknowledgement

This work was financially supported by the Science and technology support program in Sichuan province (No. 14ZC2237).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, People’s Republic of China

    Xue-Bao Liu, Guo-Biao Liu, Chen Chen, Jian-Long Li & Heng Liu

  2. Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology, China Academy of Engineering Physics, Chengdu, 610207, China

    Guo-Biao Liu

  3. College of Computer Science and Technology, Southwest University for Nationalities, Chengdu, 610041, People’s Republic of China

    Yan Wang

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  1. Xue-Bao Liu
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  2. Guo-Biao Liu
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  3. Yan Wang
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  4. Chen Chen
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  5. Jian-Long Li
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  6. Heng Liu
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Correspondence to Heng Liu.

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Liu, XB., Liu, GB., Wang, Y. et al. Influence of pH Value on the Properties of NH4Fe2(OH)- (PO4)2·2H2O Precursor and LiFePO4/C Composite. J. Electron. Mater. 44, 1008–1014 (2015). https://doi.org/10.1007/s11664-014-3613-4

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  • DOI: https://doi.org/10.1007/s11664-014-3613-4

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