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Investigation on electrochemical performance at the low temperature of LFP/C-P composite based on phosphorus doping carbon network

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Abstract

LiFePO4 (LFP) has been recommended as a promising cathode material due to its excellent cycle performance and high safety. However, the poor performance of low temperatures restricts the development and application of LFP cathode. Herein, the electrochemical properties of the previously synthesized LFP/C-P composite with carbon coating and phosphorus doping are discussed in the low temperature. In the low-temperature environment of − 40 °C, the first discharge-specific capacity of the LFP/C-P composite cathode at 0.1 C can reach 82.7 mAh g−1, while discharge-specific capacity of pristine commercial LFP is only 72.2 mAh g−1. To further improve the electrochemical performance of LFP/C-P at low temperatures, different charging-discharging methods were compared. It is noted that prolonging the constant voltage charging time can further improve the electrochemical performance of the cell, which increases the discharge capacity of LFP/C-P to 85.8 mAh g−1. The LFP/C-P composite cathode therefore not only ameliorates the poor electrochemical performance of LFP but provides a new way to broaden its application range.

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Acknowledgments

This work is supported by the Major Science and Technology Projects in Gansu Province (17ZD2GC011), the High-Value Patent Conversion Implementation project (18ZC1LA014), the Transformation of Scientific and Technological Achievements of Gansu Institutions of Higher Education (No. 2017D-04), and the Lanzhou University of Technology Hongliu First-class Discipline Construction Program.

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Authors and Affiliations

  1. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China

    Xiaoling Cui, Kuanyou Tuo, Yingchun Xie, Chunlei Li, Dongni Zhao, Li Yang, Xiaolan Fu & Shiyou Li

  2. Gansu Engineering Laboratory of Cathode Material for Lithium-ion Battery, Lanzhou, 730050, China

    Xiaoling Cui, Kuanyou Tuo, Yingchun Xie, Chunlei Li, Dongni Zhao, Li Yang, Xiaolan Fu & Shiyou Li

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  1. Xiaoling Cui
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  2. Kuanyou Tuo
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Correspondence to Shiyou Li.

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Cui, X., Tuo, K., Xie, Y. et al. Investigation on electrochemical performance at the low temperature of LFP/C-P composite based on phosphorus doping carbon network. Ionics 26, 3795–3808 (2020). https://doi.org/10.1007/s11581-020-03567-9

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