Effect of Spherical Particle Size on the Electrochemical Properties of Lithium Iron Phosphate

  • Yuanyuan Liu (刘远远)
  • Hao Liu
  • Xinxin Zhao
  • Li Wang
  • Guangchuan Liang (梁广川)Email author
Advanced Materials


The effect of spherical particle size on the surface morphology, electrochemical property and processability of lithium iron phosphate was systematically studied. Spherical lithium iron phosphate with different particle size distributions controlled with ball time of precursor slurry was prepared by spray drying method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), charge and discharge measurements and EIS. The electrochemical performances of the sample materials were measured by coin cells and 14500 batteries. XRD shows that the spherical lithium iron phosphate with different particle sizes all have good crystal structure due to the perfect mixing of the raw materials and rapid drying. The lithium iron phosphate microsphere with different particle sizes self-assembled with submicron primary particles has a core-shell structure. The longer ball time the precursors are, the smaller the active material particles are prepared. The electrode material with 6 h ball time of precursor slurry has the best physical properties and the processability. The composite has a uniform particle size and higher tap density of 1.46 g/cm3, which delivers a discharge capacity of 167.6 mAh/g at a discharge rate of 0.5 C. The results were confirmed by the 14 500 mA·h cylindrical batteries, which delivers a discharge capacity of 579 mAh at 0.5 C. And low-temperature performance with capacity of 458.5 mA h at −20 °C under a discharge rate of 0.5 C is the 79.2% of the same discharge rate at 25 °C. Otherwise, the 14500 batteries also exhibit excellent cycling performance and the capacity maintains 93% after 2 000 cycles.

Key words

lithium ion battery micro-spherical structure particle size spray drying 


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  1. [1]
    Liu L, Lei X, Tang H, et al. Influences of La Doping on Magnetic and Electrochemical Properties of Li3V2(PO4)3/C Cathode Materials for Lithium-ion Batteries[J]. Electrochimica Acta, 2015, 151(3): 378–385Google Scholar
  2. [2]
    Jegal J P, Kim K B. Carbon Nanotube-embedding LiFePO4 as a Cathode Material for High Rate Lithium Ion Batteries[J]. Journal of Power Sources, 2013, 243(6): 859–864CrossRefGoogle Scholar
  3. [3]
    Xiang W, Tang Y, Wang Y Y, et al. Influence of pH Value and Chelating Reagent on Performance of Li3V2(PO4)3/C Cathode Material[J]. Transactions of Nonferrous Metals Society of China, 2013, 23(5): 1 395–1 402CrossRefGoogle Scholar
  4. [4]
    Yang C C, Jang J H, Jiang J R. Study of Electrochemical Performances of Lithium Titanium Oxide Coated LiFePO4/C Cathode Composite at Low and High Temperatures [J]. Applied Energy, 2016, 162: 1 419–1 427CrossRefGoogle Scholar
  5. [5]
    Oh S W, Myung S T, Oh S M, et al. Polyvinylpyrrolidone-assisted Synthesis of Microscale C-LiFePO with High Tap Density as Positive Electrode Materials for Lithium Batteries[J]. Electrochimica Acta, 2010, 55(3): 1 193–1 199CrossRefGoogle Scholar
  6. [6]
    Zhong M E, Zhou Z T. Preparation of High Tap-density LiFePO4/C Composite Cathode Materials by Carbothermal Reduction Method Using Two Kinds of Fe3+ Precursors[J]. Materials Chemistry & Physics, 2010, 119(3): 428–431CrossRefGoogle Scholar
  7. [7]
    Tang H, Tan L, Jun X U. Synthesis and Characterization of LiFePO4 Coating with Aluminum Doped Zinc Oxide[J]. Transactions of Nonferrous Metals Society of China, 2013, 23(2): 451–455CrossRefGoogle Scholar
  8. [8]
    Paul N, Wandt J, Seidlmayer S, et al. Aging Behavior of Lithium Iron Phosphate Based 18650-type Cells Studied by In Situ, Neutron Diffraction[J]. Journal of Power Sources, 2017, 345: 85–96CrossRefGoogle Scholar
  9. [9]
    Ktepe H, Sahan H, Lgen A, et al. Synthesis and Electrochemical Properties of Carbon-Mixed LiEr0.0 2Fe0.98PO4 Cathode Material for Lithium-ion Batteries[J]. Journal of Materials Science & Technology, 2011, 27(9): 861–864CrossRefGoogle Scholar
  10. [10]
    Liu H Liu, Liu Y Y, An L W, et al. High Energy Density LiFePO4/C Cathode Material Synthesized by Wet Ball Milling Combined with Spray Drying Method [J]. Journal of the Electrochemical Society, 2017, 164(14): A3 666–A3 672CrossRefGoogle Scholar
  11. [11]
    Wang J, Sun X. Understanding and Recent Development of Carbon Coating on LiFePO4 Cathode Materials for Lithium-ion Batteries[J]. Energy & Environmental Science, 2012, 5(1): 5 163–5 185CrossRefGoogle Scholar
  12. [12]
    Wang J, Yang J, Yong Z, et al. Interaction of Carbon Coating on LiFePO4: A Local Visualization Study of the Influence of Impurity Phases[J]. Advanced Functional Materials, 2013, 23(7): 806–814CrossRefGoogle Scholar
  13. [13]
    Dominko R, Bele M, Gaberscek M, et al. Porous Olivine Composites Synthesized by Sol-gel Technique[J]. Journal of Power Sources, 2006, 153(2): 274–280CrossRefGoogle Scholar
  14. [14]
    Doeff M M, Wilcox J D, Yu R, et al. Impact of Carbon Structure and Morphology on the Electrochemical Performance of LiFePO4/C Composites[J]. Journal of Solid State Electrochemistry, 2008, 12 (7–8): 995–1 001CrossRefGoogle Scholar
  15. [15]
    Wang W Q, Hao J J, Guo Z M, et al. A Simple Hydrothermal Process Based on FePO4•2H2O to Synthesize Spherical LiFePO4/C Cathode Material[J]. Advanced Materials Research, 2012(476–478): 4Google Scholar
  16. [16]
    Zhou J, Shen X, Jing M, et al. Synthesis and Electrochemical Performances of Spherical LiFePO4, Cathode Materials for Li-ion Batteries[J]. Rare Metals, 2006, 25(6): 19–24CrossRefGoogle Scholar
  17. [17]
    Yang C C, Jang J H, Jiang J R. Comparison Electrochemical Performances of Spherical LiFePO4/C Cathode Materials at Low and High Temperatures [J]. Energy Procedia, 2014, 61: 1 402–1 409CrossRefGoogle Scholar
  18. [18]
    Li W, Hwang J, Chang W, et al. Ultrathin and Uniform Carbonlayer-coated Hierarchically Porous LiFePO4 Microspheres and Their Electrochemical Performance[J]. Journal of Supercritical Fluids, 2016, 116: 164–171CrossRefGoogle Scholar
  19. [19]
    Chen Z, Zhao Q, Xu M, et al. Electrochemical Properties of Self-assembled Porous Micro-spherical LiFePO4/PAS Composite Prepared by Spray-drying Method[J]. Electrochimica Acta, 2015, 186: 117–124CrossRefGoogle Scholar
  20. [20]
    Wei W, Chen D, Wang R, et al. Hierarchical LiFePO4/C Microspheres with High Tap Density Assembled by Nanosheets as Cathode Materials for High-performance Li-ion Batteries[J]. Nanotechnology, 2012, 23(47): 475 401CrossRefGoogle Scholar
  21. [21]
    Fey T K, Lin Y C, Kao H M. Characterization and Electrochemical Properties of High Tap-density LiFePO4/C Cathode Materials by a Combination of Carbothermal Reduction and Molten Salt Methods[J]. Electrochimica Acta, 2012, 80(10): 41–49CrossRefGoogle Scholar
  22. [22]
    Liu Y Y, Liu H, An L W, et al. Blended Spherical Lithium Iron Phosphate Cathodes for High Energy Density Lithium-ion Batteries[J]. Ionics, 2018: 1–9Google Scholar
  23. [23]
    Liu Y, Zhang M, Li Y, et al. Nano-sized LiFePO4/C Composite with Core-shell Structure as Cathode Material for Lithium Ion Battery[J]. Electrochimica Acta, 2015, 176: 689–693CrossRefGoogle Scholar
  24. [24]
    Wu B, Ren Y, Mu D, et al. Lithium Insertion/Desertion Properties of LiFePO4 Cathode in a Low Temperature Electrolyte Modified with Sodium Chloride Additive[J]. Solid State Ionics, 2014, 260(3): 8–14CrossRefGoogle Scholar
  25. [25]
    Rui X H, Yesibolati N, Chen C H. Li3V2(PO4)3/C Composite as an Intercalation-type Anode Material for Lithium-ion Batteries[J]. Journal of Power Sources, 2011, 196(4): 2 279–2 282CrossRefGoogle Scholar

Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2019

Authors and Affiliations

  • Yuanyuan Liu (刘远远)
    • 1
  • Hao Liu
    • 1
  • Xinxin Zhao
    • 1
  • Li Wang
    • 1
    • 2
  • Guangchuan Liang (梁广川)
    • 1
    • 2
    • 3
    Email author
  1. 1.Institute of Power Source and Ecomaterials ScienceHebei University of TechnologyTianjinChina
  2. 2.Key Laboratory of Special Functional Materials for Ecological Environment and InformationMinistry of EducationTianjinChina
  3. 3.Key Laboratory for New Type of Functional Materials in Hebei ProvinceHebei University of TechnologyTianjinChina

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