Comparison of electrochemical performances of olivine NaFePO4 in sodium-ion batteries and olivine LiFePO 4 in lithium-ion batteries

  • Zhu Y
  • Xu Y
  • Liu Y
 et al. 
  • 81

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Abstract

Carbon-coated olivine NaFePO4 (C-NaFePO4) spherical particles with a uniform diameter of ?80 nm are obtained by chemical delithiation and subsequent electrochemical sodiation of carbon-coated olivine LiFePO4 (C-LiFePO4), which is synthesized by a solvothermal method. The C-NaFePO4 electrodes are identical (particle size, particle size distribution, surface coating, and active material loading, etc.)to C-LiFePO4 except that Li ions in C-LiFePO4 are replaced by Na ions, making them ideal for comparison of thermodynamics and kinetics between C-NaFePO4 cathode in sodium-ion (Na-ion) batteries and C-LiFePO4 in lithium-ion (Li-ion) batteries. In this paper, the equilibrium potentials, reaction resistances, and diffusion coefficient of Na in C-NaFePO4 are systematically investigated by using the galvanostatic intermittent titration technique (GITT), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), and compared to those of the well-known LiFePO4 cathodes in Li-ion batteries. Due to the lower diffusion coefficient of Na-ion and higher contact and charge transfer resistances in NaFePO4 cathodes, the rate performance of C-NaFePO4 in Na-ion batteries is much worse than that of C-LiFePO4 in Li-ion batteries. However, the cycling stability of C-NaFePO4 is almost comparable to C-LiFePO4 by retaining 90% of its capacity even after 100 charge–discharge cycles at a charge–discharge rate of 0.1 C

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Authors

  • Yujie Zhu

  • Yunhua Xu

  • Yihang Liu

  • Chao Luo

  • Chunsheng Wang

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