Effects of Mg doping on the remarkably enhanced electrochemical performance of Na3V2(PO4)3 cathode materials for sodium ion batteries

  • Li H
  • Yu X
  • Bai Y
 et al. 
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Na3V2-xMgx(PO4)3/C composites with different Mg2+ doping contents (x = 0{,} 0.01{,} 0.03{,} 0.05{,} 0.07 and 0.1) were prepared by a facile sol-gel method. The doping effects on the crystal structure were investigated by XRD{,} XPS and EXAFS. The results show that low dose doping of Mg2+ does not alter the structure of the material{,} and magnesium is successfully substituted for the vanadium site. The Mg doped Na3V2-xMgx(PO4)3/C composites exhibit significant improvements on the electrochemical performance in terms of the rate capability and cycle performance{,} especially for the Na3V1.95Mg0.05(PO4)3/C. For example{,} when the current density increased from 1 C to 30 C{,} the specific capacity only decreased from 112.5 mA h g-1 to 94.2 mA h g-1 showing very good rate capability. Moreover{,} even cycling at a high rate of 20 C{,} an excellent capacity retention of 81% is maintained from the initial value of 106.4 mA h g-1 to 86.2 mA h g-1 at the 50th cycle. Enhanced rate capability and cycle performance can be attributed to the optimized particle size{,} structural stability and enhanced ionic and electronic conductivity induced by Mg doping.

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  • Hui Li

  • Xiqian Yu

  • Ying Bai

  • Feng Wu

  • Chuan Wu

  • Liang-yu Liu

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