Volume 7 Issue 4
Aug.  2022
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Mei-Yi Wang, Xin-Xin Zhao, Jin-Zhi Guo, Xue-Jiao Nie, Zhen-Yi Gu, Xu Yang, Xing-Long Wu. Enhanced electrode kinetics and properties via anionic regulation in polyanionic Na3+xV2(PO4)3-x(P2O7)x cathode material. Green Energy&Environment, 2022, 7(4): 763-771. doi: 10.1016/j.gee.2020.11.026
Citation: Mei-Yi Wang, Xin-Xin Zhao, Jin-Zhi Guo, Xue-Jiao Nie, Zhen-Yi Gu, Xu Yang, Xing-Long Wu. Enhanced electrode kinetics and properties via anionic regulation in polyanionic Na3+xV2(PO4)3-x(P2O7)x cathode material. Green Energy&Environment, 2022, 7(4): 763-771. doi: 10.1016/j.gee.2020.11.026

Enhanced electrode kinetics and properties via anionic regulation in polyanionic Na3+xV2(PO4)3-x(P2O7)x cathode material

doi: 10.1016/j.gee.2020.11.026
  • Mixing polyanion cathode materials are promising candidates for the development of next-generation batteries, owing to their structural robustness and low-volume changes, yet low conductivity of polyanion hinders their practical capacity. Herein, the anion-site regulation is proposed to elevate the electrode kinetics and properties of polyanionic cathode. Multivalent anion P2O74- is selected to substitute the PO43- in Na3V2(PO4)3 (NVP) lattice and regulate the ratio of polyanion groups to prepare Na3+xV2(PO4)3-x(P2O7)x (NVPPx, 0 ≤ x ≤ 0.15) materials. The optimal Na3.1V2(PO4)2.9(P2O7)0.1 (NVPP0.1) material can deliver remarkably elevated specific capacity (104 mAh g-1 at 0.1 C, 60 mAh g-1 at 20 C, respectively), which is higher than those of NVP. Moreover, NVPP0.1 exhibits outstanding cyclic stability (91% capacity retention after 300 cycles at 1 C). Experimental analyses reveal that the regulation of anions improves the structure stability, increases the active Na occupancy in the lattice and accelerates the Na+ migration kinetics. The strategy of anion-site regulation provides the researchers a reference for the design of new high-performance polyanionic materials.

     

  • The equally contributed authors.
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