Electrochemical performance of Na4MnCr(PO4)3/C cathode affected by different transition metal dopants for sodium ion batteries

作者：Zhu, Qing^*; Wu, Jinxin; Tong, Rui; Li, Wenhao; Hu, Xiuli; Tian, Ningchen; He, Liqing; Li, Yanwei; Wang, Zhenyu

来源：Journal of Alloys and Compounds, 2023, 960: 170748.

DOI：10.1016/j.jallcom.2023.170748

• Various element doping
• Electrochemical performance
• Sodium ion batteries
• Cathode material
• Na4MnCr(PO4)3

Na4MnCr(PO4)3 (NMCP) has been considered as one kind of privileged cathodes with high energy density for sodium ion batteries (SIBs) due to three-electron redox reaction during the insertion/extraction process. Nevertheless, its practical use is restricted by its low intrinsic conductivity and serious Jahn-Teller distor-tions. Herein, a facile doping strategy was presented to address the above issues, and the effects of different kinds and quantities of transition metal dopants on electrochemical performance of NMCP were systemi-cally studied. The results reveal that Ni50-NMCP/C has the most effective doping composition, showing a discharge capacity of 143.0 mAh g-1 at 50 mA g-1 and long-term cyclic stability with capacity retention of 55.7 % at 1000 mA g-1 over 500 cycles, higher than those of the pristine NMCP (106.6 mAh g-1 at 50 mA g-1 and 38.8 % capacity retention at 1000 mA g-1). The substitution of Ni2+ for Mn2+ promotes electron con-ductivity and structural stability, rendering improved electrochemical performance. Moreover, the pro-mising electrochemical performance of Ni50-NMCP/C//HC full cell demonstrates the anode's potential for use. This study indicates a quick way to understand the effects of elemental doping on NMCP and explore novel high energy and high stability cathodes for SIBs. & COPY; 2023 Elsevier B.V.

• 单位
  桂林理工大学