材料科学
杂原子
纳米片
钒
阴极
阳极
兴奋剂
电化学
钠离子电池
纳米技术
化学工程
电导率
电极
光电子学
化学
冶金
法拉第效率
物理化学
有机化学
工程类
戒指(化学)
作者
Wei Li,Zhujun Yao,Yu Liu,Shengzhao Zhang,Xiuli Wang,Xinhui Xia,C.D. Gu,J.P. Tu
标识
DOI:10.1016/j.cej.2021.133557
摘要
Sodium vanadium fluorophosphate has been extensively explored for the cathode of sodium ion batteries (SIBs), which is known for its high voltage platform, three-dimensional framework structure and minor volume deformation. However, low intrinsic electronic conductivity restricts its practical charge/discharge performances. Accelerating the electron/ion transport process of sodium vanadium fluorophosphate is the vital point to realize high performances of SIBs. Herein, a well-designed nitrogen doped three-dimensional (3D) nanosheet flower-like Na3V2(PO4)2F2.5O0.5 composite (N-NVPFO) is proposed by optimizing nanostructure plus heteroatom doping. The 3D flower-like structure of N-NVPFO provides a great deal of active sites and guarantees the structure stability. In addition, the N-doping in Na3V2(PO4)2F2.5O0.5 bulk phase could enhance the intrinsic electronic conductivity by narrowing the energy gap, which is confirmed through the density functional theoretical (DFT) calculation. The N-NVPFO electrode delivers excellent rate capability (84 mAh g−1 at 10C) and long cycling life (86% capacity retention up to 2000 cycles). Furthermore, the quasi-solid-state SIBs using NaTi2(PO4)3 anode also exhibits good electrochemical performances.
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