双金属
阴极
插层(化学)
阳极
电化学
电池(电)
离子
离子键合
密度泛函理论
钒
化学
材料科学
结构稳定性
扩散
储能
无机化学
化学工程
电极
物理化学
有机化学
热力学
复合材料
冶金
计算化学
工程类
物理
功率(物理)
结构工程
作者
Qing‐Yuan Zhao,Jiang-Yu Li,Meng-Jie Chen,Hongrui Wang,Yuting Xu,Xiaofeng Wang,Xin Ma,Qing Wu,Xiongwei Wu,Xian‐Xiang Zeng
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-11-28
卷期号:22 (23): 9685-9692
被引量:1
标识
DOI:10.1021/acs.nanolett.2c03916
摘要
The practical application of Na-superionic conductor structured materials is hindered by limited energy density and structure damage upon activating the third Na+. We propose a bimetal substitution strategy with cheaper Fe and Ni elements for costive vanadium in the polyanion to improve both ionic and electronic conductivities, and a single two-phase reaction during Na+ intercalation/deintercalation and much reduced Na+ diffusion barrier are uncovered by ex-situ X-ray diffraction and density functional theory calculations. Thus, the obtained cathode, Na3Fe0.8VNi0.2(PO4)3, shows excellent electrochemical performances including high specific capacity (102.2 mAh g-1 at 0.1C), excellent rate capability (79.3 mAh g-1 at 20C), cycling stability (84.6% of capacity retention over 1400 cycles at 20C), low-temperature performance (89.7 mAh g-1 at 2C and -10 °C), and structure stability in an extended voltage window for the third Na+ utilization. A competitive energy density of ≈287 Wh kg-1 for full batteries based on cathode and anode materials is also confirmed.
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