等结构
阴极
材料科学
离子
离子键合
晶体结构
快离子导体
离子电导率
扩散
锂(药物)
结晶学
化学工程
物理化学
化学
电极
热力学
电解质
有机化学
物理
医学
内分泌学
工程类
作者
Xiaochen Ge,Huihui Liang,Chaohong Guan,Xu Wang,J. F. Li,Yanqing Lai,Zhian Zhang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-12-29
卷期号:18 (2): 1714-1723
被引量:1
标识
DOI:10.1021/acsnano.3c10319
摘要
Superior sodium-ion batteries (SIBs) greatly need cathode materials with higher capacity and better durability. Herein, the anion group substitution strategy is proposed to design a cathode material with extraordinary Na+ storage performance, NASICON-Na4Fe3(PO4)1.9(SiO4)0.1P2O7 (NFPP-Si0.1). The experimental and theoretical research revealed that modification in the local structure by anion substitution significantly boosts the ionic/electronic transfer kinetics via optimizing the electronic conductivity and reducing the Na+ diffusion energy barrier. Furthermore, the SiO44- substitution generates a slight expansion of the crystal lattice to broaden the Na+ diffusion channel. Specifically, the custom-designed NFPP-Si0.1 could deliver a high rate capability of 77.6 mAh g-1 at constant 50 C charge-discharge and excellent recyclability of 79.4% retention rate after 7000 cycles at 10 C. Besides, it also possesses outstanding low temperature reversible capacity of 95.5 mAh g-1 at 0.1 C and long-term cyclability of 93.6% capacity retention after 1000 cycles at 5 C in -10 °C. This strategy of heterogeneous and isostructural anion group substitution provides a method for unlocking high-rate and long-life-span mixed polyanionic cathodes.
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