电化学
阴极
扩散
快离子导体
循环伏安法
兴奋剂
电化学动力学
材料科学
动力学
电极
离子
化学工程
分析化学(期刊)
无机化学
化学
电解质
物理化学
光电子学
热力学
色谱法
物理
量子力学
工程类
有机化学
作者
Fangjie Ji,Kean Chen,Fumin Li,Along Zhao,Yongjin Fang,Yuliang Cao
标识
DOI:10.1016/j.ensm.2024.103371
摘要
Na3MnTi(PO4)3 is one of the most promising cathode candidates for sodium-ion batteries owing to its low cost, high operating voltage, and large reversible capacity. However, its electrochemical performance is significantly impeded by its deteriorative structure and sluggish Na+ diffusion kinetics. Herein, Cr-doping is introduced to tailor the structure of Na3MnTi(PO4)3, which helps to lengthen the Na2-O bond and expand the Na ion diffusion channels. X-ray diffraction, cyclic voltammetry, galvanostatic intermittent titration technique, and first principle calculations confirm the broadened diffusion channel for Na+ and facilitated Na+ diffusion rate after Cr-doping. As a result, the Na3.1MnTi0.9Cr0.1(PO4)3 electrode exhibits superior electrochemical performance with high discharge capacity (167.5 mAh g−1 at 0.1 C), outstanding rate capability (127.5 mAh g−1 at 10 C), and remarkable cyclability (70.56% retention after 1400 cycles at 5 C). We believe that the results are useful for the design of high-performance NASICON-structured cathode materials for practical sodium-ion batteries.
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