材料科学
电化学
阴极
循环伏安法
兴奋剂
电极
钠
化学工程
动力学
热扩散率
离子
钠离子电池
无机化学
电化学动力学
分析化学(期刊)
锂(药物)
物理化学
冶金
化学
热力学
光电子学
法拉第效率
色谱法
内分泌学
工程类
有机化学
物理
医学
量子力学
作者
Shaofang Li,Zhen‐Yi Gu,Jin‐Zhi Guo,Xian-Kun Hou,Xu Yang,Bo Zhao,Xing‐Long Wu
标识
DOI:10.1016/j.jmst.2020.10.047
摘要
In recent years, sodium-ion batteries (SIBs) have been considered as one of the most promising alternatives to lithium-ion batteries (LIBs). Here, a new Na-super-ionic conductor (NASICON) cathode material NaFe2PO4(SO4)2 is successfully prepared through solid state method for SIBs. While the poor electronic conductivity of iron-based materials results in its poor rate and cycle performance. Then the electrochemical is effectively promoting via Ca2+ doping. Na0.84Ca0.08Fe2PO4(SO4)2 have achieved considerable electrochemical properties. The first discharge specific capacity is 121.6 mA h g−1 at 25 mA g−1 with the voltage platform (∼3.1 V) corresponding to Fe2+/3+. After 100 cycles, the capacity retention is 55.1 %. The excellent electrochemical performance is caused by some Na+ is substituted by Ca2+ and leading to the fast sodium kinetics, which is well proved by the powder X-ray diffraction pattern and well corresponding to the galvanostatic intermittent titration technique and cyclic voltammetry testing result (the diffusivity values are around at 10−12 cm2 s−1).
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