Enhanced electrode kinetics and electrochemical properties of low-cost NaFe_(2)PO_(4)(SO_(4))_(2)via Ca~(2+)doping as cathode material for sodium-ion batteries  

作　　者：Shao-Fang Li Zhen-Yi Gu Jin-Zhi Guo Xian-Kun Hou Xu Yang Bo Zhao Xing-Long Wu 

机构地区：[1]National fy Local United Engineering Laboratory for Power Batteries,Faculty of Chemistry,Northeast Normal University,Changchun,130024,China [2]Key Laboratory for UV Light-Emitting Materials and Technology,Northeast Normal University,Ministry of Education,Changchun,130024,China

出　　处：《Journal of Materials Science & Technology》2021年第19期176-182,共7页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(No.91963118);the Science Technology Program of Jilin Province(No.20200201066JC);the“13th Five-Year”Science and Technology Research from the Education Department of Jilin Province(No.JJKH20201179KJ);the 111 Project(No.B13013)。

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 Na Fe_(2)PO_(4)(SO_(4))_(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 Ca^(2+)doping.Na_(0.84)Ca_(0.08)Fe_(2)PO_(4)(SO_(4))_(2)have achieved considerable electrochemical properties.The first discharge specific capacity is 121.6 m A h g^(-1)at 25 m A g^(-1)with the voltage platform(-3.1 V)corresponding to Fe^(2+/3+).After 100 cycles,the capacity retention is 55.1%.The excellent electrochemical performance is caused by some Na^(+)is substituted by Ca^(2+)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)cm^(2)s^(-1)).

关 键 词：NaFe_(2)PO_(4)(SO_(4))_(2) Na-super-ionic conductor Sodium-ion batteries Cathode Ca~(2+)doping 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]