铁掺杂氟磷酸钒钠正极材料的制备及电化学性能研究  

Preparation and electrochemical performance of iron-doped sodium vanadium fluorophosphate cathode materials

作　　者：贺鹏骁 胡国富 张硕[1] 赵翊蓉 李子信 韩曼舒 He Pengxiao;Hu Guofu;Zhang Shuo;Zhao Yirong;Li Zixin;Han Manshu(Key Laboratory of Engineering Dielectrics and Their Applications,Ministry of Education,School of Electrical Engineering,Harbin University of Science and Technology,Harbin 150080)

机构地区：[1]哈尔滨理工大学电气工程学院,工程电介质及其应用教育部重点实验室,哈尔滨150080

出　　处：《化工新型材料》2024年第S02期151-156,共6页New Chemical Materials

基　　金：中国博士后科学基金面上项目(2020M681110);哈尔滨理工大学大学生创新创业训练计划项目(校级)(X1021423012)。

摘　　要：钠离子电池作为储能领域的重要组成部分,不仅与锂离子电池工作原理相似,还表现出良好的热稳定性和较小的体积效应,具有广阔的应用前景。然而,其电子传输动力学缓慢和在电化学反应中结构易受破坏等问题极大限制了其应用。针对上述问题,采用溶胶-凝胶法制备铁掺杂Na_(3)V_(2)(PO_(4))_(2)F_(3)/C正极材料,通过调控铁掺杂浓度达到改善其电化学储能特性的目的。结果表明:在0.1C电流密度下,Na_(3)V_(2)(PO_(4))_(3)F_(3)/C的初始放电比容量为93.6mAh/g,通过对其进行铁掺杂后电化学性能得到有效提升。在0.1C电流密度下,Na_(3)V_(1.9)Fe_(0.1)(PO_(4))_(2)F_(3)/C初始放电比容量可达108.2mAh/g,经50次循环后其放电比容量为98.8mAh/g,容量保持率91.3%;在2C倍率下,其放电比容量达84.5mAh/g。因此,适当浓度的铁掺杂可有效提高材料的循环稳定性,从而达到提升电极材料性能的目的。As an important part of the energy storage field,sodium-ion batteries not only work in a similar way to lithium-ion batteries,but also show good thermal stability and small volume effect,and have broad application prospects.However,the application is greatly limited by their slow electron transport kinetics and structural degradation in electrochemical reactions.To address the above challenges,the sol-gel method was used to prepare iron-doped Na_(3)V_(2)(PO_(4))_(2)F_(3)/C cathode materials,with the goal of improving the electrochemical energy storage characteristics by regulating the concentration of iron doping.The results showed that the initial discharge specific capacity of Na_(3)V_(2)(PO_(4))_(3)F_(3)/C was 93.6mAh/g at 0.1C current density.Subsequently,the electrochemical properties of Na_(3)V_(2)(PO_(4))_(3)F_(3)/C were significantly improved by Fe-doping.At 0.1C current density,the initial discharge specific capacity of Na_(3)V_(1.9)Fe_(0.1)(PO_(4))_(2)F_(3)/C could reach 108.2mAh/g,and after 50 cycles,the discharge specific capacity was 98.8mAh/g,with a capacity retention rate of 91.3%.At a rate performance of 2C,the discharge specific capacity reached 84.5mAh/g.Therefore,appropriate concentration of Fe-doping could effectively increase the cyclic stability of the material,so as to achieve the purpose of improving the performance of the electrode material.

关 键 词：氟磷酸钒钠 铁掺杂 正极材料 钠离子电池 

分 类 号：TB3[一般工业技术—材料科学与工程]