中间体法一步合成六氟铁酸钠正极材料及其在锂/钠离子电池中的性能  

Synthesis of sodium hexafluoroferrate through an intermediate method and its properties

作　　者：杨宏健 沈欢欢 周艳婷 沈周宁 杨欢 许稳 游依 刘万民[1] YANG Hongjian;SHEN Huanhuan;ZHOU Yanting;SHEN Zhouning;YANG Huan;XU Wen;YOU Yi;LIU Wanmin(College of Materials and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China;No.1 Middle School of Liling,Zhuzhou 412200,China)

机构地区：[1]湖南工程学院材料与化工学院,湖南湘潭411104 [2]湖南省醴陵市第一中学,湖南株洲412200

出　　处：《中国有色冶金》2023年第3期109-115,共7页China Nonferrous Metallurgy

基　　金：2021年度湖南省科技创新人才计划大学生科技创新创业项目“湖南工程学院新工科人才科技创新创业能力培养基地”(湘科计[2021]40号,项目编号:2021RC1011);湖南省自然科学基金资助项目(2021JJ30183)。

摘　　要：六氟铁酸钠具有较强的锂离子和钠离子存储能力,可作为锂/钠离子电池正极材料使用。目前,其制备方法存在工艺流程长、原料有毒有害和(或)溶解度低、材料电化学性能差等缺点。本研究采用三草酸合铁酸钠中间体法制备了六氟铁酸钠材料。研究结果表明,在氮气气氛中于700℃焙烧7 h可制备电化学性能优异的六氟铁酸钠;该材料在锂离子电池中的第2次放电比容量为229.1 mAh/g,循环100次的容量保持率为97.9%;在钠离子电池中的首次放电比容量为138 mAh/g,循环100次后的容量保持率为90%。该合成路线环境友好,工艺流程短,生产成本低,产品性能好,适合工业化生产。Sodium hexafluoroferrate can be used as a cathode material for lithium⁃ion batteries and sodium⁃ion batteries due to its strong storage capacity of lithium ions and sodium ions,with such shortages as long technological process,toxic harmful or low⁃solubility raw materials,poor electrochemical properties.Therefore,a novel method using Na_(3)Fe(C_(2)O_(4))_(3)as an intermediate is proposed to synthesize sodium hexafluoroferrate material.The results show that the material prepared at 700℃for 7 h in N_(2)atmosphere exhibits excellent electrochemical properties,with the second discharge specific capacity of 229.1 mAh/g and the capacity retention of 97.9%after 100 cycles for lithium⁃ion batteries,the first discharge specific capacity of 138 mAh/g and the capacity retention of 90%after 100 cycles for sodium⁃ion batteries.This route is fairly suitable for industrial production owing to its environmental friendliness,short technological process,low production cost and good product performance.

关 键 词：六氟铁酸钠 三草酸合铁酸钠 中间体法 锂离子电池 电化学性能 钠离子电池 正极材料 

分 类 号：TF826[冶金工程—有色金属冶金] TM912[电气工程—电力电子与电力传动]