NaF-M(M=Fe,Cu)钠离子电池转换正极材料的研究  

NaF-M(M=Fe,Cu) Nanocomposites as Conversion Cathode Materials for Sodium Ion Batteries

作　　者：李婷[1] 陈重学[1] 曹余良[1] 杨汉西[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《电化学》2012年第4期291-294,共4页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.2009CB2201003)资助

摘　　要：以纳米TiN为研磨剂,采用机械球磨技术制备了NaF-M(M=Fe,Cu)纳米复合物,探索了这类复合物作为钠离子电池转换正极材料的可能性.电化学测试表明,NaF-Fe和NaF-Cu纳米复合物电极在钠离子电解液中能实现与Na+的逆向转换反应,其可逆放电容量达150 mAh·g-1以上,并具有较好的循环寿命.只要创造了适合相转变反应进行的微区结构,钠离子的转换反应也可以通过可逆的电化学转换反应实现,并从起始的富钠放电态直接充电至贫钠的荷电态.本工作为开发高容量钠离子电池正极材料提供了新途径.NaF-M （M=Fe, Cu） nanocomposites were prepared by high-energy ball milling using TiN grind- ing nanoparticles and investigated as cathode materials for sodium ion batteries. The experimental results dem-onstrated that NaF-Fe and NaF-Cu nanocomposites can go through electrochemical conversion reaction with Na ^＋ uptake or removal, delivering a reversible capacity of- 150 mAh·g^-1, even through a reversed conver-sion from initial discharged state to a charged state. These results reveal the possibility to realize a conversion reaction as long as NaF and elemental metal particles are intimately contacted to form active nanocomposites at nanodomain, which suggests a potential feasibility to use these nanocomposites as sodium-rich cathode materi-als for sodium ion batteries.

关 键 词：电化学转换反应 钠离子电池 正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动]