NaF-M(M=Fe,Cu)钠离子电池转换正极材料的研究

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 as Conversion Cathode Materials for Sodium Ion Batteries

NaF-M(M = Fe,Cu) nanocomposites were prepared by high-energy ball milling using TiN grinding nanoparticles and investigated as cathode materials for sodium ion batteries.The experimental results demonstrated 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 conversion 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 materials for sodium ion batteries.