钠离子电池正极材料NaNi0.4Fe0.2Mn0.4O2的制备与储钠性能

被引：1
|
作者：
王洪波
向燕宁
孟小吻
张志磊
机构：
[1] 河南工学院材料科学与工程学院
来源：
电池工业 | 2024年 / 28卷 / 02期
关键词：
NaNi0.4Fe0.2Mn0.4O2; 钠离子电池; 共沉淀; 正极材料; 过渡金属氧化物;
D O I：
10.19996/j.cnki.ChinBatlnd.2024.02.004
中图分类号：
TM912 [蓄电池];
学科分类号：
摘要：
钠离子电池作为可替代锂离子电池的下一代电池，具有独特优势，然而要开发出低成本、良好可逆性和长循环寿命的电极材料仍然存在许多技术难题。本文通过简单的共沉淀法合成NiⅡ0.4FeⅡ0.2MnⅡ0.4（OH）2前驱体，再在空气气氛下加入碳酸钠进行煅烧，制备得到用于钠离子电池的NaNi0.4Fe0.2Mn0.4O2正极材料。利用X射线衍射（XRD）和扫描电镜（SEM）表征材料的物相结构，结果表明制备的材料是典型的层状斜方六面体结构，部分材料呈现单晶特征。采用恒流充放电的测试方法表征材料的电化学性能。在0.1 C的电流密度下，该材料的初始充电容量可达141.9 mAh/g,放电容量为140.0 mAh/g,首次库仑效率高达98.7%。此外，在0.2 C、0.5 C、1 C、2 C和3 C的倍率下，该材料的放电比容量分别为129.5 mAh/g、112.6 mAh/g、97.8 mAh/g、82.9 mAh/g和72.8 mAh/g,且在0.5 C下循环100圈后的容量保持率约为70.0%,具有良好的倍率性和一定的循环稳定性。
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页码：66 / 71
页数：6
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