Cu和Mg协同取代抑制钠离子电池正极材料P2-Na2/3Ni1/3Mn2/3O2的P2-O2相变

被引：0

作者：

朱志杰

申明远

吴涛

李文翠

机构：

[1] 大连理工大学化工学院

来源：

无机材料学报 | 2025年 / 40卷 / 02期

关键词：

钠离子电池; 正极材料; P2型层状氧化物; 协同取代;

D O I：

暂无

中图分类号：

TM912 [蓄电池];

学科分类号：

0808 ;

摘要：

研究钠离子电池（SIBs）对开发新能源和新储能方式具有重要意义。P2型层状氧化物Na2/3Ni1/3Mn2/3O2正极材料具有容量和工作电压较高的优点,但在高电压下发生的P2-O2不可逆相变会导致体积急剧变化,容量迅速衰减。针对这个问题,本研究采用Cu和Mg协同取代的策略,通过固相反应法合成了P2-Na0.67Ni0.18Cu0.10Mg0.05Mn0.67O2（NCMM-10-05）正极材料。结果表明,掺入Cu和Mg有效抑制了P2-O2相变,转而形成了可逆程度更高的OP4相,提高了材料结构的可逆稳定性,且电化学性能得到了显著提升。在2.00～4.35 V（vs.Na+/Na）电压窗口内NCMM-10-05初始放电容量为113 mAh·g–1,在8C(1C=100 m A·g–1)电流密度下仍有64.1 m Ah·g–1的可逆容量,在1C电流密度下循环200圈后容量保持率可以达到88.9%。本研究探讨了Cu和Mg协同取代对P2型层状氧化物结构与电化学性能的影响,并通过原位X射线衍射（XRD）分析与密度泛函理论（DFT）计算进一步探究了Cu、Mg元素在结构演变中的具体作用,为合理设计具备Na+快速传输能力和高稳定性的SIBs正极材料提供了参考。

引用

页码：184 / 198

页数：15

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