在P2型中的插入效应Na2/3Ni1/3Mn2/3O2
Carlos Pérez-Vicente1, Rafaela Ariza1, Wenhua Zuo2
1Department of Inorganic Chemistry and Chemical Engineering, University Research Institute for Energy and Environment (IQUEMA), University of Córdoba, Campus of Rabanales, Marie Curie Building, Córdoba, 14071, Spain.
Small (Weinheim an der Bergstrasse, Germany)
|October 16, 2023
概括
使用P2-Na2/3Ni1/3Mn2/3O2阴极的离子细胞表现出独特的机制,抑制/空位排序和Jahn-Teller效应. 这为先进的电池材料设计提供了新的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 固态化学 固态化学
背景情况:
- 层层的过渡金属氧化物是充电电池的有希望的阴极材料.
- 作为离子电池阴极,P2-Na2/3Ni1/3Mn2/3O2已被探索,显示了/空位的排序和Mn3+的形成.
- 离子电池具有更高的理论能量密度,但在阴极材料开发方面面临着挑战.
研究的目的:
- 为了研究P2-Na2/3Ni1/3Mn2/3O2作为离子电池中的阴极的反应机制.
- 分析插入和提取过程中的结构和化学变化.
- 将性能和机制与其离子对应物进行比较.
主要方法:
- 在离子电池中的P2-Na2/3Ni1/3Mn2/3O2阴极在不同的电压范围内 (4.50.15V和3.90.15V对Mg2+/Mg) 的电化学循环.
- 使用超细胞模型进行结构和化学变化的分析 (例如,Mg1/6Na1/3Ni1/3Mn2/3O2,Mg1/12Na1/2Ni1/3Mn2/3O2).
- 调查多阶段放电形状和价值变化 (Ni2+/Ni3+).
主要成果:
- 离子插入抑制了/空位排序和Jahn-Teller效应,与离子细胞不同.
- 离子电池表现出一个多步排放配置,达到~100mAhg-1与Ni3+到Ni2+的价值变化.
- 观察到的性能和机制与离子对应物显著不同,离子对应物具有更高的容量,但受到排序和Mn3+的存在的影响.
结论:
- P2-Na2/3Ni1/3Mn2/3O2阴极在Mg离子细胞中展示了一个新的反应机制.
- 与相比,的插入导致不同的结构模型 ("分阶段"",中间"",平均").
- 这些发现为改善Mg离子电池的阴极材料结构工程提供了洞察力.
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