揭示了导向富层氧化物的稳定机制
Wen Yang1,2, Xiaomu Zhu3, Zeng Zeng4
1Institute for Advanced Study, Chengdu University, Chengdu 610106, P. R. China.
ACS applied materials & interfaces
|August 23, 2024
概括
与多晶结构相比,单晶丰富的分层阴极在离子电池中表现出优越的热稳定性. 这是由于氧气空缺减少和多晶材料在粒边界的异构缩.
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
- 电池技术 电池技术
背景情况:
- 富含的层状氧化物对于高能离子电池至关重要.
- 了解晶体结构对性能的影响至关重要.
- 结构对热稳定的影响背后的机制尚不清楚.
研究的目的:
- 研究单晶与多晶结构对LiNi0.83Co0.12Mn0.05O2阴极的影响.
- 阐明电化学性能和热稳定性差异的潜在机制.
- 为设计改进的阴极材料提供见解.
主要方法:
- 通过受控化和后处理制备多晶和单晶LiNi0.83Co0.12Mn0.05O2.
- 系统地比较电化学性能和热稳定性.
- 氧气空缺的分析和Ni的减少行为.
主要成果:
- 单晶阴极表现出增强的热稳定性.
- 多晶阴极显示氧气空缺的异构扩散和Ni的减少.
- 结构上的差异显著影响电池性能和安全性.
结论:
- 单晶结构在富含Ni的阴极中提供了卓越的热稳定性.
- 颗粒边界特征在材料异质性中起着至关重要的作用.
- 这项研究澄清了先进离子电池单晶阴极增强稳定的起源.
相关概念视频
Metallic Solids
18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K
Complexation Equilibria: Factors Influencing Stability of Complexes
348
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
348
Ionic Crystal Structures
14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
Properties of Transition Metals
25.3K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
25.3K


