揭示了矿固体电解质中局部环境和离子运输的相互作用
Junghwa Kim1,2, Kiarash Gordiz2, Daniele Vivona3
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, United States.
ACS nano
|November 1, 2024
概括
固体电解质中的增加减少了瓶大小,增强了离子导电性. 这项研究通过特定的瓶量化离子扩散,指导先进的氧化物固体电解质的设计.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 电化学 电化学 电化学
背景情况:
- 固态离子导电对于储能技术至关重要.
- 固体中的离子扩散通常受到结构瓶的限制.
- 了解这些瓶是设计高效固体电解质的关键.
研究的目的:
- 为了研究 (La) 占用率和瓶大小在Li$_{0.5}$La$_{0.5}$TiO$_{3}$之间的关系.
- 通过特定的瓶区域量化离子 (Li$^{+}$) 扩散性.
- 阐明当地的化学和结构对离子运输的影响.
主要方法:
- 偏差校正扫描传输电子显微镜 (STEM) 和多切片电子图谱用于直接观察.
- 基于分子动力学 (MD) 的方法量化Li$^{+}$扩散性.
- 在原子学模拟中进行的无弹性弹性带 (NEB) 计算.
主要成果:
- 增加的La占用率与减少的瓶大小相关,在Li$_{0.5}$La$_{0.5}$TiO$_{3}$.
- 较小的瓶,受LA占用的影响,影响Li$^{+}$导电性方向性和维度.
- 较大的瓶大小与较小的局部迁移障碍和更高的局部扩散度相关.
结论:
- 当地化学和格子结构直接影响Li$^{+}$离子运输.
- 瓶大小是决定固体电解质中的离子导电性的关键因素.
- 这项研究为设计用于电池和其他应用的改进氧化物固体电解质提供了洞察力.
更多相关视频
11:38Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
18.4K
08:12Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
9.5K
相关概念视频
01:17Pore Transport and Ion-Pair Transport
375
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
375
01:19Ionic Strength: Effects on Chemical Equilibria
1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.4K
02:54Molecular and Ionic Solids
16.9K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
16.9K
01:17Ion Exchange
555
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
555
03:45Formation of Complex Ions
23.4K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.4K
02:21Electrolyte and Nonelectrolyte Solutions
62.3K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
62.3K