用替代的化物固体电解质,对金属具有增强的稳定性
Priya Ganesan1,2, Mervyn Soans1,2, Musa Ali Cambaz1,2
1Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany.
ACS applied materials & interfaces
|August 1, 2023
概括
化固体电解质增强了对金属阳极的稳定性. 这种改进的界面稳定性减少了极化,为更安全的固态电池铺平了道路.
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:
- 基于化物的固体电解质提供高离子导电性和氧化稳定性.
- 它们的实际应用受到减少稳定性差以及对金属阳极的不稳定性所限制.
研究的目的:
- 通过逐渐化,提高化物固体电解质对金属阳极的稳定性.
- 研究替代Li2ZrCl6-Fx化合物的结构和电化学特性.
主要方法:
- 用替代化合物的机械化学合成 (Li2ZrCl6-Fx,0 ≤ x ≤ 1.2).
- 理论计算 (密度函数理论) 用于研究离子迁移障碍和接口特性.
- 电化学测试 (剥离和) 和外置X射线光电子光谱 (XPS) 来分析界面稳定性.
主要成果:
- 的替代引发了扭曲的局部结构,并改变了离子迁移障碍.
- 与Li2ZrCl5.5F0.5相比,Li2ZrCl6.5F0.5显示了与Li2ZrCl6.5相比,Li+迁移能量屏障的增加.
- 由于增强的界面稳定性,替代化合物在800小时循环后呈现出明显较低的极化.
结论:
- 逐渐化Li2ZrCl6有效地提高了其对金属阳极的界面稳定性.
- 形成富含的被动化介面相对增强的稳定性负责.
- 这一战略有望开发先进的固体电解质,用于更安全的金属电池.
更多相关视频
相关概念视频
Alkyl Halides
16.9K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
16.9K
Ionic Bonding and Electron Transfer
41.7K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.7K
Ionic Crystal Structures
14.4K
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...
14.4K
Halogens
18.5K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
18.5K
Complexation Equilibria: Factors Influencing Stability of Complexes
405
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...
405
Acid Halides to Alcohols: LiAlH4 Reduction
3.0K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
3.0K


