在Li4SiO4-Li3PO4固体电解质中对快速离子导电的结构和机制洞察力
Yue Deng1,2, Christopher Eames2, Jean-Noël Chotard1
1†Laboratoire de Réactivité et Chimie des Solides (UMR CNRS 7314), Université de Picardie Jules Verne, 33 rue Saint Leu, 80039 Amiens Cedex, France.
Journal of the American Chemical Society
|June 30, 2015
概括
研究人员通过混合Li4SiO4和Li3PO4.4开发了一种用于可充电电池的新型固体电解质. 这种新材料具有显著增强的离子导电性,有望生产更安全,更持久的电池.
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:
- 可充电电池需要安全的,持久的,具有高离子导电性的固体电解质.
- 目前的固体电解质在平衡化学稳定性和导电性方面面临着挑战.
研究的目的:
- 通过研究离子导电系统 (1-z) Li4SiO4- ((z) Li3PO4.4) 来开发具有增强离子导电性的固体电解质.
- 了解混合组合中的离子导电背后的机制.
主要方法:
- 多技术方法包括X射线和中子衍射,交流阻抗光谱,大规模分子动力学 (MD) 模拟和固态NMR实验.
- 在各种组合中对上层结构和不混合性特征的表征 (z = 0.0-1.0).
主要成果:
- 在高纯度样本中确定了以前未知的上层结构和不混合性特征.
- 在混合组合中,在573K时达到10(-3) S/cm的离子导电率,比母相高出数量级.
- MD模拟显示了离子导电的3D路径和合作间歇机制.
结论:
- 与母相相比,Li4SiO4-Li3PO4的混合化合物表现出明显增强的离子导电性.
- 通过3D路径的相关离子运动对于高离子导电性至关重要.
- 获得的见解将指导下一代固体电解质的开发,以提高电池性能.
更多相关视频
相关概念视频
Weak Acid Solutions
45.9K
Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
45.9K
Theory of Strong Electrolytes
109
The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
109
Ionic Bonding and Electron Transfer
54.4K
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.
54.4K
Molecular and Ionic Solids
20.9K
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...
20.9K
The Electrical Double Layer
176
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
176
Formation of Complex Ions
26.8K
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...
26.8K


