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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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. 
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

24.0K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.0K
Metallic Solids02:37

Metallic Solids

18.5K
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....
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Periodic Classification of the Elements04:00

Periodic Classification of the Elements

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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
45.6K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.2K
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...
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2 GeS3:具有前所未有的结构类型的离子导体.

Jihun Roh1, Namgyu Do1, Alicia Manjón-Sanz2

  • 1Department of Energy Science and Engineering, DGIST (Daegu Gyeongbuk Institute of Science and Technology), Daegu 42988, Republic of Korea.

Inorganic chemistry
|September 22, 2023
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概括

研究人员发现了Li2GeS3的新晶体结构,Li2GeS3是一种用于更安全的全固态电池 (ASSB) 的固体电解质. 这一发现促进了为下一代储能解决方案开发高性能离子导体的发展.

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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:

  • 离子电池 (LIB) 由于易燃的液体电解质而面临安全挑战.
  • 全固态电池 (ASSB) 通过使用固体电解质来提高安全性.
  • 自从最初的报告以来,Li2GeS3的晶体结构,一种潜在的固体电解质,仍然不太清楚.

研究的目的:

  • 为了阐明Li2GeS3.3的详细晶体结构.
  • 研究Li2GeS3.3中的离子导电性和扩散通路.
  • 评估Li2GeS3作为ASSB的离子导体的潜力.

主要方法:

  • 通过Li2S和GeS2.2.的固态反应合成Li2GeS3.
  • 使用粉末X射线和飞行时间中子衍射数据进行ab initio结构确定.
  • 在不同温度下测量离子导电性.
  • 用于扩散路径分析的债券价值能景观计算.

主要成果:

  • 对Li2GeS3.3的新型六角晶体结构 (空间组 *P*61 ) 的发现.
  • 该结构具有扭曲的六角形密集的硫离子排列,其中Li和Ge位于四面体位点.
  • 测量的离子导电值在303 K的1.63 × 10−8 S cm−1到383 K的2.45 × 10−7 S cm−1之间.
  • 计算揭示了三维扩散路径.

结论:

  • 揭露的Li2GeS3的晶体结构为其离子导电特性提供了基本的见解.
  • 在所有固态电池中,Li2GeS3具有作为离子导体的潜力.
  • 这种新的结构为通过化学修饰开发先进的离子导体提供了机会.