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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...
14.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.1K
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...
17.1K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.8K
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:
23.8K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.4K
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. 
41.4K
The Born-Haber Cycle02:44

The Born-Haber Cycle

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Lattice Energy 
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Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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基于LaCl3的化固体电解质具有高离子导电性,用于全固态电池.

Chengyu Fu1, Yifan Li2, Wenjie Xu3,4

  • 1School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China.

Nature communications
|May 21, 2024
PubMed
概括

一个新的基于LaCl3的导体 (Na1-xZrxLa1-xCl4) 显示出对固态电池的高离子导电性和稳定性. 这种材料可以在全固态电池中实现高性能,这对于下一代能源存储至关重要.

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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:

  • 高性能全固态电池需要具有出色的离子导电性,可压缩性和氧化稳定的阴极体.
  • 目前对阴解材料的限制阻碍了固态储能器件的效率和寿命.

研究的目的:

  • 合成和表征一种基于LaCl3的Na+超离子导体,用于作为全固态电池中的催解质.
  • 研究合成材料的结构和离子传输特性及其对电池性能的影响.

主要方法:

  • 固态反应与材料合成的机械化学方法相结合.
  • 用于结构分析的X射线衍射 (XRD).
  • 第一个原则的计算和X射线吸收细结构 (XAFS) 了解离子导电机制.

主要成果:

  • 一个六边形Na1-xZrxLa1-xCl4相,具有高离子导电性 (2.9 × 10-4 S cm-1在30°C) 和高氧化潜力 (3.80 V对Na2Sn) 已成功准备.
  • Na+ 离子沿 c 轴形成一维的扩散通道,导电性受到通道大小和 Na+/La3+ 混合的影响.
  • 使用这种材料作为催解体的全固态电池的初始容量为114 mAh g-1 ,在70个周期内在0.3°C下保持88%的容量.

结论:

  • 合成的基于LaCl3的Na+超离子导体对高性能全固态电池具有有前途的性能.
  • 材料的结构和离子运输机制是明确的,为进一步优化提供了途径.
  • 证明的电池性能表明了这种材料在实际储能应用中的潜力.