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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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Metallic Solids02:37

Metallic Solids

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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....
18.4K
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...
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相关实验视频

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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固体电解质双模粒粒结构,改善循环性能

Zhanhui Jia1, Hao Shen1, Jiawei Kou1

  • 1Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.

Advanced materials (Deerfield Beach, Fla.)
|January 23, 2024
PubMed
概括
此摘要是机器生成的。

在固态电解质中使用双模粒微结构的新"绕道和缓冲"策略可以防止树短路. 这使得电池的电流密度更高,性能更好.

关键词:
在LLZO固态电解质中.树突抑制树突抑制双模微观结构的双模微观结构骑自行车表现的表现绕道和缓冲效应的影响.

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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:

  • 树状石的形成会导致固态电解质的短路,从而限制电池的性能.
  • 控制陶电解质中的粒径大小和孔隙分布,如Li$_{7}$La$_{3}$Zr$_{2}$O$_{12}$对于缓解树的生长至关重要.

研究的目的:

  • 提出和验证固态电解质的"绕道和缓冲"战略.
  • 通过结合粗粒和细粒来优化微观结构以提高电池性能.

主要方法:

  • 通过播种未粉碎的颗粒来制造粗细双模粒微观结构.
  • 调颗粒和孔隙通过不同的粉末比重重新排列.
  • 尸检后的分析证实了"绕道和缓冲"机制.

主要成果:

  • 实现了优化的双模微结构 (粗粉和细粉的均混合物).
  • 优化的电解质在增加电流密度 (1.0到2.0mA·cm$^{-2}$) 的情况下循环超过2000小时.
  • 细粒制造了复杂的边界,阻碍了Li的透;粗粒增加了Li路径的曲率.

结论:

  • "绕道和缓冲"策略有效地抑制了多晶固态电解质中的树突.
  • 微结构优化是提高固态电池性能和安全性的关键.