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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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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在阳极固态电池中的断裂动力学

Douglas Lars Nelson1, Stephanie E Sandoval1, Jaechan Pyo2

  • 1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

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带有阳极的固态电池显示出更高能量密度的前景. 这项研究揭示了在循环过程中阳极破裂如何导致退化,为更耐用的电池设计提供了见解.

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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
  • 电池技术 电池技术

背景情况:

  • 固态电池 (SSB) 与传统的离子电池相比,提供了更高的安全性和能量密度.
  • 阳极对高容量储能充满希望,但在循环过程中会出现显著的体积变化.
  • 在SSB中阳极的化学-机械降解机制仍然不太清楚.

研究的目的:

  • 研究固态电池中阳极的微观至宏观化学机械降解过程.
  • 为了阐明阳极和固体电解质接口内的裂的形成和冲击.
  • 为下一代电池设计更有弹性的电极提供见解.

主要方法:

  • 使用*operando*X射线计算微图学来实时可视化降解.
  • 采用连续相场损伤建模来量化应力分布和断裂.
  • 在/固体电解质接口和阳极内部分析了裂纹形成.

主要成果:

  • 在阳极上观察到泥类型通道裂的形成,这是由于脱过程中的双轴拉伸应力造成的.
  • 鉴定了不同大小的域之间的局部反应竞争导致的有害界面裂.
  • 量化压力驱动的通道裂纹及其在界面骨折中的关键作用,与化应力状态相关.

结论:

  • 这项研究揭示了SSB中阳极特有的关键化学机械降解机制.
  • 界面裂纹受局部应力状态和域大小变化的影响.
  • 这些发现为设计用于高能固态电池的坚固电极提供了必要的指导方针.