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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

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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:
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The Born-Haber Cycle02:44

The Born-Haber Cycle

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Lattice Energy 
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在基化物固体电解质中解锁快速的离子迁移.

Chao Li1, Wenshuo Zhang1, Xiaomeng Shi1

  • 1Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, 300350, P. R. China.

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概括

与晶体形式相比,准晶体化物固态电解质 (SSEs) 的离子导电性显著提高. 化物SSEs的这种改进是由于优化了缺陷,使得全固态电池更好.

关键词:
富含的丰富化缺陷是一个缺陷.金属化物是一种金属化物.稀土是一种稀土.固态电解质是一种固态电解质.

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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:

  • 化物固态电解质 (SSEs) 提供高氧化极限和金属兼容性,对于先进的电池至关重要.
  • 在化物SSEs,特别是Li2ZrF6 (LZF) 中控制离子导电性的结构-属性关系尚不清楚.
  • 晶体LZF具有较差的离子导电性,限制了其应用.

研究的目的:

  • 为了研究化物SSEs中的结构-属性关系.
  • 通过合成策略增强Li2ZrF6 (LZF) 的离子导电性.
  • 了解改良化物SSEs中改善的离子传输背后的机制.

主要方法:

  • 通过丰富的战略合成准晶体LZF.
  • 离子导电率和激活能量的表征.
  • 分析结构缺陷 (0D,1D,2D) 和它们对离子传输的影响.
  • 应用理论模型,包括载体空缺,单元细胞扭曲和缺陷理论.
  • 使用化物SSE作为阴极添加剂制造和测试全固态电池 (ASSLB).

主要成果:

  • 准晶体LZF比晶体LZF表现出一个数量级更高的离子导电性.
  • 增强的导电性与调制缺陷有关,优化载体空隙平衡和结构重排.
  • 具有x = 0.5的样本显示了最高的离子导电性和最低的激活能量.
  • 理论模型成功地解释了观察到的离子运输趋势.
  • 使用化物SSE添加剂的ASSLB在1000个循环后实现了66.83%的容量保留.

结论:

  • 调节化物SSEs中的结构缺陷是提高离子导电性的关键.
  • 准晶体结构和缺陷工程为开发高性能化物SSE提供了一个有希望的途径.
  • 研究的基于的化物SSE显示出出色的稳定性和适用于实际ASSLB应用的兼容性.