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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:
24.1K

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用于超离子导电的变形三化物

Weijin Zhang1, Jirong Cui1,2, Shangshang Wang1,2

  • 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China.

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|April 5, 2023
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概括
此摘要是机器生成的。

研究人员开发了一种用于储存清洁能源的新材料. 通过使用纳米粒度和缺陷的化 (LaHx) 进行工程,他们获得了具有高离子导电性的超离子导体,从而实现了室温固态化细胞.

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科学领域:

  • 材料科学
  • 电化学
  • 能量储存

背景情况:

  • 化物离子 (H−) 是一种反应性物种和能量载体,具有强大的可还原性和高氧化还原潜力.
  • 导导纯的材料对于清洁的能量储存和电化学转换至关重要.
  • 稀土三化物提供快速的H-迁移,但具有有害的电子导电性.

研究的目的:

  • 在稀土三水化物中抑制电子导电性.
  • 在环境条件下开发一种允许纯离子导电的材料.
  • 展示一个功能完整的固态体细胞.

主要方法:

  • 用纳米粒和格子缺陷合成化物 (LaHx).
  • 测量离子和电子导电.
  • 制造和测试一个室温全固态化物电池.

主要成果:

  • 电子导电能力被抑制了五个数量级.
  • 在 - 40°C 达到超离子导体状态.
  • 记录高的H-导电性为1.0 × 10−2 S cm−1的低扩散屏障为0.12 eV.

结论:

  • 工程LaHx显示显著降低电子导电性和增强的离子导电性.
  • 这一突破使得先进的清洁能源储存技术的发展成为可能.
  • 一个功能性的室温全固态化物电池已成功演示.