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相关概念视频

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.5K
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:
23.5K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.0K
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...
14.0K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

39.9K
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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

40.9K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
40.9K
Formation of Complex Ions03:45

Formation of Complex Ions

23.0K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.0K

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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多层相互作用减轻层阴极中的晶格应变.

Haoji Wang1, Tongchao Liu2, Hongyi Chen1

  • 1College of Chemistry and Chemical Engineering, Central South University, Changsha, China.

Nature communications
|May 12, 2025
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概括
此摘要是机器生成的。

在离子电池 (SIB) 的分层氧化物阴极中,积调节减少了结构性降解,提高了电化学性能. 这种方法减轻了格子应变,并改善了没有关键元素的循环稳定性.

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 过渡金属层氧化物是离子电池 (SIB) 的关键阴极材料,原因是它们的高能量密度和可持续性.
  • 在循环过程中由异型晶格应变造成的结构性降解限制了SIB阴极的长期性能.

研究的目的:

  • 研究调节作为层阴极的内在压力抑制策略.
  • 为了提高SIB阴极的电化学性能和结构稳定性,使用零或的高设计.

主要方法:

  • 采用多种过渡金属的高设计.
  • 硬X射线吸收光谱分析结构变化.
  • 半细胞和全细胞的电化学循环,以评估性能.

主要成果:

  • 高设计有效地抑制了TMO八面体扭曲和近表面结构解构.
  • 配置缩缓解了氧气缺陷和加强了金属连接体协调,导致限制的格子参数偏差.
  • 多电位阴极证明了改善的循环稳定性和增强的Na+扩散动力学.

结论:

  • 度调节是一种可行的策略,可以缓解SIBs的分层氧化物阴极中的散装疲劳.
  • 这种方法为为离子电池开发经济可行和耐用的分层氧化物阴极提供了一条途径.