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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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Valence Bond Theory02:42

Valence Bond Theory

11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.1K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

26.1K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
26.1K
Formation of Complex Ions03:45

Formation of Complex Ions

25.6K
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...
25.6K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.9K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.0K
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 the dxy,...
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相关实验视频

Updated: Jan 10, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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调节空位和局部协调结构 实现稳定的基于的NASICON阴极

Nan Zhang1,2, Han Zhang1,2, Jiaxuan Liu1,2

  • 1State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.

Angewandte Chemie (International ed. in English)
|November 26, 2025
PubMed
概括

铁兴奋剂通过减少缺陷和减轻结构扭曲来稳定离子电池的Na3MnTi(PO4) 3阴极. 这提高了性能,为高能耗,持久的电池提供了有前途的途径.

关键词:
杰恩·泰勒效应是什么?当地协调地方协调Na3MnTi ((PO4) 3) 是一种的化合物.在的空缺位置.电压歇斯底里存在电压歇斯底里.

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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:

  • 纳西康型Na3MnTi(PO4) 3 (NMTP) 阴极为离子电池提供低成本和高容量.
  • 电压歇斯底里和结构降解限制NMTP阴极性能.

研究的目的:

  • 通过空位和局部协调合策略,增强NMTP阴极稳定性和电化学性能.
  • 通过低价值离子兴奋剂来抑制内在抗体缺陷 (IASD) 和Jahn-Teller扭曲.

主要方法:

  • 在NMTP网格中引入了Fe2+兴奋剂,产生了Na3+2xMnTi1-xFex(PO4)3.3.
  • 使用DFT计算,现场XANES和ssNMR分析来研究协同机制.
  • 评估电化学性能,包括特定容量,速率能力和循环稳定性.

主要成果:

  • 2+兴奋剂降低了Na空位度,并激活了Na2位点,抑制了IASDs.
  • 重建的Mn-O协调增强了MnO6对称性,减轻了Jahn-Teller扭曲.
  • 优化Na3.2MnTi0.9Fe0.1(PO4)3表现出高容量 (174.2mAhg-1在0.1°C),优异的速率能力 (125.5mAhg-1在20°C),和稳定的循环 (85%的保留2000个循环后).

结论:

  • 减少空隙度和稳定MnO6对称性的协同机制有效地抑制电压歇斯底里和Jahn-Teller扭曲.
  • 2+兴奋剂为设计高能量密度,寿命长的离子电池提供了可行的策略.
  • 这项工作为先进电池材料的空缺和协调工程提供了洞察力.