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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

48.6K
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. 
48.6K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

26.5K
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:
26.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.5K
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
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,...
48.0K

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相关实验视频

Updated: Jan 12, 2026

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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用Eu─Al─F对三位元元素进行兴奋,以达到稳定的高压LiCoO2.

Yutong Yao1, Guo Wang1, Xiaokun Zhang1

  • 1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, Sichuan, 611731, China.

Small (Weinheim an der Bergstrasse, Germany)
|November 7, 2025
PubMed
概括

研究人员为氧化 (LCO) 阴极开发了一种新的兴奋剂策略,以提高离子电池的性能. 这种方法可以提高在高电压下容量保留,这对于先进的电子设备至关重要.

关键词:
高电压的高压电源是什么电池是一种电池.氧化氧化氧化.多重兴奋剂多种兴奋剂

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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相关实验视频

Last Updated: Jan 12, 2026

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
07:24

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
11:54

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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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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:

  • 氧化 (LCO) 是离子电池的主要阴极材料.
  • 目前的LCO性能限制阻碍了用于先进电子产品的高能量密度电池的开发.
  • 增加充电电压可以提高LCO容量,但会导致降解和容量衰减.

研究的目的:

  • 为了提高LCO阴极的高压性能和循环稳定性.
  • 调查使用欧 (Eu), (Al) 和 (F) 的三位多元素兴奋剂策略.

主要方法:

  • 为LCO开发了一个三站式联合兴奋剂策略,使用Eu,Al和F元素.
  • 在4.55V的高切断电压下测试了修改后的LCO阴极.
  • 分析结构和电化学特性以评估性能和稳定性.

主要成果:

  • 采用Eu-Al-F联合剂的LCO阴极在4.55V时实现了205mAhg-1的初始放电容量.
  • 经过修改的阴极在250个循环后保持了80%以上的容量保留.
  • 兴奋剂策略有效地抑制了不可逆转的相位过渡,氧气损失和内部压力.

结论:

  • 三站点联合兴奋剂策略显著提高了高压LCO的周期稳定性.
  • 这种方法为开发具有更高能量密度和耐用性的先进离子电池提供了有前途的途径.
  • 该研究提供了关于减轻高压阴极材料降解机制的见解.