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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

19.7K
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...
19.7K
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

39
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
39
Ionic Association01:28

Ionic Association

46
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
46
Ion Exchange01:17

Ion Exchange

1.5K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.5K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.6K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.6K
The Electrical Double Layer01:30

The Electrical Double Layer

97
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
97

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Updated: Mar 13, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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晶体/无形接口工程用于高级离子存储.

Jie Sheng1, Yang Li2, Shaoyu Chai1

  • 1School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China.

ACS applied materials & interfaces
|March 12, 2026
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种用于离子电池 (SIB) 的新型晶体/形态异质连接,可以减少接口应力. 这种方法显著提高了电池容量和循环稳定性,为先进的SIB铺平了道路.

关键词:
无形的硫化硫化.晶体瓦纳四素化物结晶/形态的异质连接.接口 接口 互动 互动离子电池 离子电池

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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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:

  • 在离子电池 (SIB) 中的晶体/晶体异质连接显示出希望,但由于不匹配的膨胀系数而遭受界面应力.
  • 这种压力导致裂纹和降解,限制容量和循环耐用性.

研究的目的:

  • 开发一种晶体/形态 (C/A) 异质连接策略,以减轻SIB中的界面压力.
  • 通过改善Na+扩散和稳定性来提高SIB的电化学性能.

主要方法:

  • 使用晶体VS4和无形COS制造C/A异质连接.
  • 使用理论计算来理解Na+扩散动力学和界面应力调制.
  • 在SIB中对材料进行电化学测试,包括速度能力和长期循环稳定性测试.
  • 用Na3V2(PO4) 3阴极组装和测试一个全细胞.

主要成果:

  • C / A 异质连接有效地减少了界面应力,改善了 Na + 扩散动力学.
  • 合成材料在100个循环以1.0 A g-1的速度以最小的容量衰变实现了700.25 mAh g-1的高可逆特异性容量.
  • 经过1200个循环后,表现出了出色的速率能力 (481.4 mAh g-1 在20 A g-1 时) 和长期循环稳定性.
  • 在5.0A g-1.0的11000个循环后,全细胞保持了90.8%的容量.

结论:

  • C/A异构连接是克服SIB界面应力限制的可行策略.
  • 这种方法显著提高了Na+储存能力,速率能力和循环耐用性.
  • 这项研究为设计下一代异质连接材料用于高性能SIB提供了一条新的途径.