相关实验视频

Updated: Jun 22, 2026

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

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

Published on: November 11, 2013

对吸附缺陷的X射线光谱研究在多孔碳上对吸附缺陷的贡献

Yuliya V Fedoseeva¹, Elena V Shlyakhova¹, Anna A Makarova²

¹Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 3 Acad. Lavrentiev Ave., Novosibirsk 630090, Russia.

Nanomaterials (Basel, Switzerland)

|October 14, 2023

概括

多孔碳纳米材料的结构缺陷增强了吸附,并提高了离子电池的性能. 引入石墨烯网格缺陷可以提高碳基电极中的储能.

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
表面科学是一门学科.

背景情况:

具有高表面积的多孔碳 (PCs) 对电化学能量存储具有前景.
电脑上的吸附对电池性能至关重要,主要是由电容性行为驱动的.
了解和碳在原子水平上的相互作用是优化存储的关键.

研究的目的:

研究石墨烯网格中的结构缺陷对结合的影响.
为了将电子结构的变化与吸附和储存能力相关联.
为了证明多孔碳中的缺陷工程如何提高离子电池的性能.

主要方法:

对表面敏感的X射线光电子光谱 (XPS) 和近边缘X射线吸收细结构 (NEXAFS) 光谱被用于分析电子状态.
进行密度函数理论 (DFT) 计算以了解结合相互作用.
使用离子电池的电化学研究与成长和回火的多孔碳电极进行了比较.

主要成果:

石墨烯层中的缺陷促进了和碳的π*轨道之间的dative相互作用.
缺陷的石墨烯结构提供更短的Li-C距离和更强的轨道重叠,增强电荷转移.
化多孔碳以修复缺陷减少了吸附和表面含量.
随着长大的有缺陷的多孔碳,与化样品相比,离子电池容量更高.

结论:

石墨烯层中的结构缺陷显著影响结合特性,并增强储存.
在多孔碳纳米材料中的工程缺陷可以改善吸附和电化学能量储存.
这项研究为设计高性能离子电池的先进碳电极提供了途径.

关键词:

在 DFT 方面,它是最重要的.这是NEXAFS.这是XPSXPS.的吸附方式是吸附.离子电池是一种离子电池.有孔的碳是多孔的碳

更多相关视频

$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$ 11:25

In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries

Published on: November 10, 2014

Failure Analysis of Batteries Using Synchrotron-based Hard X-ray Microtomography

Failure Analysis of Batteries Using Synchrotron-based Hard X-ray Microtomography

Published on: August 26, 2015

相关概念视频

Imperfections in Crystal Structure: Stoichiometric Point Defects

Imperfections in Crystal Structure: Stoichiometric Point Defects

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...

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...