相关实验视频

Updated: Jul 17, 2025

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

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

Published on: November 10, 2014

在Na₃V₂ (PO₄) 中化/脱过程中的结构演变的原子尺度调查 - 基于全固态电池

Fang-Chun Shen¹, Qianli Ma², Frank Tietz²

¹Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|September 6, 2023

概括

所有固态电池使用Na3V2(PO4) 3阴极. 一个中间Na2V2(PO4) 3相增强结构稳定性和离子动力学,提高电池性能.

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
固态化学固态化学

背景情况:

全固态电池 (Na-ASSB) 提供了更高的安全性和能量密度.
由于其高容量和稳定性,使用NASICON结构的Na3V2(PO4)3 (Na3VP) 阴极的Na-ASSB显示出有希望的结果.
这些阴极内的详细的电化学动力学仍然在很大程度上未被阐明.

研究的目的:

在原子层面研究 Na3VP 阴极的化/脱机制.
了解Na3VP在电化学性能中的中间阶段的作用.
阐明Na3VP在循环过程中的动力学和结构演变.

主要方法:

现场高分辨率传输电子显微镜 (HRTEM) 用于观察动态结构变化.
密度函数理论 (DFT) 计算分析离子迁移和形成能量.
在循环后分析体积变化和电极-电解质接口.

主要成果:

在化/脱过程中,在原子尺度上观察到中间的Na2V2(PO4) 3 (Na2VP) 阶段.
发现Na2VP阶段可以减少晶格不匹配,防止结构崩并提高稳定性.
DFT计算显示,Na2VP结构中的Na+离子迁移速度更快,增强了动力学.
Na2VP阶段的形成降低了NaVP的形成能量,进一步稳定了结构.

结论:

Na3VP结构的动态演变包括形成一个关键的Na2VP中间阶段.
这个中间阶段对于缓解结构崩和增强离子运输动力学至关重要.
这些发现为先进的储能应用提供了对电极材料行为的基本见解.

关键词:

Na2V2(PO4) 3 3 的情况.Na3V2(PO4) 3 3 的使用情况.这是一个全固态的全固态系统.在原子尺度上.动态进化的动态演变.在现场的TEM.

更多相关视频

Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy

Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy

Published on: January 20, 2023

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

相关概念视频

Molecular and Ionic Solids

Molecular and Ionic Solids

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...

Voltaic/Galvanic Cells

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...