相关实验视频

Updated: Jul 8, 2025

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

一个过化Li₁₊Mn₂O₄阴极的稳定晶体框架,用于高性能微型电池的异界面长轴菌株

Jie Zheng¹, Rui Xia¹, Sourav Baiju²

¹University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500AE Enschede, The Netherlands.

|December 13, 2023

概括

微型电池的过化氧化阴极实现稳定的高容量. 在SrRuO3上进行的Epitaxial应变工程可以防止相位过渡,将容量翻一番并提高循环稳定性.

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:

高能量和高功率密度的离子微电池需要先进的正极材料.
过化Li1+xMn2O4 (LMO) 提供了高的理论容量,但遭受不可逆转的相位转换和容量退化.
微电池允许独特的薄膜修改策略,这种策略在传统电池中是不可行的.

研究的目的:

为了稳定微型电池的过化LMO阴极的螺旋晶体框架.
通过异界面格子应变来提高LMO阴极的容量和循环稳定性.
调查表生长对LMO阶段过渡和表现的影响.

主要方法:

在SrRuO3 (SRO) 电子导体层上LMO的长轴薄膜生长.
异界面格子变异及其对LMO晶体结构的影响.
密度函数理论 (DFT) 建模,以了解过度化过程中的应力适应.
电化学测试用于评估容量,循环稳定性和相位过渡可逆性.

主要成果:

在LMO/SRO异质接口上的格子不合适会诱导平面内表轴约束,在过度化过程中抑制平面内格子扩张.
DFT建模证实,表轴约束适应内部格子应力,防止不可逆转的立方四角形相位过渡.
由于第二个离子的可逆间歇和完整的可逆相位过渡,实现了双倍的容量.
显示出出色的循环稳定性,分别为4V和3V范围的容量保留>90.3%和77.4%.

结论:

通过表轴生长的异界面晶格菌株是稳定过度化LMO阴极的有效策略.
这种方法可以实现完全可逆的相位过渡,显著提高容量和循环性能.
开发的LMO表轴阴极对高性能微电池应用具有前景.

关键词:

经轴稳定器的表轴稳定器雅恩 - 泰勒扭曲的扭曲离子微型电池是一种离子微型电池.过度化1+xMn2O4 的情况.斯宾尼尔阴极是如何使用的薄膜薄膜是一种薄膜.

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

Construction and Testing of Coin Cells of Lithium Ion Batteries

Construction and Testing of Coin Cells of Lithium Ion Batteries

Published on: August 2, 2012

相关概念视频

Ionic Crystal Structures

Ionic Crystal Structures

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...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

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...

Batteries and Fuel Cells

Batteries and Fuel Cells

A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

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.