在没有离子导体的碳接口上,金属通过Coble Creep向多孔结构的入
Eunseo Han1, Yunsun Cho1, Yuju Jeon1
1School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, South Korea.
Small (Weinheim an der Bergstrasse, Germany)
|September 10, 2025
概括
订制半孔石墨碳 (OMGC) 框架使全固态电池 (ASSB) 中的稳定金属阳极成为可能. 这种方法最大限度地减少了接口问题,并允许控制的增长,为零体积变化ASSB铺平了道路.
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:
- 使用硫化物电解质和金属阳极的全固态电池 (ASSB) 面临电解质化学脆弱性和树石透的挑战.
- 金属阳极与固体电解质之间的接口对于电池的性能和安全至关重要.
研究的目的:
- 解决金属阳极在ASSB中的化学脆弱性和物理透问题.
- 调查使用有序半孔石墨碳 (OMGC) 框架来稳定金属阳极接口.
主要方法:
- 在硫化物固体电解质和铜电流收集器之间加入一个OMGC框架.
- 分析涂/剥离行为以及Coble在OMGC结构中的角色.
- 评估ASSB使用OMGC稳定金属阳极的性能.
主要成果:
- OMGC框架成功地将电流收集器和固体电解质之间的化学脆弱接口 (CVI) 降到最低.
- 进入OMGC框架是通过Coble creep,一种扩散变形机制来促进的.
- 金属完全占据了OMGC框架的空白体积,使电池能够稳定地运行,无需单独的离子通路或型电池.
结论:
- OMGC框架为稳定ASSB中的金属阳极提供了一个可行的策略.
- 拟议的OMGC化,化和Coble creep的机制表明了开发零体积变化ASSB的潜力.
- 这项研究为推进下一代固态电池的安全性和性能提供了有希望的途径.
相关概念视频
01:24Metal-Semiconductor Junctions
913
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
913
02:54Trends 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
01:15Charging Conductors By Induction
9.0K
The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
9.0K
01:17Theory of Metallic Conduction
1.7K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.7K
02:54Molecular and Ionic Solids
19.9K
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...
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...
19.9K
02:48Ionic Bonding and Electron Transfer
48.8K
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.
48.8K