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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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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,...
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Electrical Conductivity01:13

Electrical Conductivity

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In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Resistivity01:22

Resistivity

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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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基于电子/离子导电的MoS6复合材料用于全固态电池.

Junjie Jia1,2, Yangyang Zhou2,3, Yuxia Ma2

  • 1School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, People's Republic of China.

ACS applied materials & interfaces
|May 1, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种全固态电池 (ASSLB) 的新阴极材料 (MoS6-10%rGO@15%Li7P3S11). 这种材料在先进的电池应用中显著提高了能量密度和循环稳定性.

关键词:
基于MoS6的复合材料全固态电池是完全固态的电池.电化学性能 电化学性能 电化学性能电子/离子导电性 电子/离子导电性高能量密度,高能量密度.

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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:

  • 全固态电池 (ASSLB) 中的过渡金属聚硫化物阴极具有高容量,但电导率和体积膨胀不佳.
  • 解决这些局限性对于实现ASSLB的潜力至关重要.

研究的目的:

  • 为ASSLBs开发一种新的阴极材料,可以克服导电性和体积膨胀的挑战.
  • 提高ASSLBs的能量密度和循环稳定性.

主要方法:

  • 一个复合性阴极材料的合成:MoS6-10%rGO@15%Li7P3S11.
  • 加入减少的氧化石墨烯 (rGO) 来改善电子导电性和减轻体积变化.
  • 在现场涂层Li7P3S11固体电解质以增强离子导电性和接口接触.

主要成果:

  • 复合阴极显著提高了电子导电性 (0.28 S cm-1) 和离子导电性 (8.4 × 10-4 S cm-1).
  • ASSLBs的初始放电容量为1111.97mAhg-1并实现了1750.94Whkg-1的超高可逆能量密度.
  • 证明了卓越的循环稳定性,在500个循环后在0.5 A g-1下保持729.53 mAh g-1.

结论:

  • 这种MoS6-10%rGO@15%Li7P3S11复合材料有效地解决了ASSLB中过渡金属聚硫化物阴极的挑战.
  • 这项工作为下一代ASSLBs提供了一个有前途的高能量密度活性材料.