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相关概念视频

Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
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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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Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
943
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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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...
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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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突破极限:最大限度地提高硫化固态电池的能量密度

Chanho Kim1, Yuanshun Li1,2, Inyoung Jang3

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.

Advanced materials (Deerfield Beach, Fla.)
|May 27, 2025
PubMed
概括

我们开发了一个超过400Wh的固态电池 (SSB) 架构,接近.

关键词:
通过NMC涂层进行NMC涂层.所有固态电池都是固态电池.高能量密度,高能量密度.叶片类型的电解质电解质.硫化物电解质的电解质是硫化物.

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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:

  • 阳极为下一代电池提供了高的理论容量.
  • 固态电解质 (SSEs) 与液态电解质相比,承诺提高安全性和能量密度.
  • 在实现基于的固态电池 (SSB) 的高能量密度和长期稳定性方面仍然存在挑战.

研究的目的:

  • 为了展示一种新的固态电池 (SSB) 架构,实现高能量密度 (>400Wh kg-1).
  • 优化关键电池组件 (微Si阳极,NMC811阴极,SSE) 的加工技术.
  • 调查和解决能力衰减机制,以改善长期稳定性.

主要方法:

  • 使用99.9%重量的微Si阳极,薄硫化物固体电解质 (SSE) 和高负载NMC811阴极制造SSB架构.
  • 评估用于电极和SSE制造的湿和干加工技术.
  • 在25°C下进行电化学循环试验,以评估容量保持和循环寿命.
  • 尸体解剖后分析以确定降解机制.

主要成果:

  • 实现了>400 Wh kg-1的能量密度,接近基SSB的理论极限.
  • 经过1000多个周期的演示,约80%的容量保留为2 mAh cm-2.
  • 在500个循环中实现了94%的容量保留,为3 mAh cm-2.
  • 确定了NMC/SSE接口氧化和NMC结构破坏作为主要衰变机制.

结论:

  • 过度将纳入主体对于匹配正极容量至关重要.
  • 电极表现出强大的固体电解质间相 (SEI),有助于稳定性.
  • 改善NMC涂层,晶格氧气稳定和阴极-电解质接口是SSB长期稳定性的必要条件.