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相关概念视频

Batteries and Fuel Cells03:12

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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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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
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A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
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相关实验视频

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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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完全固态电池的接口设计

Hongli Wan1, Zeyi Wang1, Weiran Zhang2

  • 1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA.

Nature
|October 25, 2023
PubMed
概括
此摘要是机器生成的。

固态金属电池的新介质可以防止树脂的生长,并降低电阻. 这使得高能量密度和快速充电,即使在低堆压力.

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科学领域:

  • 材料科学
  • 电化学
  • 能量储存

背景情况:

  • 高能全固态金属电池面临的挑战是树的生长和在低堆压力下高的界面阻力.
  • 这些问题阻碍了电池的性能和安全性,限制了它们的实际应用.

研究的目的:

  • 设计阳极和阴极的新型中间层,以克服全固态金属电池的低堆压操作的局限性.
  • 通过抑制树突形成和降低界面电阻来提高金属电池的稳定性和性能.

主要方法:

  • 为Li/Li6PS5Cl接口开发了一种Mg16Bi84中间层,以抑制树的生长.
  • 将富含的中间层应用于LiNi0.8Mn0.1Co0.1O2 (NMC811) 阴极,以降低界面电阻.
  • 在涂层剥离周期期间进行现场结构和化学分析,以了解层间机制.

主要成果:

  • Mg16Bi84间层转化为多功能LiMgSx-Li3Bi-LiMg结构,作为固体电解质间相,多孔Li3Bi亚层和固体粘合剂.
  • 在循环过程中,Li3Bi子层促进了的均沉积和应力缓解.
  • 富含的中间层通过形成F-doped NMC811稳定了NMC811,使其在4.3V下运行.
  • NMC811/Li6PS5Cl/Li电池在2.55 mA cm-2下达到7.2 mAh cm-2,而LiNiO2/Li6PS5Cl/Li电池在2.5 MPa堆压力下达到11.1 mAh cm-2,能量密度为310 Wh kg-1.

结论:

  • 开发的阳极和阴极间层为增强全固态金属电池提供了总体策略.
  • 这种方法可以在低堆压条件下实现高能量密度和快速充电能力.
  • 这项研究为下一代先进的电池技术提供了有希望的解决方案.