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相关概念视频

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

861
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
861
Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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聚合物电子屏蔽层使全固态电池能够进行优质的树突抑制.

Yiqi Wei1,2, Zhenglong Li1, Zichong Chen2

  • 1Institute of Science and Technology for New Energy, Xi'an Technological University, Xi'an 710021, China.

ACS nano
|February 9, 2024
PubMed
概括

在玻利化物 (LiBH4) 颗粒上,有一种新的柔性屏蔽层,可以防止树石的形成,并提高离子导电性. 这一突破提高了固态电池的性能和安全性,使得操作温度范围更广.

关键词:
所有固态电池都是固态电池.压制树,抑制树.电子屏蔽 电子屏蔽 电子屏蔽聚甲基酸) 是一种聚甲基酸.固态化物电解质 固态化物电解质

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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
  • 固态电池 固态电池是什么

背景情况:

  • 博化物 (LiBH4) 是固态电池的一个有前途的材料.
  • 关键的挑战包括室温低的离子导电性,树岩的形成和狭窄的电压窗口.
  • 这些局限性阻碍了基于LiBH4的电池的实际应用.

研究的目的:

  • 为了解决固态电池中LiBH4的局限性.
  • 在LiBH4颗粒上制造出灵活的聚合物电子屏蔽层.
  • 为了提高离子导电性,抑制树的生长,并提高电池性能.

主要方法:

  • 在LiBH4粒子表面上制造柔性聚合物电子屏蔽层.
  • 测量电子导电性,对于树成长的临界电偏差和离子导电.
  • 评估循环稳定性,临界电流密度和操作温度窗口.

主要成果:

  • 在25°C时,LiBH4的电子导电率降低了两个数量级,为1.15 × 10−9 S cm−1.
  • 观察到,对于树生长的临界电偏差增加了68倍.
  • 实现了快速的离子导电,高临界电流密度 (11.43 mA cm-2),以及5000小时循环稳定性 (5.70 mA cm-2).
  • 证明了 -30150 °C的广泛的操作温度窗口.

结论:

  • 电子屏蔽层有效地抑制了LiBH4.4中的树突形成.
  • 经过修改的LiBH4显示了增强的离子导电性和更好的电池性能.
  • 这种方法为开发高性能,安全的化物固态电解质用于电池提供了有前途的战略.