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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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. 
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相关实验视频

Updated: Jul 13, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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酸盐基人工固体电解质间相使金属阳极稳定.

Menghao Li1,2, Xuming Yang3, Duojie Wu2,4

  • 1School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

ACS applied materials & interfaces
|October 13, 2023
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种基于酸盐的人工固体电解质介相 (B-SEI) 来稳定金属阳极. 这种新的B-SEI层有效地抑制了树突的生长,提高了电池的安全性和性能,用于下一代储能.

关键词:
低温电子显微镜的低温电子显微镜.充满金属电池 的电池.玻酸酸是一种酸.金属阳极是一种金属阳极.固体-电解质相间阶段

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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
  • 电池技术 电池技术

背景情况:

  • (Li) 金属阳极对于高能量密度电池至关重要.
  • 树突的形成和界面的不稳定性阻碍了金属阳极的实际应用.
  • 现有的固体电解质介面 (SEI) 往往缺乏稳定性和均的离子传输.

研究的目的:

  • 为金属阳极开发一种基于酸盐的新型人工固体电解质接相 (B-SEI).
  • 调查B-SEI的结构和特性.
  • 评估由B-SEI保护的金属阳极的电化学性能和稳定性.

主要方法:

  • 通过金属Li与三乙烯胺 (TEAB) 的反应合成B-SEI.
  • 使用低温电子显微镜 (Cryo-EM) 描述了B-SEI结构.
  • 使用对称Li细胞和LiFePO4//Li全细胞评估电化学性能.

主要成果:

  • 在B-SEI展出了玻璃晶双层结构.
  • 人工SEI促进了均的离子运输,并抑制了树的生长.
  • 带有B-SEI的对称Li细胞在3 mA cm-2.2下维持了700小时的稳定循环.
  • 在500个循环后,全细胞表现出最小的容量衰变.

结论:

  • 基于酸盐的人工SEI有效地稳定了金属阳极.
  • 这种方法提高了金属电池的速率性能和周期寿命.
  • 开发的B-SEI代表了对实用的高能金属电池的有希望的战略.