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Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

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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Updated: Dec 23, 2025

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

Published on: September 12, 2018

结构和接口设计可实现稳定丰富的阴极

Chunyu Cui¹, Xiulin Fan², Xiuquan Zhou³

¹Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States.

Journal of the American Chemical Society

|April 23, 2020

概括

此摘要是机器生成的。

一个新的O2结构阴极和化电解质组合提高了离子电池的性能. 这种设计提高了高能耗应用的初始库伦比效率和循环稳定性.

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相关实验视频

Last Updated: Dec 23, 2025

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

Published on: September 12, 2018

Development of Efficient OLEDs from Solution Deposition

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Published on: November 4, 2022

Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

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Published on: March 7, 2018

科学领域:

材料科学
电化学
能量储存

背景情况:

丰富的多层氧化物正极为离子电池提供了高的理论能量密度.
由于氧气释放和金属迁移,O3结构的阴极面临着初始库伦比效率低,电压衰减和稳定性差等挑战.

研究的目的:

克服O3结构的阴极在丰富的层氧化物中的局限性.
提高高能离子电池的稳定性和性能.

主要方法:

使用稳定的O2结构Li$_{1.2}$Ni$_{0.13}$Co$_{0.13}$Mn$_{0.54}$O$_{2}$ (O2-LR-NCM) 阴极材料.
使用全的电解质.
研究了化阴极电解质间相 (CEI) 的现场形成.

主要成果:

O2-LR-NCM结构有效地限制了过渡金属的迁移.
化CEI抑制了结构转变和氧气释放,保护了过渡金属的氧化还原对.
实现高初始库伦比效率99.82%,循环效率>99.9%,可逆容量278 mAh/g,在100个循环后保持83.3%.

结论:

具有O2结构的阴极和全的电解质的协同设计显著提高了富层氧化物的稳定性和电化学性能.
这种方法为开发下一代高能离子电池提供了有前途的战略.