通过界面B-O复合来稳定晶格氧,用于4.6V LiCoO2 阴极.
Jimin Qiu1, Yuchen Ji1, Wenfang Li2
1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
ACS nano
|September 16, 2025
概括
高压氧化阴极使用B-O复合策略进行稳定. 这种方法可以防止氧气损失和溶解,提高电池的性能和稳定性.
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:
- 氧化 (LiCoO2) 阴极在高电压 (>4.5V) 时表现出结构不稳定性.
- 这种不稳定性涉及相位过渡,溶解和界面反应,与不稳定的表面氧相关.
研究的目的:
- 在4.6V时稳定LiCoO2的表面晶格氧.
- 为了减轻结构降解和提高高压LiCoO2阴极的电化学性能.
主要方法:
- 一种使用三 (pentafluorophenyl) 电解质添加剂的界面B-O复合策略.
- 现场和现场表征技术具有时间和空间分辨率.
主要成果:
- 这种B-O复杂化策略有效地稳定了表面晶格氧,通过抑制类似过氧的物种 (O2^2-).
- 氧气损失和界面副作用反应显著减缓,从而保留了的化学环境.
- 阶段过渡和协调结构的变化被抑制,改善了容量保留和速率性能.
结论:
- 接口B-O复合策略成功稳定了高压LiCoO2阴极.
- 这种方法为提高先进离子电池的耐用性和效率提供了一条途径.
相关概念视频
Ionic Bonding and Electron Transfer
48.7K
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.
48.7K
Complexation Equilibria: Factors Influencing Stability of Complexes
802
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
802
Trends in Lattice Energy: Ion Size and Charge
26.5K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
26.5K
Crystal Field Theory - Octahedral Complexes
30.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.6K


