在丰富的多层阴极中稳定格子氧气,由多诱导的定效应
Ruian Fan1, Luwei Shi1, Shenfei Zhao2
1School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
The journal of physical chemistry letters
|August 8, 2025
概括
间歇性兴奋剂通过稳定氧氧还原反应来增强丰富的Mn基层氧化物阴极. 这一策略提高了循环稳定性,并减轻了先进电池应用的不可逆转的氧气释放.
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
- 固态化学 固态化学
背景情况:
- 富的基层氧化物 (LRMLOs) 为下一代电池提供高特异性容量和能量密度.
- 氧离子氧化还原反应的缓慢动力学和不良可逆性阻碍了LRMLOs的实际应用.
研究的目的:
- 作为一种提高LRMLOs电化学性能的策略,研究间歇性兴奋剂的疗效.
- 为了稳定氧氧还氧反应并提高LRMLO阴极的循环能力.
主要方法:
- 使用间歇性兴奋剂将B原子引入LRMLO结构,形成BO4协调.
- 使用多尺度表征技术来分析结构和电子变化.
- 进行了电化学评估和密度功能理论 (DFT) 计算,以评估性能和机制.
主要成果:
- 兴奋剂创造了强大的BO4结构,增强了B-O共价性,减少了氧Bader电荷,增加了氧空隙形成能量.
- 电化学测试显示,与未使用兴奋剂的样本相比,容量保留有19.3%的改善 (63.6%在0.05°C的50个循环后).
- DFT的计算证实,合体将O2p频段中心向下移动,并降低平均氧气Bader电荷,减轻氧气释放.
结论:
- 间歇性兴奋剂有效地抑制氧过氧化,稳定LRMLOs中的氧子晶状体.
- 这种原子级工程方法显著提高了LRMLO阴极的循环性和电化学稳定性.
- 该研究提出了一种可行的策略,用于在LRMLO材料中实现高活性和稳定的氧氧回氧,用于先进的能量存储.
相关概念视频
02:48Ionic Bonding and Electron Transfer
42.2K
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.
42.2K
02:54Trends in Lattice Energy: Ion Size and Charge
24.2K
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:
24.2K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
471
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...
471
02:51Metal-Ligand Bonds
21.5K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.5K
02:42Ionic Crystal Structures
14.7K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.7K
02:44The Born-Haber Cycle
22.2K
Lattice Energy
22.2K